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Wilken M, Muriqi A, Krusenbaum A, Nolan M, Devi A. Targeting Manganese Amidinates and ß-Ketoiminates Complexes as Precursors for Mn-Based Thin Film Vapor Deposition. Chemistry 2024:e202401275. [PMID: 38656605 DOI: 10.1002/chem.202401275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2024] [Revised: 04/23/2024] [Accepted: 04/24/2024] [Indexed: 04/26/2024]
Abstract
With a focus on Mn based organometallic compounds with suitable physico-chemical properties to serve as precursors for chemical vapor deposition (CVD) and atomic layer deposition (ALD) of Mn-containing materials, systematic synthetic approaches with ligand variation, detailed characterization, and theoretical input from density functional theory (DFT) studies are presented. A series of new homoleptic all-nitrogen and mixed oxygen/nitrogen-coordinated Mn(II) complexes bearing the acetamidinate, formamidinate, guanidinate and ß-ketoiminate ligands have been successfully synthesized for the first time. The specific choice of these ligand classes with changes in structure and coordination sphere and side chain variations result in significant structural differences whereby mononuclear and dinuclear complexes are formed. This was supported by density functional theory (DFT) studies. The compounds were thoroughly characterized by single crystal X-ray diffraction, magnetic measurements, mass spectrometry and elemental analysis. To evaluate their suitability as precursors for deposition of Mn-based materials, the thermal properties were investigated in detail. Mn(II) complexes possessing the most promising thermal properties, namely Bis(N,N´-ditertbutylformamidinato)manganese(II) (IV) and Bis(4-(isopropylamino)pent-3-en-2-onato)manganese(II) (ßIII) were used in reactivity studies with DFT to explore their interaction with oxidizing co-reactants such as oxygen and water which will guide future CVD and ALD process development.
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Affiliation(s)
- Martin Wilken
- Ruhr University Bochum, Inorganic Materials Chemistry, Universitätsstraße 150, 44801, Bochum, GERMANY
| | - Arbresha Muriqi
- Tyndall National Institute, University College Cork, Lee Maltings, T12 R5CP, Cork, IRELAND
| | - Annika Krusenbaum
- Ruhr University Bochum, Mechanochemistry, Universitätsstraße 150, 44801, Bochum, GERMANY
| | - Michael Nolan
- Tyndall National Institute, University College Cork, Lee Maltings, Cork T12 R5CP, Ireland, T12 R5CP, Cork, IRELAND
| | - Anjana Devi
- Ruhr University Bochum, Inorganic Materials Chemistry, Building NC, Room 04/162, Universitätsstr. 150, 44801, Bochum, GERMANY
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Hu Y, Gordon N, Ogg K, Kraitchman DL, Durr NJ, Surtees B. Thermal Characterization and Preclinical Feasibility Verification of an Accessible, Carbon Dioxide-Based Cryotherapy System. Bioengineering (Basel) 2024; 11:391. [PMID: 38671812 PMCID: PMC11048087 DOI: 10.3390/bioengineering11040391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/05/2024] [Accepted: 04/12/2024] [Indexed: 04/28/2024] Open
Abstract
To investigate the potential of an affordable cryotherapy device for the accessible treatment of breast cancer, the performance of a novel carbon dioxide-based device was evaluated through both benchtop testing and an in vivo canine model. This novel device was quantitatively compared to a commercial device that utilizes argon gas as the cryogen. The thermal behavior of each device was characterized through calorimetry and by measuring the temperature profiles of iceballs generated in tissue phantoms. A 45 min treatment in a tissue phantom from the carbon dioxide device produced a 1.67 ± 0.06 cm diameter lethal isotherm that was equivalent to a 7 min treatment from the commercial argon-based device, which produced a 1.53 ± 0.15 cm diameter lethal isotherm. An in vivo treatment was performed with the carbon dioxide-based device in one spontaneously occurring canine mammary mass with two standard 10 min freezes. Following cryotherapy, this mass was surgically resected and analyzed for necrosis margins via histopathology. The histopathology margin of necrosis from the in vivo treatment with the carbon dioxide device at 14 days post-cryoablation was 1.57 cm. While carbon dioxide gas has historically been considered an impractical cryogen due to its low working pressure and high boiling point, this study shows that carbon dioxide-based cryotherapy may be equivalent to conventional argon-based cryotherapy in size of the ablation zone in a standard treatment time. The feasibility of the carbon dioxide device demonstrated in this study is an important step towards bringing accessible breast cancer treatment to women in low-resource settings.
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Affiliation(s)
- Yixin Hu
- Kubanda Cryotherapy, Inc., Baltimore, MD 21211, USA; (Y.H.); (N.G.); (K.O.)
| | - Naomi Gordon
- Kubanda Cryotherapy, Inc., Baltimore, MD 21211, USA; (Y.H.); (N.G.); (K.O.)
| | - Katherine Ogg
- Kubanda Cryotherapy, Inc., Baltimore, MD 21211, USA; (Y.H.); (N.G.); (K.O.)
| | - Dara L. Kraitchman
- Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, MD 21205, USA;
| | - Nicholas J. Durr
- Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21218, USA;
| | - Bailey Surtees
- Kubanda Cryotherapy, Inc., Baltimore, MD 21211, USA; (Y.H.); (N.G.); (K.O.)
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Ballestar de las Heras R, Colom X, Cañavate J. Comparative Analysis of the Effects of Incorporating Post-Industrial Recycled LLDPE and Post-Consumer PE in Films: Macrostructural and Microstructural Perspectives in the Packaging Industry. Polymers (Basel) 2024; 16:916. [PMID: 38611174 PMCID: PMC11013796 DOI: 10.3390/polym16070916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Revised: 03/06/2024] [Accepted: 03/08/2024] [Indexed: 04/14/2024] Open
Abstract
In accordance with the Circular Economy Package of the European directive, the Spanish government compels manufacturers of plastic bags to include into their products a minimum of 70% of polyethylene (PE) waste. Following this mandate can be challenging and requires a deep knowledge of the alterations produced by the recycling in the main components of a plastic bag film: lineal low-density polyethylene (LLDPE), the LLDPE recycled post-industry, generated as waste from an industrial process (rLLDPE) and the PE recycled from post-consumer use (rPE), that has been picked up, cleaned, and reprocessed. This study provides insight in the macro and microstructural changes produced by several cycles of recycling in these materials. Specimens in the form of film for supermarket bags formed with these polymers have been subjected to several recycling sequences. The process closely mimics industrial processes. Four cycles have been applied to the samples. The evolution of mechanical properties, including tensile strength, elongation at break, and tear and impact tests, shows an obvious decrease due to degradation that is not an impediment for practical use after the four cycles of recycling according to the main specifications defined by the producer. Colorimetric measurements reveal no significant variations in the color of the films. The results of the FTIR and TGA analysis show degradation phenomena and changes in crystallinity in branching and the apparition of crosslinking that are in consonance with the mechanical data. There is also a difference between both types of recycled PE. In general, rLLDPE is more affected by the recycling than rPE. According to our findings, the limiting property would be the tearing. By comparing these values with bags available in the market, manufactured from 70-80% recycled material, we can infer that while two reprocessing cycles can lead to good results, a maximum of four cycles of recycling is advisable.
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Affiliation(s)
- Ricardo Ballestar de las Heras
- Research Department of Sphere Group Spain, P.I El Pradillo 3 C/Sphere, Parcela 9, 50690 Pedrola, Zaragoza, Spain;
- Chemical Engineering Department, Universitat Politècnica de Catalunya BarcelonaTECH, ESEIAAT, Colom 1, 08222 Terrassa, Barcelona, Spain;
| | - Xavier Colom
- Chemical Engineering Department, Universitat Politècnica de Catalunya BarcelonaTECH, ESEIAAT, Colom 1, 08222 Terrassa, Barcelona, Spain;
| | - Javier Cañavate
- Chemical Engineering Department, Universitat Politècnica de Catalunya BarcelonaTECH, ESEIAAT, Colom 1, 08222 Terrassa, Barcelona, Spain;
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4
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Kannengießer JF, Morgenstern B, Janka O, Kickelbick G. Oligo-Condensation Reactions of Silanediols with Conservation of Solid-State-Structural Features. Chemistry 2024; 30:e202303343. [PMID: 38146778 DOI: 10.1002/chem.202303343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Revised: 12/19/2023] [Accepted: 12/20/2023] [Indexed: 12/27/2023]
Abstract
Oligo- and polysiloxanes are usually prepared by condensation reactions in solvents without control of stereochemistry. Here we present a solventless thermal condensation of stable organosilanols. We investigated the condensation reactions of organosilanediols with different organic substituents, having in common at least one aromatic group. The condensation kinetics of the precursors observed by NMR spectroscopy revealed a strong dependence on temperature, time, and substitution pattern at the silicon atom. SEC measurements showed that chain length increases with increasing condensation temperature and time and lower steric demand of the substituents, which also influences the glass transition temperatures (Tg) of the resulting oligo- or polymers. X-ray diffraction studies of the crystalline silanediols and their condensation products revealed a structural correlation between the substituent location in the crystalline precursors and the formed macromolecules induced by the hydrogen bonding pattern. In certain cases, it is possible to carry out topotactic polymerization in the solid-state, which has its origin in the crystal structure.
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Affiliation(s)
- Jan-Falk Kannengießer
- Saarland University, Inorganic Solid-State Chemistry, Campus, Building C4 1, 66123, Saarbrücken, Germany
| | - Bernd Morgenstern
- Saarland University, Inorganic Solid-State Chemistry, Campus, Building C4 1, 66123, Saarbrücken, Germany
| | - Oliver Janka
- Saarland University, Inorganic Solid-State Chemistry, Campus, Building C4 1, 66123, Saarbrücken, Germany
| | - Guido Kickelbick
- Saarland University, Inorganic Solid-State Chemistry, Campus, Building C4 1, 66123, Saarbrücken, Germany
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Kimura K, Kumagai E, Fushimi E, Maruyama A. Alternative method for determining leaf CO 2 assimilation without gas exchange measurements: Performance, comparison and sensitivity analysis. Plant Cell Environ 2024; 47:992-1002. [PMID: 38098202 DOI: 10.1111/pce.14780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 11/20/2023] [Accepted: 11/27/2023] [Indexed: 12/20/2023]
Abstract
We present an alternative method to determine leaf CO2 assimilation rate (An ), eliminating the need for gas exchange measurements in proximal and remote sensing. This method combines the Farquhar-von Caemmerer-Berry photosynthesis model with mechanistic light reaction (MLR) theory and leaf energy balance (EB) analysis. The MLR theory estimates the actual electron transport rate (J) by leveraging chlorophyll fluorescence via pulse amplitude-modulated fluorometry for proximal sensing or sun-induced chlorophyll fluorescence measurements for remote sensing, along with spectral reflectance. The EB equation is used to directly estimate stomatal conductance from leaf temperature. In wheat and soybean, the MLR-EB model successfully estimated An variations, including midday depression, under various environmental and phenological conditions. Sensitivity analysis revealed that the leaf boundary layer conductance (gb ) played an equal, if not more, crucial role compared to the variables for J. This was primarily caused by the indirect influence of gb through the EB equation rather than its direct impact on convective CO2 exchange on the leaf. Although the MLR-EB model requires an accurate estimation of gb , it can potentially reduce uncertainties and enhance applicability in photosynthesis assessment when gas exchange measurements are unavailable.
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Affiliation(s)
- Kensuke Kimura
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Etsushi Kumagai
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Erina Fushimi
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
| | - Atsushi Maruyama
- Institute for Agro-Environmental Sciences, National Agriculture and Food Research Organization (NARO), Tsukuba, Japan
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Roldán JB, Cantudo A, Maldonado D, Aguilera-Pedregosa C, Moreno E, Swoboda T, Jiménez-Molinos F, Yuan Y, Zhu K, Lanza M, Muñoz Rojo M. Thermal Compact Modeling and Resistive Switching Analysis in Titanium Oxide-Based Memristors. ACS Appl Electron Mater 2024; 6:1424-1433. [PMID: 38435806 PMCID: PMC10903745 DOI: 10.1021/acsaelm.3c01727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/01/2024] [Accepted: 02/01/2024] [Indexed: 03/05/2024]
Abstract
Resistive switching devices based on the Au/Ti/TiO2/Au stack were developed. In addition to standard electrical characterization by means of I-V curves, scanning thermal microscopy was employed to localize the hot spots on the top device surface (linked to conductive nanofilaments, CNFs) and perform in-operando tracking of temperature in such spots. In this way, electrical and thermal responses can be simultaneously recorded and related to each other. In a complementary way, a model for device simulation (based on COMSOL Multiphysics) was implemented in order to link the measured temperature to simulated device temperature maps. The data obtained were employed to calculate the thermal resistance to be used in compact models, such as the Stanford model, for circuit simulation. The thermal resistance extraction technique presented in this work is based on electrical and thermal measurements instead of being indirectly supported by a single fitting of the electrical response (using just I-V curves), as usual. Besides, the set and reset voltages were calculated from the complete I-V curve resistive switching series through different automatic numerical methods to assess the device variability. The series resistance was also obtained from experimental measurements, whose value is also incorporated into a compact model enhanced version.
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Affiliation(s)
- Juan B. Roldán
- Departamento
de Electrónica y Tecnología de Computadores, Universidad de Granada, Facultad de Ciencias. Avenida Fuentenueva s/n, 18071 Granada, Spain
| | - Antonio Cantudo
- Departamento
de Electrónica y Tecnología de Computadores, Universidad de Granada, Facultad de Ciencias. Avenida Fuentenueva s/n, 18071 Granada, Spain
| | - David Maldonado
- Departamento
de Electrónica y Tecnología de Computadores, Universidad de Granada, Facultad de Ciencias. Avenida Fuentenueva s/n, 18071 Granada, Spain
- IHP-Leibniz-Institut
für innovative Mikroelektronik, 15236 Frankfurt (Oder), Germany
| | - Cristina Aguilera-Pedregosa
- Departamento
de Electrónica y Tecnología de Computadores, Universidad de Granada, Facultad de Ciencias. Avenida Fuentenueva s/n, 18071 Granada, Spain
| | - Enrique Moreno
- CEMDATIC—E.T.S.I
Telecomunicación, Universidad Politécnica
de Madrid (UPM), 28040 Madrid, Spain
| | - Timm Swoboda
- Department
of Thermal and Fluid Engineering, Faculty of Engineering Technology, University of Twente, 7500 AE Enschede, The Netherlands
| | - Francisco Jiménez-Molinos
- Departamento
de Electrónica y Tecnología de Computadores, Universidad de Granada, Facultad de Ciencias. Avenida Fuentenueva s/n, 18071 Granada, Spain
| | - Yue Yuan
- Materials
Science and Engineering Program, Physical Sciences and Engineering
Division, King Abdullah University of Science
and Technology (KAUST), Thuwal 23955-6900, Saudi
Arabia
| | - Kaichen Zhu
- MIND, Department
of Electronic and Biomedical Engineering, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain
| | - Mario Lanza
- Materials
Science and Engineering Program, Physical Sciences and Engineering
Division, King Abdullah University of Science
and Technology (KAUST), Thuwal 23955-6900, Saudi
Arabia
| | - Miguel Muñoz Rojo
- Department
of Thermal and Fluid Engineering, Faculty of Engineering Technology, University of Twente, 7500 AE Enschede, The Netherlands
- 2D
Foundry, Instituto de Ciencia de Materiales
de Madrid (ICMM), CSIC, Madrid 28049, Spain
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Abir FM, Altwarah Q, Rana MT, Shin D. Recent Advances in Molten Salt-Based Nanofluids as Thermal Energy Storage in Concentrated Solar Power: A Comprehensive Review. Materials (Basel) 2024; 17:955. [PMID: 38399205 PMCID: PMC10890567 DOI: 10.3390/ma17040955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 02/06/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024]
Abstract
This study critically reviews the key aspects of nanoparticles and their impact on molten salts (MSs) for thermal energy storage (TES) in concentrated solar power (CSP). It then conducts a comprehensive analysis of MS nanofluids, focusing on identifying the best combinations of salts and nanoparticles to increase the specific heat capacity (SHC) efficiently. Various methods and approaches for the synthesis of these nanofluids are explained. The article presents different experimental techniques used to characterize nanofluids, including measuring the SHC and thermal conductivity and analyzing particle dispersion. It also discusses the challenges associated with characterizing these nanofluids. The study aims to investigate the underlying mechanisms behind the observed increase in SHC in MS nanofluids. Finally, it summarizes potential areas for future research, highlighting crucial domains for further investigation and advancement.
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Affiliation(s)
- Fahim Mahtab Abir
- School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI 48859, USA; (F.M.A.); (Q.A.)
| | - Qutaiba Altwarah
- School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI 48859, USA; (F.M.A.); (Q.A.)
| | - Md Tasnim Rana
- Bangladesh Council of Scientific and Industrial Research, Dhaka 1205, Bangladesh
| | - Donghyun Shin
- School of Engineering and Technology, Central Michigan University, Mt. Pleasant, MI 48859, USA; (F.M.A.); (Q.A.)
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D’Arienzo L, Acierno S, Patti A, Di Maio L. Cellulose/Polyhydroxybutyrate (PHB) Composites as a Sustainable Bio-Based Feedstock to 3D-Printing Applications. Materials (Basel) 2024; 17:916. [PMID: 38399168 PMCID: PMC10890324 DOI: 10.3390/ma17040916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 01/27/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024]
Abstract
In this work, we have studied the potential application for 3D-printing of a polymer made from combining a biodegradable and biocompatible polymer (i.e., polyhydroxybutyrate, PHB) with natural bio-based fiber (i.e., cellulose). To this end, a masterbatch at 15 wt.% in filler content was prepared by melt-blending, and then this system was "diluted" with pure PHB in a second extrusion phase in order to produce filaments at 1.5 and 3 wt.% of cellulose. For comparison, a filament made of 100% virgin PHB pellets was prepared under the same conditions. All the systems were then processed in the 3D-printer apparatus, and specimens were mainly characterized by static (tensile and flexural testing) and dynamic mechanical analysis. Thermogravimetric analysis, differential scanning calorimetry, spectroscopic measurements, and morphological aspects of PHB polymer and composites were also discussed. The results showed a significant negative impact of the process on the mechanical properties of the basic PHB with a reduction in both tensile and flexural mechanical properties. The PHB-cellulose composites showed a good dispersion filler in the matrix but a poor interfacial adhesion between the two phases. Furthermore, the cellulose had no effect on the melting behavior and the crystallinity of the polymer. The addition of cellulose improved the thermal stability of the polymer and minimized the negative impact of extrusion. The mechanical performance of the composites was found to be higher compared to the corresponding (processed) polymer.
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Affiliation(s)
- Lucia D’Arienzo
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (L.D.); (L.D.M.)
| | - Stefano Acierno
- Department of Engineering, University of Sannio, Piazza Roma 21, 82100 Benevento, Italy
| | - Antonella Patti
- Department of Civil Engineering and Architecture (DICAr), University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy;
| | - Luciano Di Maio
- Department of Industrial Engineering, University of Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Italy; (L.D.); (L.D.M.)
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Blazevicius D, Grigalevicius S. A Review of Benzophenone-Based Derivatives for Organic Light-Emitting Diodes. Nanomaterials (Basel) 2024; 14:356. [PMID: 38392729 PMCID: PMC10892487 DOI: 10.3390/nano14040356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/06/2024] [Accepted: 02/09/2024] [Indexed: 02/24/2024]
Abstract
Organic light-emitting diodes (OLEDs) have garnered considerable attention in academic and industrial circles due to their potential applications in flat-panel displays and solid-state lighting technologies, leveraging the advantages offered by organic electroactive derivatives over their inorganic counterparts. The thin and flexible design of OLEDs enables the development of innovative lighting solutions, facilitating the creation of customizable and contoured lighting panels. Among the diverse electroactive components employed in the molecular design of OLED materials, the benzophenone core has attracted much attention as a fragment for the synthesis of organic semiconductors. On the other hand, benzophenone also functions as a classical phosphor with high intersystem crossing efficiency. This characteristic makes it a compelling candidate for effective reverse intersystem crossing, with potential in leading to the development of thermally activated delayed fluorescent (TADF) emitters. These emitting materials witnessed a pronounced interest in recent years due to their incorporation in metal-free electroactive frameworks and the capability to convert triplet excitons into emissive singlet excitons through reverse intersystem crossing (RISC), consequently achieving exceptionally high external quantum efficiencies (EQEs). This review article comprehensively overviews the synthetic pathways, thermal characteristics, electrochemical behaviour, and photophysical properties of derivatives based on benzophenone. Furthermore, we explore their applications in OLED devices, both as host materials and emitters, shedding light on the promising opportunities that benzophenone-based compounds present in advancing OLED technology.
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Affiliation(s)
- Dovydas Blazevicius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
| | - Saulius Grigalevicius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
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Bombardi L, Salini A, Aulitto M, Zuliani L, Andreolli M, Bordoli P, Coltro A, Vitulo N, Zaccone C, Lampis S, Fusco S. Lignocellulolytic Potential of Microbial Consortia Isolated from a Local Biogas Plant: The Case of Thermostable Xylanases Secreted by Mesophilic Bacteria. Int J Mol Sci 2024; 25:1090. [PMID: 38256164 PMCID: PMC10816813 DOI: 10.3390/ijms25021090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/05/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024] Open
Abstract
Lignocellulose biomasses (LCB), including spent mushroom substrate (SMS), pose environmental challenges if not properly managed. At the same time, these renewable resources hold immense potential for biofuel and chemicals production. With the mushroom market growth expected to amplify SMS quantities, repurposing or disposal strategies are critical. This study explores the use of SMS for cultivating microbial communities to produce carbohydrate-active enzymes (CAZymes). Addressing a research gap in using anaerobic digesters for enriching microbiomes feeding on SMS, this study investigates microbial diversity and secreted CAZymes under varied temperatures (37 °C, 50 °C, and 70 °C) and substrates (SMS as well as pure carboxymethylcellulose, and xylan). Enriched microbiomes demonstrated temperature-dependent preferences for cellulose, hemicellulose, and lignin degradation, supported by thermal and elemental analyses. Enzyme assays confirmed lignocellulolytic enzyme secretion correlating with substrate degradation trends. Notably, thermogravimetric analysis (TGA), coupled with differential scanning calorimetry (TGA-DSC), emerged as a rapid approach for saccharification potential determination of LCB. Microbiomes isolated at mesophilic temperature secreted thermophilic hemicellulases exhibiting robust stability and superior enzymatic activity compared to commercial enzymes, aligning with biorefinery conditions. PCR-DGGE and metagenomic analyses showcased dynamic shifts in microbiome composition and functional potential based on environmental conditions, impacting CAZyme abundance and diversity. The meta-functional analysis emphasised the role of CAZymes in biomass transformation, indicating microbial strategies for lignocellulose degradation. Temperature and substrate specificity influenced the degradative potential, highlighting the complexity of environmental-microbial interactions. This study demonstrates a temperature-driven microbial selection for lignocellulose degradation, unveiling thermophilic xylanases with industrial promise. Insights gained contribute to optimizing enzyme production and formulating efficient biomass conversion strategies. Understanding microbial consortia responses to temperature and substrate variations elucidates bioconversion dynamics, emphasizing tailored strategies for harnessing their biotechnological potential.
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Affiliation(s)
- Luca Bombardi
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
| | - Andrea Salini
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
| | - Martina Aulitto
- Department of Biology, University of Naples Federico II, 80126 Naples, Italy;
| | - Luca Zuliani
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
| | - Marco Andreolli
- Lab of Environmental Microbiology & VUCC-DBT Verona University Culture Collection, Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.)
| | - Paola Bordoli
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
| | - Annalaura Coltro
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
| | - Nicola Vitulo
- Computational Genomics Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy;
| | - Claudio Zaccone
- Lab of Soil and Biomass Chemistry, Department of Biotechnology, University of Verona, 37134 Verona, Italy;
| | - Silvia Lampis
- Lab of Environmental Microbiology & VUCC-DBT Verona University Culture Collection, Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (M.A.); (S.L.)
| | - Salvatore Fusco
- Biochemistry and Industrial Biotechnology (BIB) Laboratory, Department of Biotechnology, University of Verona, 37134 Verona, Italy; (L.B.); (A.S.); (L.Z.); (P.B.); (A.C.)
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Gao L, Li X, Yan X, Zhang X. Ethylenediamine Salt Enhances the Solubility and Dissolution of Flurbiprofen. ChemistryOpen 2024:e202300262. [PMID: 38214691 DOI: 10.1002/open.202300262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2023] [Revised: 12/05/2023] [Indexed: 01/13/2024] Open
Abstract
Drugs that are poorly soluble in water are difficult to absorb orally, resulting in low bioavailability. Flurbiprofen (FLU) is an arylpropionic acid nonsteroidal anti-inflammatory drug belonging to BCS class II, with low water solubility. In this study, a novel flurbiprofen-ethylenediamine salt (FLU-EDA) was successfully prepared via solvent crystallization. Its crystal structure was determined via single-crystal X-ray diffraction (SXRD). Further, the physicochemical properties of FLU-EDA salt were characterized by powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC), and Fourier transform infrared spectroscopy (FT-IR). The solubility and intrinsic dissolution rate (IDR) of FLU-EDA salt in water were investigated. The results showed that compared with FLU, the solubility and IDR of FLU-EDA salt increased by 57-fold and 32-fold, respectively. This indicates that FLU-EDA salt can significantly enhance the solubility and dissolution rate of flurbiprofen in water. This study provides basic data and theory for the development of new formulations of flurbiprofen.
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Affiliation(s)
- Lei Gao
- College of Food and Pharmaceutical Engineering, Wuzhou University, 543000, Wuzhou, P. R. China
| | - Xiaojie Li
- College of Food and Pharmaceutical Engineering, Wuzhou University, 543000, Wuzhou, P. R. China
| | - Xiaolin Yan
- College of Food and Pharmaceutical Engineering, Wuzhou University, 543000, Wuzhou, P. R. China
| | - Xianrui Zhang
- College of Food and Pharmaceutical Engineering, Wuzhou University, 543000, Wuzhou, P. R. China
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12
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Chen X, Chen J, Xi W, Cai Q, Cheng J, Jiang W. Effect of Vanadium Addition on Solidification Microstructure and Mechanical Properties of Al-4Ni Alloy. Materials (Basel) 2024; 17:332. [PMID: 38255500 PMCID: PMC10820605 DOI: 10.3390/ma17020332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/02/2024] [Accepted: 01/07/2024] [Indexed: 01/24/2024]
Abstract
The effects of vanadium addition on the solidification microstructure and mechanical properties of Al-4Ni alloy were investigated via thermodynamic computation, thermal analysis, microstructural observations, and mechanical properties testing. The results show that the nucleation temperature of primary α-Al increased with increased vanadium addition. A transition from columnar to equiaxed growth took place when adding vanadium to Al-4Ni alloys, and the average grain size of primary α-Al was reduced from 1105 μm to 252 μm. When the vanadium addition was 0.2 wt%, the eutectic nucleation temperature increased from 636.2 °C for the Al-4Ni alloy to 640.5 °C, and the eutectic solidification time decreased from 310 s to 282 s. The average diameter of the eutectic Al3Ni phases in the Al-4Ni-0.2V alloy reduced to 0.14 μm from 0.26 μm for the Al-4Ni alloy. As the vanadium additions exceeded 0.2 wt%, the eutectic nucleation temperature had no obvious change and the eutectic solidification time increased. The eutectic Al3Ni phases began to coarsen, and the number of lamellar eutectic boundaries increased. The mechanical properties of Al-4Ni alloys gradually increased with vanadium addition (0-0.4 wt%). The Al-4Ni-0.4V alloy obtained the maximum tensile strength and elongation values, which were 136.4 MPa and 23.5%, respectively. As the vanadium addition exceeded 0.4 wt%, the strength and elongation decreased, while the hardness continued to increase. Fracture in the Al-4Ni-0.4V alloy exhibited ductile fracture, while fracture in the Al-4Ni-0.6V alloy was composed of dimples, tear edges, and cleavage planes, demonstrating mixed ductile-brittle fracture. The cleavage planes were caused by the primary Al10V and coarse Al3Ni phases at the boundary of eutectic cells.
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Affiliation(s)
| | | | | | - Qizhou Cai
- State Key Laboratory of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; (X.C.); (J.C.); (W.X.); (J.C.); (W.J.)
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13
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Blazevicius D, Siddiqui I, Gautam P, Krucaite G, Tavgeniene D, Nagar MR, Kumar K, Banik S, Jou JH, Grigalevicius S. Bicarbazole-Benzophenone-Based Twisted Donor-Acceptor-Donor Derivatives as Blue Emitters for Highly Efficient Fluorescent Organic Light-Emitting Diodes. Nanomaterials (Basel) 2024; 14:146. [PMID: 38251111 PMCID: PMC10819850 DOI: 10.3390/nano14020146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Revised: 01/04/2024] [Accepted: 01/05/2024] [Indexed: 01/23/2024]
Abstract
This paper delves into the development of a group of twisted donor-acceptor-donor (D-A-D) derivatives incorporating bicarbazole as electron donor and benzophenone as electron acceptor for potential use as blue emitters in OLEDs. The derivatives were synthesized in a reaction of 4,4'-difluorobenzophenone with various 9-alkyl-9'H-3,3'-bicarbazoles. The materials, namely, DB14, DB23, and DB29, were designed with different alkyl side chains to enhance their solubility and film-forming properties of layers formed using the spin-coating from solution method. The new materials demonstrate high thermal stabilities with decomposition temperatures >383 °C, glass transition temperatures in the range of 95-145 °C, high blue photoluminescence quantum yields (>52%), and short decay times, which range in nanoseconds. Due to their characteristics, the derivatives were used as blue emitters in OLED devices. Some of the OLEDs incorporating the DB23 emitter demonstrated a high external quantum efficiency (EQEmax) of 5.3%, which is very similar to the theoretical limit of the first-generation devices.
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Affiliation(s)
- Dovydas Blazevicius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
| | - Iram Siddiqui
- Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., East District, Hsinchu 30013, Taiwan
| | - Prakalp Gautam
- Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., East District, Hsinchu 30013, Taiwan
| | - Gintare Krucaite
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
| | - Daiva Tavgeniene
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
| | - Mangey Ram Nagar
- Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., East District, Hsinchu 30013, Taiwan
| | - Krishan Kumar
- School of Chemical Sciences, Indian Institute of Technology—Mandi, Kamand 175005, Himachal Pradesh, India
| | - Subrata Banik
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Jwo-Huei Jou
- Department of Materials Science and Engineering, National Tsing Hua University, No. 101, Section 2, Guangfu Rd., East District, Hsinchu 30013, Taiwan
| | - Saulius Grigalevicius
- Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT50254 Kaunas, Lithuania
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14
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Ahmed J, Giri BR, Reza MA, Qasim SSB, Thomas L, Al-Attar H, Maniruzzaman M. Twin-screw extrusion of vitamin D3/iron-blend granules in corn and lentil composite flours: Stability, microstructure, and interaction of vitamin D3 with human osteoblast cells. J Food Sci 2024; 89:435-449. [PMID: 38018266 DOI: 10.1111/1750-3841.16841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/12/2023] [Accepted: 10/31/2023] [Indexed: 11/30/2023]
Abstract
Vitamin D3 (VD3) and iron-blend granules were blended with corn and lentil composite flour (75/25, w/w) and fed into a pilot-scale twin-screw extruder to produce ready-to-eat snacks. The morphology and microstructure of extruded snacks were examined using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX), X-ray powder diffraction, and FT-IR. Differential scanning calorimetry and thermogravimetric analysis measured the melting temperature and thermal stability of the extrudates. SEM and FT-IR analysis demonstrate that micronutrients are mixed well in formulations used in extrudates at high shear and high temperatures. The SEM-EDX exhibited the presence of iron, whereas high performance liquid chromatography measurements confirmed the significant retention of VD3 in the extruded snacks. The interaction between VD3 and human osteoblast cells was studied using live imaging and the MMT assay. Overall, for the first time, VD3 and Fe2+ blend granules have been used in an extrusion platform, which has significant potential for the intervention of VD3 and iron deficiencies. PRACTICAL APPLICATION: For the first time, we reported the use of VD3/iron-blend granules in extruded products. The findings of this work demonstrated the thermal stability and capability of providing adequate quantities of VD3 and iron in corn flour/lentil flour/VD3-iron blend extruded snacks. Furthermore, the interaction of VD3 with osteoblast cells highlights the potential health benefits of the extrudates.
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Affiliation(s)
- Jasim Ahmed
- Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, Safat, Kuwait
| | - Bhupendra Raj Giri
- Pharmaceutical Engineering and 3D printing Lab (PharmE3D), The Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, Texas, USA
| | | | - Syed S Bin Qasim
- Department of Bioclinical Sciences, Faculty of Dentistry, Kuwait University, Safat, Kuwait
| | - Linu Thomas
- Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, Safat, Kuwait
| | - Hasan Al-Attar
- Environment and Life Sciences Research Center, Kuwait Institute for Scientific Research, Safat, Kuwait
| | - Mohammed Maniruzzaman
- Pharmaceutical Engineering and 3D printing Lab (PharmE3D), The Division of Molecular Pharmaceutics and Drug Delivery, College of Pharmacy, The University of Texas at Austin, Austin, Texas, USA
- Pharmaceutical Engineering and 3D printing Lab (PharmE3D), Department of Pharmaceutics and Drug DeliverySchool of Pharmacy, The University of Mississippi, Oxford, Mississippi, USA
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15
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Di R, Rades T, Grohganz H. Destabilization of Indomethacin-Paracetamol Co-Amorphous Systems by Mechanical Stress. Pharmaceutics 2023; 16:67. [PMID: 38258078 PMCID: PMC10818836 DOI: 10.3390/pharmaceutics16010067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2023] [Revised: 12/15/2023] [Accepted: 12/21/2023] [Indexed: 01/24/2024] Open
Abstract
Using co-amorphous systems (CAMS) has shown promise in addressing the challenges associated with poorly water-soluble drugs. Quench-cooling is a commonly used CAMS preparation method, often followed by grinding or milling to achieve a fine powder that is suitable for subsequent characterization or further down-stream manufacturing. However, the impact of mechanical stress applied to CAMS has received little attention. In this study, the influence of mechanical stress on indomethacin-paracetamol CAMS was investigated. The investigation involved thermal analysis and solid-state characterization across various CAMS mixing ratios and levels of mechanical stress. The study revealed a negative effect of mechanical stress on stability, particularly on the excess components in CAMS. Higher levels of mechanical stress were observed to induce phase separation or recrystallization. Notably, samples at the optimal mixing ratio demonstrated greater resistance to the destabilization caused by mechanical stress. These results showed the significance of careful consideration of processing methods during formulation and the significance of optimizing mixing ratios in CAMS.
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Affiliation(s)
| | - Thomas Rades
- Department of Pharmacy, University of Copenhagen, 2200 Copenhagen, Denmark; (R.D.); (H.G.)
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16
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Mun JS, Mun SP. Structural and Thermal Characterization of Milled Wood Lignin from Bamboo ( Phyllostachys pubescens) Grown in Korea. Molecules 2023; 29:183. [PMID: 38202765 PMCID: PMC10780058 DOI: 10.3390/molecules29010183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/22/2023] [Accepted: 12/26/2023] [Indexed: 01/12/2024] Open
Abstract
The structural and thermal characterization of milled wood lignin (MWL) prepared from bamboo (Phyllostachys pubescens) grown in Korea was investigated, and the results were compared with bamboo MWLs from other studies. The C9 formula of the bamboo MWL was C9H7.76O3.23N0.02 (OCH3)1.41. The Mw and Mn of MWL were 13,000 and 4400 Da, respectively, which resulted in a polydispersity index (PDI) of 3.0. The PDI of the prepared MWL was higher than other bamboo MWLs (1.3-2.2), suggesting a broader molecular weight distribution. The structural features of MWL were elucidated using FT-IR spectroscopy and NMR techniques (1H, 13C, HSQC, 31P NMR), which indicate that MWL is of the HGS-type lignin. The major lignin linkages (β-O-4, β-β, β-5) were not different from other bamboo MWLs. The syringyl/guaiacyl ratio, determined from 1H NMR, was calculated as 0.89. 31P NMR revealed variations in hydroxyl content, with a higher aliphatic hydroxyl content in MWL compared to other bamboo MWLs. Thermal properties were investigated through TGA, DSC, and pyrolysis-GC/MS spectrometry (Py-GC/MS). The DTGmax of MWL under inert conditions was 287 °C, and the Tg of MWL was 159 °C. Py-GC/MS at 675 °C revealed a syringyl, guaiacyl, p-hydroxyphenyl composition of 17:37:47.
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Affiliation(s)
- Ji-Sun Mun
- Department of Carbon Materials and Fiber Engineering, Jeonbuk National University, Jeonju 54896, Republic of Korea;
| | - Sung-Phil Mun
- Department of Wood Science and Technology, Jeonbuk National University, Jeonju 54896, Republic of Korea
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17
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Chen J, Li S, Wang X, Fang L, Huang D, Ke L, Chen J, Wang Q, Zhang H, Wu Y, Zhu D, Li C, Hao X. Synthesis and Characterization of Pressure-Sensitive Adhesives Based on a Naphthyl Curing Agent. Polymers (Basel) 2023; 15:4516. [PMID: 38231956 PMCID: PMC10707846 DOI: 10.3390/polym15234516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/15/2023] [Accepted: 11/18/2023] [Indexed: 01/19/2024] Open
Abstract
The incorporation of a naphthyl curing agent (NCA) can enhance the thermal stability of pressure-sensitive adhesives (PSAs). In this study, a PSA matrix was synthesized using a solution polymerization process and consisted of butyl acrylate, acrylic acid, and an ethyl acrylate within an acrylic copolymer. Benzoyl peroxide was used as an initiator during the synthesis. To facilitate the UV curing of the solvent-borne PSAs, glycidyl methacrylate was added to introduce unsaturated carbon double bonds. The resulting UV-curable acrylic PSA tapes exhibited longer holding times at high temperatures (150 °C) compared to uncross-linked PSA tapes, without leaving any residues on the substrate surface. The thermal stability of the PSA was further enhanced by adding more NCA and increasing the UV dosage. This may be attributed to the formation of cross-linking networks within the polymer matrix at higher doses. The researchers successfully balanced the adhesion performance and thermal stability by modifying the amount of NCA and UV radiation, despite the peel strength declining and the holding duration shortening. This research also investigated the effects of cross-linking density on gel content, molecular weight, glass transition temperature, and other properties of the PSAs.
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Affiliation(s)
- Junhua Chen
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China
| | - Shiting Li
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Xuan Wang
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Lili Fang
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Dingding Huang
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Lin Ke
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Jinlian Chen
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - Qingwei Wang
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
| | - He Zhang
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China
| | - Yinping Wu
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China
| | - Dongyu Zhu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou 510006, China;
| | - Chunsheng Li
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China
| | - Xiangying Hao
- School of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; (J.C.); (S.L.); (X.W.); (L.F.); (D.H.); (L.K.); (J.C.); (Q.W.); (H.Z.); (Y.W.)
- Guangdong Provincial Key Laboratory of Environmental Health and Land Resource, College of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China
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18
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Song Z, Liu W, Xian M, Jin M. Facile Fabrication of Energetic Nanocomposite Materials by Polydopamine. Int J Mol Sci 2023; 24:16199. [PMID: 38003388 PMCID: PMC10671231 DOI: 10.3390/ijms242216199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 11/02/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023] Open
Abstract
Polydopamine-based materials have been widely investigated for incorporation in energetic nanocomposites due to their outstanding adherence. However, these materials are often prepared in alkaline environments, which negatively affects Al nanoparticles. In this study, a one-pot assembly was devised for the preparation of a polydopamine-based Al/CuO energetic nanocomposite material (Al/PDA/CuO) in a neutral environment. The CuO and Al nanoparticles of the Al/PDA/CuO nanothermite were uniformly dispersed and closely combined. Consequently, the Al/PDA/CuO nanothermite was able to release more heat (2069.7 J/g) than physically mixed Al/CuO (1438.9 J/g). Furthermore, the universality of using polydopamine in the assembly of different types of energetic nanocomposite materials was verified, including an organic energetic material-nanothermit (HMX/PDA/Al/CuO nanothermite) and an inorganic oxidant-metal nanocatalyst (AP/PDA/Fe2O3). This study provides a promising route for the preparation of polydopamine-based energetic nanocomposites in neutral aqueous solutions.
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Affiliation(s)
- Zhanxin Song
- Chinese Academy of Sciences Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Z.S.); (W.L.)
- Shandong Energy lnstitute, Qingdao 266101, China
- Qingdao New Energy Shandong Laboratory, Qingdao 266001, China
| | - Wei Liu
- Chinese Academy of Sciences Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Z.S.); (W.L.)
| | - Mo Xian
- Chinese Academy of Sciences Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Z.S.); (W.L.)
- Shandong Energy lnstitute, Qingdao 266101, China
- Qingdao New Energy Shandong Laboratory, Qingdao 266001, China
| | - Miaomiao Jin
- Chinese Academy of Sciences Key Laboratory of Biobased Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; (Z.S.); (W.L.)
- Shandong Energy lnstitute, Qingdao 266101, China
- Qingdao New Energy Shandong Laboratory, Qingdao 266001, China
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19
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Turebayeva P, Luchsheva V, Fedorishin D, Yerkassov R, Bakibaev A, Bolysbekova S, Tugambayeva T, Sergazina S, Nurmukhanbetova N. Nanoparticles Based on Silver Chloride and Bambusuril[6] for the Fine-Tuning of Biological Activity. Int J Mol Sci 2023; 24:16126. [PMID: 38003315 PMCID: PMC10670921 DOI: 10.3390/ijms242216126] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/03/2023] [Accepted: 11/05/2023] [Indexed: 11/26/2023] Open
Abstract
The prevalence of numerous infectious diseases has emerged as a grave concern within the realm of healthcare. Currently, the issue of antibiotic resistance is compelling scientists to explore novel treatment approaches. To combat these infectious diseases, various treatment methods have been developed, harnessing cutting-edge disinfecting nanomaterials. Among the range of metallic nanoparticles employed in medicine, silver nanoparticles (AgNPs) stand out as both highly popular and well-suited for the task. They find extensive utility in cancer diagnosis and therapies and as effective antibacterial agents. The interaction between silver and bacterial cells induces significant structural and morphological alterations, ultimately leading to cell demise. In this study, nanoparticles based on silver and bambusuril[6] (BU[6]) were developed for the first time. These NPs can be used for different biomedical purposes. A simple, single-step, and effective synthesis method was employed to produce bambusuril[6]-protected silver chloride nanoparticles (BU[6]-Ag/AgCl NPs) through the complexation of BU[6] with silver nitrate. The NPs were characterized using X-ray phase analysis (XPS), infrared spectroscopy (IR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). When the SEM images were examined, it was seen that the synthesized BU[6]-Ag/AgCl NPs were distributed with homogeneous sizes, and the synthesized NPs were mostly spherical and cubic. The EDS spectra of BU[6]-Ag/AgCl NPs demonstrated the presence of Ag, Cl, and all expected elements. BU[6]-Ag/AgCl NPs showed high antibacterial activity against both E. coli and S. aureus bacteria.
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Affiliation(s)
- Pana Turebayeva
- Department of Chemistry, L.N. Gumilyov Eurasian National University, 010000 Astana, Kazakhstan; (P.T.); (R.Y.)
| | - Venera Luchsheva
- Faculty of Chemistry, National Research Tomsk State University, 634050 Tomsk, Russia; (V.L.); (D.F.)
| | - Dmitriy Fedorishin
- Faculty of Chemistry, National Research Tomsk State University, 634050 Tomsk, Russia; (V.L.); (D.F.)
| | - Rakhmetulla Yerkassov
- Department of Chemistry, L.N. Gumilyov Eurasian National University, 010000 Astana, Kazakhstan; (P.T.); (R.Y.)
| | - Abdigali Bakibaev
- Faculty of Chemistry, National Research Tomsk State University, 634050 Tomsk, Russia; (V.L.); (D.F.)
| | - Saltanat Bolysbekova
- Higher School of Scientific Research, Astana International University, 010000 Astana, Kazakhstan;
| | - Tokzhan Tugambayeva
- Department of Chemistry and Chemical Technologies, Toraighyrov University, 140008 Pavlodar, Kazakhstan;
| | - Samal Sergazina
- Department of Chemistry and Biotechnology, Sh. Ualikhanov University, 020000 Kokshetau, Kazakhstan; (S.S.); (N.N.)
| | - Nurgul Nurmukhanbetova
- Department of Chemistry and Biotechnology, Sh. Ualikhanov University, 020000 Kokshetau, Kazakhstan; (S.S.); (N.N.)
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20
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Głowacka J, Derpeński Ł, Frydrych M, Sztorch B, Bartoszewicz B, Przekop RE. Robotization of Three-Point Bending Mechanical Tests Using PLA/TPU Blends as an Example in the 0-100% Range. Materials (Basel) 2023; 16:6927. [PMID: 37959523 PMCID: PMC10650072 DOI: 10.3390/ma16216927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/18/2023] [Accepted: 10/22/2023] [Indexed: 11/15/2023]
Abstract
This article presents the development of an automated three-point bending testing system using a robot to increase the efficiency and precision of measurements for PLA/TPU polymer blends as implementation high-throughput measurement methods. The system operates continuously and characterizes the flexural properties of PLA/TPU blends with varying TPU concentrations. This study aimed to determine the effect of TPU concentration on the strength and flexural stiffness, surface properties (WCA), thermal properties (TGA, DSC), and microscopic characterization of the studied blends.
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Affiliation(s)
- Julia Głowacka
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (J.G.); (M.F.); (B.S.)
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland
| | - Łukasz Derpeński
- Faculty of Mechanical Engineering, Bialystok University of Technology, 45C Wiejska, 15-351 Bialystok, Poland; (Ł.D.); (B.B.)
| | - Miłosz Frydrych
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (J.G.); (M.F.); (B.S.)
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland
| | - Bogna Sztorch
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (J.G.); (M.F.); (B.S.)
| | - Błażej Bartoszewicz
- Faculty of Mechanical Engineering, Bialystok University of Technology, 45C Wiejska, 15-351 Bialystok, Poland; (Ł.D.); (B.B.)
| | - Robert E. Przekop
- Centre for Advanced Technologies, Adam Mickiewicz University in Poznań, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland; (J.G.); (M.F.); (B.S.)
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21
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Borcan F, Vlase T, Vlase G, Popescu R, Soica CM. The Influence of an Isocyanate Structure on a Polyurethane Delivery System for 2'-Deoxycytidine-5'-monophosphate. J Funct Biomater 2023; 14:526. [PMID: 37888191 PMCID: PMC10607123 DOI: 10.3390/jfb14100526] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/16/2023] [Accepted: 10/17/2023] [Indexed: 10/28/2023] Open
Abstract
The delivery of nucleosides represents an interesting research trend in recent years due to their application in various viral infections. The main aims of this study were to develop and to characterize polyurethane particles that are intended to be used for the transport of nucleosides. Three samples have been prepared using aliphatic diisocyanates, a mixture of polyethylene glycol, polycaprolactone, and diols, respectively. The samples were characterized through refractivity measurements, drug loading efficacy, release and penetration rate investigations, FTIR and Raman spectroscopy, thermal analyses, Zetasizer, SEM, HDFa cells viability, and irritation tests on mice skin. The results indicate the obtaining of particles with sizes between 132 and 190 nm, positive Zeta potential values (28.3-31.5 mV), and a refractivity index around 1.60. A good thermal stability was found, and SEM images show a medium tendency to agglomerate. The samples' color, pH, and electrical conductivity have changed only to a small extent over time, and the evaluations indicate an almost 70% encapsulation efficacy, a prolonged release, and that around 70% of particles have penetrated an artificial membrane in the first 24 h. The synthesized products should be tested in further clinical trials, and the current tests on cell cultures and mice skin revealed no side effects.
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Affiliation(s)
- Florin Borcan
- Department I, Advanced Instrumental Screening Center, Faculty of Pharmacy, “Victor Babes” University of Medicine and Pharmacy, 2 E. Murgu Sq., 300041 Timisoara, Romania
| | - Titus Vlase
- Research Center “Thermal Analysis in Environmental Problems”, Faculty of Chemistry, Biology, Geography, West University of Timisoara, 16 Pestalozzi Str., 300115 Timisoara, Romania; (T.V.); (G.V.)
| | - Gabriela Vlase
- Research Center “Thermal Analysis in Environmental Problems”, Faculty of Chemistry, Biology, Geography, West University of Timisoara, 16 Pestalozzi Str., 300115 Timisoara, Romania; (T.V.); (G.V.)
| | - Roxana Popescu
- Department II, Faculty of Medicine, “Victor Babes” University of Medicine and Pharmacy, 14A T. Vladimirescu Str., 300041 Timisoara, Romania;
| | - Codruta M. Soica
- Department II, Faculty of Pharmacy, “Victor Babes” University of Medicine and Pharmacy, 2 E. Murgu Sq., 300041 Timisoara, Romania;
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22
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Mohammadi N, Ostovar N. Physicochemical, rheological and structural characterisation of Bene gum exudates from Pistacia eurycarpa Yalt. Nat Prod Res 2023; 37:3492-3498. [PMID: 35700083 DOI: 10.1080/14786419.2022.2087651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Revised: 05/24/2022] [Accepted: 06/02/2022] [Indexed: 10/18/2022]
Abstract
Bene gum was investigated for its physicochemical and structural properties in comparison to gum arabic and gum tragacanth. Elemental analysis of the Bene gum sample revealed sodium and potassium content to be 57.21 and 0.95 ppm, respectively. According to the rheological properties, all gum solutions exhibited non-Newtonian, shear-thinning in the concentration of 1% (w/w). Both storage modulus G' and loss modulus G″ of all gums demonstrated elastic properties. The GC-MS analysis of dichloromethane extract confirmed the presence of eight constituents and α-pinene is the predominant constituent. The NMR spectra of the gum sample showed resemblance in individual sugar ingredients and the specific patterns of gum were observed. FTIR spectra of the studied gums displayed the presence of the same functional groups in the three gums. XRD studies revealed the amorphous nature of Bene gum. DSC and TGA thermograms were characteristic for each gum. Major thermal transitions were determined.
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Affiliation(s)
- Nima Mohammadi
- Department of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Nikoo Ostovar
- Department of Food Science and Technology, Science and Research Branch, Islamic Azad University, Tehran, Iran
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23
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Timakova EV, Afonina LI, Drebushchak TN, Zakharov BA. Two new bismuth salts with succinic acid: synthesis, structural, spectroscopic and thermal characterization. Acta Crystallogr C Struct Chem 2023; 79:409-416. [PMID: 37733617 DOI: 10.1107/s2053229623008124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Accepted: 09/16/2023] [Indexed: 09/23/2023] Open
Abstract
Two novel bismuth succinate hydrates, namely, poly[[diaqua(μ3-butane-1,4-dicarboxylato)hemi(μ-butane-1,4-dicarboxylato)bismuth] monohydrate], {[Bi(C4H4O4)1.5(H2O)2]·H2O}n (1), and poly[[μ-aqua-aqua(μ3-butane-1,4-dicarboxylato)(μ-butane-1,4-dicarboxylato)-μ-oxido-dibismuth] monohydrate], {[Bi2(C4H4O4)2O(H2O)2]·H2O}n (2), have been synthesized. Their crystal structures were determined by single-crystal X-ray diffraction and the compounds were characterized by IR and Raman spectroscopy, powder X-ray diffraction and thermal analysis. The crystal structure analysis revealed that the compounds are coordination polymers, with 1 having a two-dimensional layered structure and 2 displaying a three-dimensional (3D) framework. Fully deprotonated succinate anions (C4H4O42-) in two different conformations (trans and gauche) are included in their composition. The Bi3+ cations are surrounded by O atoms from the carboxylate groups of succinate anions and aqua ligands. BiO9 coordination polyhedra in 1 are connected in pairs by edges. These pairs are bound together by bridging succinate ligands to form layers. Bismuth coordination polyhedra of two different types (BiO9 and BiO7) in 2 are connected by edges to form infinite ribbons. Ribbons of polyhedra with bridging succinate ligands form a 3D polymeric structure.
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Affiliation(s)
- Evgeniya V Timakova
- Institute of Solid State Chemistry and Mechanochemistry, SB RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation
| | - Liubov I Afonina
- Institute of Solid State Chemistry and Mechanochemistry, SB RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation
| | - Tatiana N Drebushchak
- Institute of Solid State Chemistry and Mechanochemistry, SB RAS, Kutateladze 18, Novosibirsk 630128, Russian Federation
| | - Boris A Zakharov
- Novosibirsk State University, Pirogova 2, Novosibirsk 630090, Russian Federation
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24
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Aversa R, Ricciotti L, Perrotta V, Apicella A. Chemorheology of a Si/Al > 3 Alkali Activated Metakaolin Paste through Parallel Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA). Polymers (Basel) 2023; 15:3922. [PMID: 37835971 PMCID: PMC10575445 DOI: 10.3390/polym15193922] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Revised: 09/25/2023] [Accepted: 09/26/2023] [Indexed: 10/15/2023] Open
Abstract
Although geopolymers, as structural materials, should have superior engineering properties than traditional cementitious materials, they often need to improve their final characteristics' reproducibility due to the need for more control of the complex silico-aluminate decomposition and polymerisation stages. Thermosetting of a reactive geopolymeric paste involves tetrahedral Silicate and Aluminate precursor condensation into polyfunctional oligomers of progressively higher molecular weight, transforming the initial liquid into a gel and a structural solid. Viscosity and gelation control become particularly critical when the geopolymer is processed with 3D printing additive technology. Its physical state modification kinetics should match the flow and setting characteristics required by the deposition process. The reaction kinetics and the elastic and viscous characteristics preceding gelation and hardening have been investigated for an alkali-activated Metakaolin/Sodium Silicate-Sodium Hydroxide paste with a Si/Al ratio > 3. A chemoreological approach has been extended to these inorganic polymerisable systems, as already utilised for organic thermosetting polymers. Differential scanning calorimetry and Oscillatory DMA were carried out to monitor the advancement of the polymerisation reaction and the associated variations of the rheological viscoelastic properties. Dynamic thermal scans were run at 1 °C/min and a frequency of 10 Hz for the dynamic mechanical tests. The observed kinetics of polymerisation and variations of the elastic and viscous components of the complex viscosities and shear moduli are described in terms of polycondensation of linear and branched chains of oligomeric macromolecules of increasing complexity and molecular weight up to gelation (Gel1) and cross-linking of the gelled macrostructure (Gel2) and final glassy state. Geopolymerization can be allocated into two main behavioural zones: a viscoelastic liquid paste below 32.5% of reaction advancement and a viscoelastic solid above. Initial complex viscosities range from 2.3 ± 0.9 × 10-5 MPa*s to 6.8 ± 0.9 × 10-2 in the liquid-like state and from 1.9 ± 0.1 MPa to 9.6 ± 2.1 × 102 MPa in the solid-like state.
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Affiliation(s)
- Raffaella Aversa
- Advanced Materials Laboratory, Department of Architecture and Industrial Design, University of Campania, Via San Lorenzo, 81031 Aversa, Italy; (L.R.); (V.P.)
| | | | | | - Antonio Apicella
- Advanced Materials Laboratory, Department of Architecture and Industrial Design, University of Campania, Via San Lorenzo, 81031 Aversa, Italy; (L.R.); (V.P.)
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25
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Stepina I, Zheglova Y. Pyrolysis of Pine Wood in the Presence of Boron-Nitrogen Compounds. Materials (Basel) 2023; 16:6353. [PMID: 37834491 PMCID: PMC10573824 DOI: 10.3390/ma16196353] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 09/09/2023] [Accepted: 09/18/2023] [Indexed: 10/15/2023]
Abstract
The actuality of this research is determined by the intensification of new ways of processing woody biomass. This requires revealing the impact of various physicochemical factors on the thermal degradation of wood biopolymers. Boron-nitrogen surface modifiers are used for wood antisepsis and we decided to check their effect on flammability. The aim of the research was to evaluate the flame retardant effect of boron-nitrogen surface modifiers of wood in an inert atmosphere (nitrogen was used). The evaluation was carried out by thermal analysis of modified and the control pine wood samples. The thermal analysis included thermogravimetry, differential scanning calorimetry and kinetic parameters of thermal degradation. It was found that the flame retardant effect of boron-nitrogen wood surface modifiers was not significantly pronounced in the nitrogen atmosphere. The mechanism of the flame retardant effect of boron-nitrogen compounds is reduced to "shielding" of the surface and increasing the proportion of carbonized residue. On the basis of correlation-regression analysis of kinetic parameters of wood thermodestruction in a nitrogen atmosphere, mathematical models of activation energy dependence on conversion were obtained and substantiated. The developed models can be further applied to calculate the predicted value of wood activation energy in the nitrogen atmosphere at any conversion value.
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Affiliation(s)
- Irina Stepina
- Department of Building Materials Science, National Research Moscow State University of Civil Engineering, Yaroslavskoe sh. 26, 129337 Moscow, Russia
| | - Yulia Zheglova
- Department of Information Systems, Technologies and Automation in Construction, National Research Moscow State University of Civil Engineering, Yaroslavskoe sh. 26, 129337 Moscow, Russia;
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26
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Ristić I, Cakić S, Vukić N, Teofilović V, Tanasić J, Pilić B. The Influence of Soft Segment Structure on the Properties of Polyurethanes. Polymers (Basel) 2023; 15:3755. [PMID: 37765608 PMCID: PMC10536526 DOI: 10.3390/polym15183755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 08/19/2023] [Accepted: 08/22/2023] [Indexed: 09/29/2023] Open
Abstract
A series of polyurethanes (PU) were synthesised via one-step polymerisation without a chain extender, using toluene diisocyanate as well as a variety of soft segments composed of different macrodiols. Poly(D,L-lactide) (PDLLA) and polycaprolactone diol (PCL) were synthesised as a polyester type polyols to obtain soft segments. The process of varying the molar ratio of newly synthesised PDLLA in soft segments has been confirmed as a powerful tool for fine-tuning the final properties of PU. Fourier-transformed infrared spectroscopy was used for evaluation of molecular structures of synthesised PDLLA polyol and final PU. Nuclear magnetic resonance spectrometry was used to confirm the presumed structure of PU. The influence of soft segment composition on polyurethane thermal characteristics was examined using thermogravimetric analysis and differential scanning calorimetry. The composition of soft segments had little impact on the thermal stability of PU materials, which is explained by the comparable structures of both polyester polyols. Wide-angle X-ray scattering was utilised to evaluate the effect of amorphous PDLLA on the degree of crystallinity of PCL in soft PU segments. It was discovered that not only did the PDLLA ratio in the soft segment have a substantial influence on the degree of microphase separation in the soft and hard segments, but it also influenced the crystallisation behaviour of the materials. Furthermore, the restriction of crystallisation of the PCL soft segment has been verified to be dependent on the hard segment concentration and the ratio of PDLLA/PCL polyols. The sample with pure PCL as the polyol component achieved the highest degree of crystallinity (34.8%). The results demonstrated that the composition of soft segments directly affected the properties of obtained polyurethane films. These results can be utilised to easily achieve a desirable set of properties required for application in biomaterials.
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Affiliation(s)
- Ivan Ristić
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21102 Novi Sad, Serbia; (V.T.); (J.T.); (B.P.)
| | - Suzana Cakić
- Faculty of Technology, University of Niš, Bulevar Oslobođenja 124, 16000 Leskovac, Serbia;
| | - Nevena Vukić
- Faculty of Technical Sciences, University of Kragujevac, Svetog Save 65, 32102 Čačak, Serbia
| | - Vesna Teofilović
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21102 Novi Sad, Serbia; (V.T.); (J.T.); (B.P.)
| | - Jelena Tanasić
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21102 Novi Sad, Serbia; (V.T.); (J.T.); (B.P.)
| | - Branka Pilić
- Faculty of Technology Novi Sad, University of Novi Sad, Bulevar cara Lazara 1, 21102 Novi Sad, Serbia; (V.T.); (J.T.); (B.P.)
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Frydrych M, Sztorch B, Przekop RE, Marciniec B. New Ethynylphenylborasilsesquioxanes-Their Reactivity and Behavior during Thermal Decomposition. Int J Mol Sci 2023; 24:13960. [PMID: 37762263 PMCID: PMC10531159 DOI: 10.3390/ijms241813960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Revised: 09/07/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
In this paper, a new type of borasilsesquioxanes was synthesized through a condensation process, and its reactivity in catalytic hydrosilylation reactions with silanes, siloxanes, and silsesquioxanes was investigated. The obtained compounds were mostly obtained in >90% yield. They were fully characterized using spectroscopic (1H, 13C, 29Si NMR) and spectrometric (MALDI-TOF-MS) methods. The next stage of the research involved studying the thermogravimetric properties of the borasilsesquioxanes. By analyzing the different stages of decomposition using spectroscopic techniques (NMR, ATR-FTIR, Raman) and microscopic imaging, it was found that the structure of the borasilsesquioxanes changed during the pyrolysis process and polymer compounds were formed.
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Affiliation(s)
- Miłosz Frydrych
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland (B.M.)
- Centre for Advanced Technologies, Adam Mickiewicz University, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
| | - Bogna Sztorch
- Centre for Advanced Technologies, Adam Mickiewicz University, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
| | - Robert E. Przekop
- Centre for Advanced Technologies, Adam Mickiewicz University, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
| | - Bogdan Marciniec
- Faculty of Chemistry, Adam Mickiewicz University, 8 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland (B.M.)
- Centre for Advanced Technologies, Adam Mickiewicz University, 10 Uniwersytetu Poznańskiego, 61-614 Poznań, Poland;
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Scheepers MC, Lemmerer A. The synthesis and characterization of a series of cocrystals of an isoniazid derivative with butan-2-one and propan-2-one. Acta Crystallogr C Struct Chem 2023; 79:365-373. [PMID: 37610289 PMCID: PMC10561595 DOI: 10.1107/s2053229623007179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 08/15/2023] [Indexed: 08/24/2023] Open
Abstract
Four cocrystals containing N'-(butan-2-ylidene)pyridine-4-carbohydrazide (izbt) and one cocrystal containing N'-isopropylideneisonicotinohydrazide (izact) were synthesized by reacting isoniazid with either butan-2-one (for the former) or acetone (for the latter). The coformers used to synthesize the izbt cocrystals were 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2-chloro-4-nitrobenzoic acid and 1-naphthoic acid. 1-Naphthoic acid was also used with izact to form a cocrystal. The 1:1 cocrystals are: N'-(butan-2-ylidene)pyridine-4-carbohydrazide-1-naphthoic acid (izbt-1nta), C10H13N3O·C11H8O2, N'-(butan-2-ylidene)pyridine-4-carbohydrazide-2,4-dihydroxybenzoic acid (izbt-2,4-dhba), C10H13N3O·C7H6O4, N'-(propan-2-ylidene)pyridine-4-carbohydrazide-1-naphthoic acid (izact-1nta), C9H11N3O·C11H8O2, N'-(butan-2-ylidene)pyridine-4-carbohydrazide-2-chloro-4-nitrobenzoic acid (izbt-2c4n), C10H13N3O·C7H4ClNO4, and N'-(butan-2-ylidene)pyridine-4-carbohydrazide-2,5-dihydroxybenzoic acid (izbt-2,5-dhba), C10H13N3O·C7H6O4. The cocrystals containing izbt were compared to those containing the same (or similar) coformers with izact that have been reported either here or in the Cambridge Structural Database (CSD). Most of the cocrystals showed different packing despite having the same hydrogen-bonding motifs. The cocrystals were characterized by single-crystal X-ray diffraction (SC-XRD), powder X-ray diffraction (PXRD) and differential scanning calorimetry (DSC).
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Affiliation(s)
- Matthew Clarke Scheepers
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, Gauteng 2050, South Africa
| | - Andreas Lemmerer
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Private Bag 3, Johannesburg, Gauteng 2050, South Africa
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Kociołek-Balawejder E, Stanisławska E, Mucha I, Ociński D, Jacukowicz-Sobala I. Multifunctional Composite Materials Based on Anion Exchangers Modified with Copper Compounds-A Review of Their Synthesis Methods, Characteristics and Applications. Polymers (Basel) 2023; 15:3606. [PMID: 37688232 PMCID: PMC10490266 DOI: 10.3390/polym15173606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/21/2023] [Accepted: 08/26/2023] [Indexed: 09/10/2023] Open
Abstract
As copper and its compounds are of fundamental importance for the development of innovative materials, the synthesis of composites intended for water purification was undertaken in which submicron copper containing particles were dispersed within the matrix of a strongly basic anion exchanger, with a macroporous and gel-like structure. Due to their trimethylammonium functional groups, the host materials alone exhibited an affinity to anionic water contaminants and antimicrobial properties. The introduction of such particles as CuO, Cu2O, metallic Cu, CuO/FeO(OH), Cu4O3, Cu(OH)2, Cu4(OH)6SO4, Cu2(OH)3Cl increased these properties and demonstrated new properties. The composites were obtained unconventionally, in ambient conditions, using eco-friendly reagents. Alternative synthesis methods were compared and optimized, as a result of which a new group of hybrid ion exchangers was created (HIXs) containing 3.5-12.5 wt% of Cu. As the arrangement of the inorganic phase in the resin matrix was atypical, i.e., close to the surface of the beads, the obtained HIXs exhibited excellent kinetic properties in the process of oxidation and adsorption of As(III), as well as catalytic properties for the synthesis of triazoles via click reaction, and also antimicrobial properties in relation to Gram-positive Enterococcus faecalis and Gram-negative Pseudomonas aeruginosa and Escherichia coli, preventing biofilm formation. Using thermogravimetry, the effect of the inorganic phase on decomposition of the polymeric phase was evaluated for the first time and comprehensively, confirming the relationship and finding numerous regularities. It was also found that, depending on the oxidation state (CuO, Cu2O, Cu), copper-containing particles affected the textural properties of the polymeric phase endowing a tighter structure, limiting the porosity and reducing the affinity for water.
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Affiliation(s)
- Elżbieta Kociołek-Balawejder
- Department of Chemical Technology, Wroclaw University of Economics and Business, 53-345 Wrocław, Poland; (E.S.); (D.O.); (I.J.-S.)
| | - Ewa Stanisławska
- Department of Chemical Technology, Wroclaw University of Economics and Business, 53-345 Wrocław, Poland; (E.S.); (D.O.); (I.J.-S.)
| | - Igor Mucha
- Department of Basic Chemical Sciences, Wroclaw Medical University, 50-556 Wrocław, Poland;
| | - Daniel Ociński
- Department of Chemical Technology, Wroclaw University of Economics and Business, 53-345 Wrocław, Poland; (E.S.); (D.O.); (I.J.-S.)
| | - Irena Jacukowicz-Sobala
- Department of Chemical Technology, Wroclaw University of Economics and Business, 53-345 Wrocław, Poland; (E.S.); (D.O.); (I.J.-S.)
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30
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Liverić L, Holjevac Grgurić T, Mandić V, Chulist R. Influence of Manganese Content on Martensitic Transformation of Cu-Al-Mn-Ag Alloy. Materials (Basel) 2023; 16:5782. [PMID: 37687478 PMCID: PMC10488815 DOI: 10.3390/ma16175782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 08/19/2023] [Accepted: 08/22/2023] [Indexed: 09/10/2023]
Abstract
The influence of manganese content on the formation of martensite structure and the final properties of a quaternary Cu-Al-Mn-Ag shape memory alloy (SMA) was investigated. Two alloys with designed compositions, Cu- 9%wt. Al- 16%wt. Mn- 2%wt. Ag and Cu- 9%wt. Al- 7%wt. Mn- 2%wt. Ag, were prepared in an electric arc furnace by melting of high-purity metals. As-cast and quenched microstructures were determined by optical microscopy and scanning electron microscopy equipped with EDS. Phases were confirmed by high-energy synchrotron radiation and electron backscatter diffractions. Austenite and martensite transformations were followed by differential scanning calorimetry and hardness was determined using the Vickers hardness test. It was found that the addition of silver contributes to the formation of the martensite structure in the Cu-Al-Mn-SMA. In the alloy with 7%wt. of manganese, stable martensite is formed even in the as-cast state without additional heat treatment, while the alloy with 16%wt. of manganese martensite transforms only after thermal stabilization and quenching. Two types of martensite, β1' and γ1', are confirmed in the Cu-9Al-7Mn-2Ag specimen. The as-cast SMA with 7%wt. Mn showed significantly lower martensite transformation temperatures, Ms and Mf, in relation to the quenched alloy. With increasing manganese content, the Ms and Mf temperatures are shifted to higher values and the microhardness is lower.
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Affiliation(s)
- Lovro Liverić
- Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia;
| | | | - Vilko Mandić
- Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia;
| | - Robert Chulist
- Institute of Metallurgy and Materials Science, Polish Academy of Sciences, 25 Reymont Str., 30-059 Krakow, Poland;
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Zaharescu T, Dumitru A, Borbath T, Ionescu I, Borbath I, Boros TF. The Contribution of BaTiO 3 to the Stability Improvement of Ethylene-Propylene-Diene Rubber: Part II-Doped Filler. Polymers (Basel) 2023; 15:3441. [PMID: 37631498 PMCID: PMC10459972 DOI: 10.3390/polym15163441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Revised: 08/10/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023] Open
Abstract
The thermal and radiation stabilities of the formulations based on ethylene-propylene-diene rubber (EPDM), which contain barium titanate (BaTiO3) doped with lanthanum and cerium oxides, were investigated by chemiluminescence and mechanical testing. The contributions of these doped fillers are related to the surface interaction between the structural defects (doping atoms, i.e., lanthanum and cerium) implanted in the filler lattice and the molecular fragments formed during the progress of degradation. These composite materials present extended durabilities with respect to the references; the oxidation periods are a minimum of three times longer than the corresponding times for pristine polymers. This behavior is associated with the scavenging activity of dopants. Mechanical testing has demonstrated the contributions of doped filler to the improvement of tensile strength and elongation at break by the restructuration of the polymer phase. Scanning electron microscopy images revealed the densification of materials in the presence of doped barium titanates. All the investigations constitute valid proof for the qualification of BaTiO3 doped with Ce as the more efficient stabilizer compared to the same inorganic filler doped with La.
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Affiliation(s)
- Traian Zaharescu
- INCDIE ICPE CA, 313 Splaiul Unirii, 030138 Bucharest, Romania;
- ROSEAL SA, 5A Nicolae Balcescu, 535600 Odorheiu Secuiesc, Romania; (I.B.); (T.F.B.)
| | - Alina Dumitru
- INCDIE ICPE CA, 313 Splaiul Unirii, 030138 Bucharest, Romania;
| | - Tunde Borbath
- ROSEAL SA, 5A Nicolae Balcescu, 535600 Odorheiu Secuiesc, Romania; (I.B.); (T.F.B.)
| | - Ioana Ionescu
- ECOIND, 57-73 Drumul Podu Dambovitei, 060653 Bucharest, Romania;
| | - Istvan Borbath
- ROSEAL SA, 5A Nicolae Balcescu, 535600 Odorheiu Secuiesc, Romania; (I.B.); (T.F.B.)
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Kochelakov DV, Vikulova ES, Kuratieva NV, Korolkov IV. Potassium and Cesium Fluorinated β-Diketonates: Effect of a Cation and Terminal Substituent on Structural and Thermal Properties. Molecules 2023; 28:5886. [PMID: 37570856 PMCID: PMC10421003 DOI: 10.3390/molecules28155886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/02/2023] [Accepted: 08/03/2023] [Indexed: 08/13/2023] Open
Abstract
As potential precursors for the synthesis of fluoroperovskites, a family of heavy alkali metal (MI = K, Cs) fluorinated β-diketonates were prepared and characterized by elemental analysis, IR, and powder-XRD. The crystal structures of the new six complexes, MI(β-dikF)(H2O)X, X = 0 or 1, were also determined. The structural diversity of this poorly explored class of complexes was discussed, including the preferred types of cation polyhedra and the ligand coordination modes, and the thermal properties of the metal β-diketonates were studied by TG-DTA in an inert (He) atmosphere. The data obtained allowed us to reveal the effect of the metal cation and the terminal substituent on the structural and thermal features of this family of complexes.
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Affiliation(s)
- Danil V. Kochelakov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Acadademic Lavrentiev Ave 3, 630090 Novosibirsk, Russia;
| | - Evgeniia S. Vikulova
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Acadademic Lavrentiev Ave 3, 630090 Novosibirsk, Russia;
| | | | - Ilya V. Korolkov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, Acadademic Lavrentiev Ave 3, 630090 Novosibirsk, Russia;
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LaVan D, Yi F, Adams T, Tao R, Pelczar E, Xia H, Hu X, Sauerbrunn S, Matisons J. Abstracts of the 2023 49th Annual NATAS Conference. Polymers (Basel) 2023; 15:3250. [PMID: 37571144 PMCID: PMC10422470 DOI: 10.3390/polym15153250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 07/28/2023] [Indexed: 08/13/2023] Open
Abstract
We are pleased to announce that the 49th annual meeting of NATAS cwill be held in Rockville, MD, a beautiful city that is part of the Washington D.C. National Capital Area, on the DC metro system (allowing easy access to Washington museums and sites), and close to the National Institute of Standards and Technology (NIST), National Institutes of Health (NIH), Naval Research Laboratory (NRL), Army Research Laboratory (ARL), Johns Hopkins University Applied Physics Laboratory (JHU-APL), Naval Surface Warfare Center (NSWC), Georgetown University, George Washington University, George Mason University, and the University of Maryland. The North American Thermal Analysis Society is a venerable organization that offers scientists and practitioners the opportunity to explore the frontiers of thermal analysis, rheology, and materials characterization. The NATAS meeting always features new developments in the science of thermal analysis as well as applications of these techniques in a wide variety of fields. The meeting includes exhibits from vendors allowing for personalized attention and connecting with providers of instrumentation and software related to thermal analysis. The Society appreciates the financial support of the following contributing sponsors this year: NIST, Mettler-Toledo, TA Instruments, SETARAM, Anton Paar USA, MDPI AG, TAFDV, and QΔT Lab. Exhibitors include AKTS SA, Anton Paar USA, Mettler-Toledo, McCrone Microscopes & Accessories, NETZSCH Instruments North America, TA Instruments, and Thermtest, Inc.
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Affiliation(s)
- David LaVan
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Feng Yi
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | - Tina Adams
- The Lubrizol Corporation, Wickliffe, OH 44092, USA;
| | - Ran Tao
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
| | | | - Han Xia
- Eli Lilly and Co., Indianapolis, IN 46285, USA;
| | - Xiao Hu
- Department of Physics and Astronomy, College of Science and Mathematics, Rowan University, Glassboro, NJ 08028, USA;
| | - Stephen Sauerbrunn
- Center for Composite Materials, University of Delaware, Newark, DE 19716, USA;
| | - Janis Matisons
- Intertape Polymer Group Company, Marysville, MI 48040, USA;
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Pregi E, Romsics I, Várdai R, Pukánszky B. Interactions, Structure and Properties of PLA/lignin/PBAT Hybrid Blends. Polymers (Basel) 2023; 15:3237. [PMID: 37571133 PMCID: PMC10422597 DOI: 10.3390/polym15153237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Revised: 07/11/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
Poly(butylene adipate-co-terephthalate) (PBAT) was added to poly(lactic acid) (PLA)/lignin blends to decrease the considerable stiffness and brittleness of the blends. Two- and three-component blends were prepared in a wide composition range through homogenization in an internal mixer followed by compression molding. Interactions among the components were estimated by comparing the solubility parameters of the materials used and through thermal analysis. Mechanical properties were characterized by tensile testing. The structure of the blends was studied using scanning electron (SEM) and digital optical (DOM) microscopy. The results showed that the interactions between PBAT and lignin are somewhat stronger than those between PLA and the other two components. The maleic anhydride grafted PLA added as a coupling agent proved completely ineffective; it does not modify the interactions. The structural analysis confirmed the immiscibility of the components; the structure of the blends was heterogeneous at each composition. A dispersed structure formed when the concentration of one of the components was small, while, depending on lignin content, an interpenetrating network-like structure developed and phase inversion took place in the range of 30-60 vol% PBAT content. Lignin was located mainly in the PBAT phase. Properties were determined by the relative amount of PBAT and PLA; the addition of lignin deteriorated properties, mainly the deformability of the blends. Other means, such as reactive processing, must be used to improve compatibility and blend properties. The results contribute considerably to a better understanding of structure-property correlations in lignin-based hybrid blends.
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Affiliation(s)
- Emese Pregi
- Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary (B.P.)
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
| | - Imre Romsics
- Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary (B.P.)
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
| | - Róbert Várdai
- Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary (B.P.)
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
| | - Béla Pukánszky
- Laboratory of Plastics and Rubber Technology, Department of Physical Chemistry and Materials Science, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary (B.P.)
- Institute of Materials and Environmental Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
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Kim D, Lee H, Yun Y, Park J, Zhang X, Bae JH, Baang S. Analyzing Acceptor-like State Distribution of Solution-Processed Indium-Zinc-Oxide Semiconductor Depending on the In Concentration. Nanomaterials (Basel) 2023; 13:2165. [PMID: 37570484 PMCID: PMC10421299 DOI: 10.3390/nano13152165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/14/2023] [Accepted: 07/20/2023] [Indexed: 08/13/2023]
Abstract
Understanding the density of state (DOS) distribution in solution-processed indium-zinc-oxide (IZO) thin-film transistors (TFTs) is crucial for addressing electrical instability. This paper presents quantitative calculations of the acceptor-like state distribution of solution-processed IZO TFTs using thermal energy analysis. To extract the acceptor-like state distribution, the electrical characteristics of IZO TFTs with various In molarity ratios were analyzed with respect to temperature. An Arrhenius plot was used to determine electrical parameters such as the activation energy, flat band energy, and flat band voltage. Two calculation methods, the simplified charge approximation and the Meyer-Neldel (MN) rule-based carrier-surface potential field-effect analysis, were proposed to estimate the acceptor-like state distribution. The simplified charge approximation established the modeling of acceptor-like states using the charge-voltage relationship. The MN rule-based field-effect analysis validated the DOS distribution through the carrier-surface potential relationship. In addition, this study introduces practical and effective approaches for determining the DOS distribution of solution-processed IZO semiconductors based on the In molarity ratio. The profiles of the acceptor-like state distribution provide insights into the electrical behavior depending on the doping concentration of the solution-processed IZO semiconductors.
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Affiliation(s)
- Dongwook Kim
- School of Information Science, Hallym University, Chuncheon 24252, Republic of Korea; (D.K.); (H.L.); (J.P.)
| | - Hyeonju Lee
- School of Information Science, Hallym University, Chuncheon 24252, Republic of Korea; (D.K.); (H.L.); (J.P.)
| | - Youngjun Yun
- School of Nano Convergence Technology, Hallym University, Chuncheon 24252, Republic of Korea;
| | - Jaehoon Park
- School of Information Science, Hallym University, Chuncheon 24252, Republic of Korea; (D.K.); (H.L.); (J.P.)
- Department of Electronic Engineering, Hallym University, Chuncheon 24252, Republic of Korea
| | - Xue Zhang
- College of Ocean Science and Engineering, Shangdong University of Science and Technology, Qingdao 266590, China;
| | - Jin-Hyuk Bae
- School of Electronics Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
- School of Electronic and Electrical Engineering, Kyungpook National University, Daegu 41566, Republic of Korea
| | - Sungkeun Baang
- School of Information Science, Hallym University, Chuncheon 24252, Republic of Korea; (D.K.); (H.L.); (J.P.)
- Department of Electronic Engineering, Hallym University, Chuncheon 24252, Republic of Korea
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Pereira AG, Cassani L, Liu C, Li N, Chamorro F, Barreira JCM, Simal-Gandara J, Prieto MA. Camellia japonica Flowers as a Source of Nutritional and Bioactive Compounds. Foods 2023; 12:2825. [PMID: 37569093 PMCID: PMC10417519 DOI: 10.3390/foods12152825] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 07/03/2023] [Accepted: 07/13/2023] [Indexed: 08/13/2023] Open
Abstract
In recent decades, plants have strengthened their relevance as sources of molecules potentially beneficial for health. This underpinning effect also arises from the extensive research that has been conducted on plants that are typically undervalued, besides being scarcely used. This is the case with Camellia japonica in Galicia (NW Spain), where, despite its abundance, it is exclusively used for ornamental purposes and has been studied only for its proximate composition. Thus, the present study was conducted on several additional parameters in the flowers of eight C. japonica varieties. Our results show that camellia has a high nutritional value, with carbohydrates as the most abundant macronutrients followed by a moderate protein content (4.4-6.3 g/100 g dry weight) and high levels of polyunsaturated fatty acids (especially ω-3 fatty acids, which represent 12.9-22.7% of the total fatty acids), raising its potential for use for nutritional purposes. According to the thermochemical characterization and elemental composition of camellia, the raw material has poor mineralization and low nitrogen content, but high percentages of volatile matter and high carbon-fixation rates, making it a promising alternative for biofuel production. Furthermore, preliminary analysis reveals a high concentration of different bioactive compounds. As a result of these findings, camellias can be used as food or functional ingredients to improve the nutritional quality of food formulations.
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Affiliation(s)
- Antia G. Pereira
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, Universidade de Vigo, Ourense Campus, 32004 Ourense, Spain; (A.G.P.); (L.C.); (F.C.); (M.A.P.)
| | - Lucia Cassani
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, Universidade de Vigo, Ourense Campus, 32004 Ourense, Spain; (A.G.P.); (L.C.); (F.C.); (M.A.P.)
| | - Chao Liu
- Key Laboratory of Novel Food Resources Processing, Ministry of Agriculture and Rural Affairs/Key Laboratory of Agro-Products Processing Technology of Shandong Province/Institute of Agro-Food Science and Technology, Shandong Academy of Agricultural Sciences, Jinan 250000, China;
| | - Ningyang Li
- College of Food Science and Engineering, Ocean University of China, Qingdao 266005, China;
| | - Franklin Chamorro
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, Universidade de Vigo, Ourense Campus, 32004 Ourense, Spain; (A.G.P.); (L.C.); (F.C.); (M.A.P.)
| | - João C. M. Barreira
- Centro de Investigação de Montanha (CIMO), Instituto Politécnico de Bragança, Campus de Santa Apolonia, 5300-253 Bragança, Portugal
| | - Jesus Simal-Gandara
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, Universidade de Vigo, Ourense Campus, 32004 Ourense, Spain; (A.G.P.); (L.C.); (F.C.); (M.A.P.)
| | - Miguel A. Prieto
- Nutrition and Bromatology Group, Department of Analytical and Food Chemistry, Faculty of Food Science and Technology, Universidade de Vigo, Ourense Campus, 32004 Ourense, Spain; (A.G.P.); (L.C.); (F.C.); (M.A.P.)
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Lystsova EA, Novikov AS, Dmitriev MV, Maslivets AN, Khramtsova EE. Approach to Pyrido[2,1- b][1,3]benzothiazol-1-ones via In Situ Generation of Acyl(1,3-benzothiazol-2-yl)ketenes by Thermolysis of Pyrrolo[2,1- c][1,4]benzothiazine-1,2,4-triones. Molecules 2023; 28:5495. [PMID: 37513367 PMCID: PMC10385387 DOI: 10.3390/molecules28145495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 07/13/2023] [Accepted: 07/17/2023] [Indexed: 07/30/2023] Open
Abstract
Acyl(imidoyl)ketenes are highly reactive heterocumulenes that enable diversity-oriented synthesis of various drug-like heterocycles. Such ketenes, bearing heterocyclic substituents, afford angularly fused pyridin-2(1H)-ones in their [4+2]-cyclodimerization reactions. We have utilized this property for the development of a new synthetic approach to pharmaceutically interesting pyrido[2,1-b][1,3]benzothiazol-1-ones via the [4+2]-cyclodimerization of acyl(1,3-benzothiazol-2-yl)ketenes generated in situ. The thermal behaviors of 3-aroylpyrrolo[2,1-c][1,4]benzothiazine-1,2,4-triones and 3-benzoylpyrrolo[2,1-b][1,3]benzothiazole-1,2-dione (two new types of [e]-fused 1H-pyrrole-2,3-diones reported by us recently) have been studied by thermal analysis and HPLC to elucidate their capability to be a source of acyl(1,3-benzothiazol-2-yl)ketenes. As a result, we have found that only 3-aroylpyrrolo[2,1-c][1,4]benzothiazine-1,2,4-triones are suitable for this. The experimental results are supplemented with computational studies that demonstrate that thermolysis of 3-aroylpyrrolo[2,1-c][1,4]benzothiazine-1,2,4-triones proceeds through an unprecedented cascade of two thermal decarbonylations. Based on these studies, we discovered a novel mode of thermal transformation of [e]-fused 1H-pyrrole-2,3-diones and developed a new pot, atom, and step economic synthetic approach to pyrido[2,1-b][1,3]benzothiazol-1-ones. The synthesized drug-like pyrido[2,1-b][1,3]benzothiazol-1-ones are of interest to pharmaceutics, since their close analogs show significant antiviral activity.
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Affiliation(s)
- Ekaterina A Lystsova
- Department of Organic Chemistry, Perm State University, ul. Bukireva, 15, 614990 Perm, Russia
| | - Alexander S Novikov
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya nab. 7/9, 199034 St. Petersburg, Russia
- Research Institute of Chemistry, Рeoples' Friendship University of Russia (RUDN University), Miklukho-Maklaya Street, 6, 117198 Moscow, Russia
| | - Maksim V Dmitriev
- Department of Organic Chemistry, Perm State University, ul. Bukireva, 15, 614990 Perm, Russia
| | - Andrey N Maslivets
- Department of Organic Chemistry, Perm State University, ul. Bukireva, 15, 614990 Perm, Russia
| | - Ekaterina E Khramtsova
- Department of Organic Chemistry, Perm State University, ul. Bukireva, 15, 614990 Perm, Russia
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Abadel AA. Physical, Mechanical, and Microstructure Characteristics of Ultra-High-Performance Concrete Containing Lightweight Aggregates. Materials (Basel) 2023; 16:4883. [PMID: 37445196 DOI: 10.3390/ma16134883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 06/29/2023] [Accepted: 07/04/2023] [Indexed: 07/15/2023]
Abstract
This study explores and enhances the resistance of an ultra-high-performance concrete (UHPC) to explosive spalling under elevated temperatures. This study investigates the impact of lightweight aggregates (LWAs) on the mechanical and microstructural properties of the UHPC. Various UHPC specimens were created by replacing silica sand with LWAs in percentages ranging from 0% to 30%. The evaluation of these specimens involved assessing their compressive and flexural strengths, density, mass loss, shrinkage, porosity, and microstructural characteristics using scanning electron microscopy (SEM). This study provides valuable insights by analyzing the influence of lightweight aggregates on the strength, durability, and microstructure of UHPC. The results reveal that incorporating LWAs in the UHPC improved its flowability while decreasing its density, as the percentage of LWAs increased from 5% to 30%. Including 30% LWA resulted in a mass loss of 4.8% at 300 °C, which reduced the compressive and flexural strengths across all curing durations. However, the UHPC samples subjected to higher temperatures displayed higher strength than those exposed to ambient conditions. The microstructure analysis demonstrated that the UHPC specimens with 30% LWA exhibited increased density due to continuous hydration from the water in the lightweight aggregate. The pore size distribution graph indicated that incorporating more of the LWA increased porosity, although the returns diminished beyond a certain point. Overall, these findings offer valuable insights into the influence of lightweight aggregates on the physical and strength characteristics of UHPC. This research holds significant implications for developing high-performance, lightweight concrete materials.
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Affiliation(s)
- Aref A Abadel
- Department of Civil Engineering, College of Engineering, King Saud University, Riyadh 11421, Saudi Arabia
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Sato Y, Nagatoishi S, Noguchi S, Tsumoto K. Raman Spectroscopic Analysis of Highly-Concentrated Antibodies under the Acid-Treated Conditions. Pharm Res 2023; 40:1853-1864. [PMID: 37160850 PMCID: PMC10421790 DOI: 10.1007/s11095-023-03526-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 04/19/2023] [Indexed: 05/11/2023]
Abstract
PURPOSE Antibody drugs are usually formulated as highly-concentrated solutions, which would easily generate aggregates, resulting in loss of efficacy. Although low pH increases the colloidal dispersion of antibodies, acid denaturation can be an issue. Therefore, knowing the physical properties at low pH under high concentration conditions is important. METHODS Raman spectroscopy was used to investigate pH-induced conformational changes of antibodies at 50 mg/ml. Experiments in pH 3 to 7 were performed for human serum IgG and recombinant rituximab. RESULTS We detected the evident changes at pH 3 in Tyr and Trp bands, which are the sensitive markers of intermolecular interactions. Thermal transition analysis over the pH range demonstrated that the thermal transition temperature (Tm) was highest at pH 3. Acid-treated and neutralized one showed higher Tm than that of pH 7, indicating that their extent of intermolecular interactions correlated with the Tm values. Onset temperature was clearly different between concentrated and diluted samples. Colloidal analyses confirmed the findings of the Raman analysis. CONCLUSION Our studies demonstrated the positive correlation between Raman analysis and colloidal information, validating as a method for evaluating antibody conformation associated with aggregation propensities.
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Affiliation(s)
- Yusui Sato
- Analytical Instruments R&D Division, HORIBA, Ltd., Kanda Awaji-cho 2-6, Chiyoda-ku, Tokyo, 101-0063, Japan
| | - Satoru Nagatoishi
- The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
- Center for Drug Design Research, National Institutes of Biomedical Innovation, Health and Nutrition, 7-6-8 Saito-Asagi, Ibaraki City, Osaka, 567-0085, Japan.
| | - Shintaro Noguchi
- Bio·Life Science Center, HORIBA, Ltd., 2 Miyanohigashi, Kisshoin, Minami-ku, Kyoto, 601-8510, Japan
| | - Kouhei Tsumoto
- The Institute of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan.
- Center for Drug Design Research, National Institutes of Biomedical Innovation, Health and Nutrition, 7-6-8 Saito-Asagi, Ibaraki City, Osaka, 567-0085, Japan.
- Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
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40
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Terzi A, Gallo N, Sibillano T, Altamura D, Masi A, Lassandro R, Sannino A, Salvatore L, Bunk O, Giannini C, De Caro L. Travelling through the Natural Hierarchies of Type I Collagen with X-rays: From Tendons of Cattle, Horses, Sheep and Pigs. Materials (Basel) 2023; 16:4753. [PMID: 37445069 DOI: 10.3390/ma16134753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 06/21/2023] [Accepted: 06/28/2023] [Indexed: 07/15/2023]
Abstract
Type I collagen physiological scaffold for tissue regeneration is considered one of the widely used biomaterials for tissue engineering and medical applications. It is hierarchically organized: five laterally staggered molecules are packed within fibrils, arranged into fascicles and bundles. The structural organization is correlated to the direction and intensity of the forces which can be loaded onto the tissue. For a tissue-specific regeneration, the required macro- and microstructure of a suitable biomaterial has been largely investigated. Conversely, the function of multiscale structural integrity has been much less explored but is crucial for scaffold design and application. In this work, collagen was extracted from different animal sources with protocols that alter its structure. Collagen of tendon shreds excised from cattle, horse, sheep and pig was structurally investigated by wide- and small-angle X-ray scattering techniques, at both molecular and supramolecular scales, and thermo-mechanically with thermal and load-bearing tests. Tendons were selected because of their resistance to chemical degradation and mechanical stresses. The multiscale structural integrity of tendons' collagen was studied in relation to the animal source, anatomic location and source for collagen extraction.
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Affiliation(s)
- Alberta Terzi
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
| | - Nunzia Gallo
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
| | - Teresa Sibillano
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
| | - Davide Altamura
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
| | - Annalia Masi
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
| | - Rocco Lassandro
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
| | - Alessandro Sannino
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
| | - Luca Salvatore
- Department of Engineering for Innovation, University of Salento, 73100 Lecce, Italy
- Typeone Biomaterials Srl, Via Europa 167, 73021 Calimera, Italy
| | - Oliver Bunk
- Paul Scherrer Institute, 5232 Villigen PSI, Switzerland
| | - Cinzia Giannini
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
| | - Liberato De Caro
- Institute of Crystallography, National Research Council, 70125 Bari, Italy
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41
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Srebrenkoska S, Kochoski F, Srebrenkoska V, Risteska S, Kotynia R. Effect of Process Parameters on Thermal and Mechanical Properties of Filament Wound Polymer-Based Composite Pipes. Polymers (Basel) 2023; 15:2829. [PMID: 37447476 PMCID: PMC10346241 DOI: 10.3390/polym15132829] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 06/19/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023] Open
Abstract
The aim of this study was to investigate the mechanical and thermal properties of composite pipes based on epoxy resin and glass fibers produced by filament winding (FW) technology. Epoxy resins are widely used polymers in FW composite structures. The thermal characterization of the neat epoxy resin, curing, and post-curing characteristics for the determination of polymerization and glass transition temperature was performed, which is important for the mechanical properties of polymer composite pipes. In the present work, the applicability of the full factorial experimental design in predicting the hoop tensile and compressive strengths of glass fiber/epoxy resin composite pipes was investigated. The composite pipes in accordance with the 23 full factorial experimental design by using of three parameters and two levels of variation were prepared. The winding speed of the composites was taken to be the first factor, the second was the fiber tension, and the third was winding angle. To approximate the response, i.e., the mechanical properties of the composite pipes within the study domain, the first-order linear model with the interaction was used. The influence of each individual factor to the response function was established, as well as the influence of the interaction of the two and three factors. Additionally, those results were completed with the thermal characterization of the polymer composite pipes. From received results from mechanical and thermal characterization, it was concluded that the properties of composite specimens were highly affected by the analyzed parameters in filament winding technology. It was found that the estimated first-degree regression equation with the interaction gave a very good approximation of the experimental results of the hoop tensile and the compressive strengths of composite pipes within the study domain.
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Affiliation(s)
- Sara Srebrenkoska
- Faculty of Mechanical Engineering, Goce Delcev University, Krste Misirkov 10-A, P.O. Box 201, 2000 Stip, North Macedonia;
| | - Filip Kochoski
- Faculty of Technology, Goce Delcev University, Krste Misirkov 10-A, P.O. Box 201, 2000 Stip, North Macedonia;
| | - Vineta Srebrenkoska
- Faculty of Technology, Goce Delcev University, Krste Misirkov 10-A, P.O. Box 201, 2000 Stip, North Macedonia;
| | - Svetlana Risteska
- Institute for Advanced Composites and Robotics (IACR), 7500 Prilep, North Macedonia;
| | - Renata Kotynia
- Faculty of Civil Engineering, Architecture and Environmental Engineering, Lodz University of Technlogy (TUL), 93-590 Lodz, Poland;
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42
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Anis A, Alam M, Alhamidi A, Gupta RK, Tariq M, Al-Zahrani SM. Studies on Polybenzimidazole and Methanesulfonate Protic-Ionic-Liquids-Based Composite Polymer Electrolyte Membranes. Polymers (Basel) 2023; 15:2821. [PMID: 37447466 DOI: 10.3390/polym15132821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2023] [Revised: 06/19/2023] [Accepted: 06/22/2023] [Indexed: 07/15/2023] Open
Abstract
In the present work, different methanesulfonate-based protic ionic liquids (PILs) were synthesized and their structural characterization was performed using FTIR, 1H, and 13C NMR spectroscopy. Their thermal behavior and stability were studied using DSC and TGA, respectively, and EIS was used to study the ionic conductivity of these PILs. The PIL, which was diethanolammonium-methanesulfonate-based due to its compatibility with polybenzimidazole (PBI) to form composite membranes, was used to prepare proton-conducting polymer electrolyte membranes (PEMs) for prospective high-temperature fuel cell application. The prepared PEMs were further characterized using FTIR, DSC, TGA, SEM, and EIS. The FTIR results indicated good interaction among the PEM components and the DSC results suggested good miscibility and a plasticizing effect of the incorporated PIL in the PBI polymer matrix. All the PEMs showed good thermal stability and good proton conductivity for prospective high-temperature fuel cell application.
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Affiliation(s)
- Arfat Anis
- SABIC Polymer Research Center (SPRC), Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
| | - Manawwer Alam
- Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Saudi Arabia
| | - Abdullah Alhamidi
- SABIC Polymer Research Center (SPRC), Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
| | - Ravindra Kumar Gupta
- King Abdullah Institute for Nanotechnology, King Saud University, Riyadh 11451, Saudi Arabia
| | - Mohammad Tariq
- LAQV, REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2829-516 Caparica, Portugal
| | - Saeed M Al-Zahrani
- SABIC Polymer Research Center (SPRC), Chemical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
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Smejda-Krzewicka A, Mrozowski K, Strzelec K. Interelastomer Reactions Occurring during the Cross-Linking of Hydrogenated Acrylonitrile-Butadiene (HNBR) and Chloroprene (CR) Rubbers Blends in the Presence of Silver(I) Oxide (Ag 2O) and Mechanical Properties of Cured Products. Materials (Basel) 2023; 16:4573. [PMID: 37444887 PMCID: PMC10342298 DOI: 10.3390/ma16134573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 06/15/2023] [Accepted: 06/20/2023] [Indexed: 07/15/2023]
Abstract
The purpose of this paper was to examine the possibility of producing new blends of hydrogenated acrylonitrile-butadiene and chloroprene rubbers (HNBR/CR) unconventionally cross-linked with silver(I) oxide (Ag2O), and to investigate the physicomechanical properties of the obtained materials. From the obtained results, it can be concluded that HNBR/CR composites were effectively cured with Ag2O, which led to interelastomer reactions, and the degree of binding of HNBR with CR was in the range of 14-59%. The rheometric and equilibrium swelling studies revealed that the cross-linking progress depended on the weight proportion of both elastomers, and the degree of cross-linking was greater with more content of chloroprene rubber in the tested blends. Interelastomer reactions occurring between HNBR and CR improved the homogeneity and miscibility of the tested compositions, which was confirmed by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) analyses. The tensile strength and hardness of the obtained HNBR/CR/Ag2O vulcanizates proportionally increased with the content of CR, while the tear strength showed an inverse relationship. The obtained new, unconventional materials were characterized by significant resistance to thermo-oxidative factors, which was confirmed by the high aging factor.
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Affiliation(s)
- Aleksandra Smejda-Krzewicka
- Institute of Polymer and Dye Technology, Lodz University of Technology, Stefanowskiego Street 16, 90-537 Lodz, Poland; (K.M.); (K.S.)
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Lemercier A, Couvrat N, Cartigny Y, Sanselme M, Corvis Y, Espeau P, Coquerel G. Evidence of a New Crystalline Phase of Prednisolone Obtained from the Study of the Hydration-Dehydration Mechanisms of the Sesquihydrate. Pharmaceutics 2023; 15:1694. [PMID: 37376142 DOI: 10.3390/pharmaceutics15061694] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 05/26/2023] [Accepted: 06/02/2023] [Indexed: 06/29/2023] Open
Abstract
The dehydration of prednisolone sesquihydrate is studied and characterized by different physico-chemical analysis methods. The meticulous study of this dehydration led to the highlighting of a new solid form (form 3), metastable, never identified before. In a second step, the rehydration of anhydrous forms 1 and 2 of prednisolone is studied, in particular by Dynamic Vapor Sorption. It is then demonstrated that neither of the two forms is sensitive to humidity. By means of solid-gas equilibria, the sesquihydrate can only be obtainable from the isomorphic anhydrous form. Finally, a classification of the sesquihydrate is made, taking into account, in particular, the activation energy determined during dehydration.
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Affiliation(s)
| | - Nicolas Couvrat
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
| | - Yohann Cartigny
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
| | | | - Yohann Corvis
- CNRS, INSERM, UTCBS, Chemical and Biological Technologies for Health Group, Université Paris Cité, 75006 Paris, France
| | - Philippe Espeau
- CNRS, INSERM, UTCBS, Chemical and Biological Technologies for Health Group, Université Paris Cité, 75006 Paris, France
| | - Gérard Coquerel
- SMS, UR 3233, Université Rouen Normandie, 76000 Rouen, France
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Brandt J, Kanaki E, Fischer D, Herm C. Evaluation of the Composition, Thermal and Mechanical Behavior, and Color Changes of Artificially and Naturally Aged Polymers for the Conservation of Stained Glass Windows. Polymers (Basel) 2023; 15:2595. [PMID: 37376241 DOI: 10.3390/polym15122595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 05/23/2023] [Accepted: 05/29/2023] [Indexed: 06/29/2023] Open
Abstract
Investigations of historical conservation materials on historical stained glass windows of the Naumburg Cathedral in Germany offered an opportunity for the study of polymers, naturally aged in a non-controlled environment. This allowed the conservation history of the cathedral to be traced and expanded by valuable insights. The historical materials were characterized through the use of spectroscopy (FTIR, Raman), thermal analysis, PY-GC/MS, and SEC on taken samples. The analyses show that acrylate resins were predominantly used for conservation. The lamination material from the 1940s is particularly noteworthy. Epoxy resins were also identified in isolated cases. Artificial aging was used to investigate the influence of environmental influences on the properties of the identified materials. Through a multi-stage aging program, influences of UV radiation, high temperatures and high humidity can be considered in isolation. Piaflex F20, Epilox, Paraloid B72 as a modern material and combinations of Paraloid B72/diisobutyl phthalate and PMA/diisobutyl phthalate were investigated. The parameters yellowing, FTIR spectra, Raman spectra, molecular mass and conformation, glass transition temperature, thermal behavior, and adhesive strength on glass were determined. The effects of the environmental parameters on the investigated materials are differentiated. UV and extreme temperatures tend to show a stronger influence than humidity. The comparison of the artificially aged samples with the naturally aged samples from the cathedral shows that the latter were less aged. Recommendations for the conservation of the historical stained glass windows were derived from the results of the investigation.
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Affiliation(s)
- Josef Brandt
- Center Macromolecular Structure Analysis, Institute of Macromolecular Chemistry, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | - Elisavet Kanaki
- Center Macromolecular Structure Analysis, Institute of Macromolecular Chemistry, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | - Dieter Fischer
- Center Macromolecular Structure Analysis, Institute of Macromolecular Chemistry, Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany
| | - Christoph Herm
- Study Program of Restoration, Dresden University of Fine Arts, 01307 Dresden, Germany
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Freitas-Marques MBD, Valle TSD, Araujo BCRD, Sebastião RDCDO, Mussel WDN, Yoshida MI, Fernandes C. Thermal energy and tableting effects in benznidazole product: the impacts of industrial processing. Drug Dev Ind Pharm 2023:1-26. [PMID: 37278581 DOI: 10.1080/03639045.2023.2222180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
OBJECTIVE The investigation of benznidazole (BZN), excipients, and tablets aims to evaluate their thermal energy and tableting effects. They aim to understand better the molecular and pharmaceutical processing techniques of the formulation. SIGNIFICANCE The Product Quality Review, part of Good Manufacturing Practices, is essential to highlight trends and identify product and process improvements. METHODS A set of technique approaches, infrared spectroscopy, X-ray diffraction, and thermal analysis with isoconversional kinetic study, were applied in the protocol. RESULTS X-ray experiments suggest talc and α-lactose monohydrate dehydration and conversion of β-lactose to stable α-lactose upon tableting. The signal crystallization at 167 °C in the DSC curve confirmed this observation. A calorimetric study showed a decrease in the thermal stability of BZN tablets. Therefore, the temperature is a critical process parameter. The specific heat capacity (Cp) of BZN, measured by DSC, was 10.04 J/g at 25 °C and 9.06 J/g at 160 °C. Thermal decomposition required 78 kJ mol-1. Compared with the tablet (about 200 kJ mol-1), the necessary energy is two-fold lower, as observed in the kinetic study by non-isothermal TG experiment at 5; 7.5; 10; and 15 °C min-1. CONCLUSIONS These results indicate the necessity of considering the thermal energy and tableting effects of BZN manufacturing, which contributes significantly to the molecular mechanistic understanding of this drug delivery system.
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Affiliation(s)
- Maria Betânia de Freitas-Marques
- Laboratório de Controle de Qualidade de Medicamentos e Cosméticos, Faculdade de Farmácia - Universidade Federal de Minas Gerais
- Departamento de Química, Instituto de Ciências Exatas, - Universidade Federal de Minas Gerais. Av. Antônio Carlos, 6627, Pampulha, Zip-code: 31270-901, Belo Horizonte - Minas Gerais - Brazil
| | - Talita Santos do Valle
- Laboratório de Controle de Qualidade de Medicamentos e Cosméticos, Faculdade de Farmácia - Universidade Federal de Minas Gerais
| | - Bárbara Caroline Rodrigues de Araujo
- Departamento de Química, Instituto de Ciências Exatas, - Universidade Federal de Minas Gerais. Av. Antônio Carlos, 6627, Pampulha, Zip-code: 31270-901, Belo Horizonte - Minas Gerais - Brazil
| | - Rita de Cássia de Oliveira Sebastião
- Departamento de Química, Instituto de Ciências Exatas, - Universidade Federal de Minas Gerais. Av. Antônio Carlos, 6627, Pampulha, Zip-code: 31270-901, Belo Horizonte - Minas Gerais - Brazil
| | - Wagner da Nova Mussel
- Departamento de Química, Instituto de Ciências Exatas, - Universidade Federal de Minas Gerais. Av. Antônio Carlos, 6627, Pampulha, Zip-code: 31270-901, Belo Horizonte - Minas Gerais - Brazil
| | - Maria Irene Yoshida
- Departamento de Química, Instituto de Ciências Exatas, - Universidade Federal de Minas Gerais. Av. Antônio Carlos, 6627, Pampulha, Zip-code: 31270-901, Belo Horizonte - Minas Gerais - Brazil
| | - Christian Fernandes
- Laboratório de Controle de Qualidade de Medicamentos e Cosméticos, Faculdade de Farmácia - Universidade Federal de Minas Gerais
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Dony P, Berzin F. Thermogravimetric, Morphological and Infrared Analysis of Blends Involving Thermoplastic Starch and Poly(ethylene-co-methacrylic acid) and Its Ionomer Form. Molecules 2023; 28:molecules28114519. [PMID: 37298994 DOI: 10.3390/molecules28114519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 05/26/2023] [Accepted: 05/27/2023] [Indexed: 06/12/2023] Open
Abstract
This study focuses on the thermal properties and structural features of blends consisting of thermoplastic starch (TPS) and poly(ethylene-co-methacrylic acid) copolymer (EMAA) or its ionomer form (EMAA-54Na). The aim is to investigate how carboxylate functional groups of the ionomer form intervene in blends compatibility at the interface of the two materials and how this impacts their properties. Two series of blends (TPS/EMAA and TPS/EMAA-54Na) were produced with an internal mixer, with TPS compositions between 5 and 90 wt%. Thermogravimetry shows two main weight losses, indicating that TPS and the two copolymers are primarily immiscible. However, a small weight loss existing at intermediate degradation temperature between those of the two pristine components reveals specific interactions at the interface. At a mesoscale level, scanning electron microscopy confirmed thermogravimetry results and showed a two-phase domain morphology, with a phase inversion at around 80 wt% TPS, but also revealed a different surface appearance evolution between the two series. Fourier-transformed infrared spectroscopy analysis also revealed discrepancies in fingerprint between the two series of blends, analysed in terms of additional interactions in TPS/EMAA-54Na coming from the supplementary sodium neutralized carboxylate functions of the ionomer.
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Affiliation(s)
- Philippe Dony
- Institue de Thermique, Mécanique et Matériaux (ITheMM), Université de Reims Champagne Ardenne, EA 7548, CEDEX 2, 51687 Reims, France
| | - Françoise Berzin
- Fractionnement des AgroRessources et Environnement (FARE), Université de Reims Champagne Ardenne, INRAE, UMR 0614, 51100 Reims, France
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48
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de Santana ÉC, da Silva WF, Grosso Lima M, Ribeiro Pereira G, Riffel DB. Three-Dimensional Printed Subsurface Defect Detection by Active Thermography Data-Processing Algorithm. 3D Print Addit Manuf 2023; 10:420-427. [PMID: 37346194 PMCID: PMC10280207 DOI: 10.1089/3dp.2021.0172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/23/2023]
Abstract
This article evaluates an active thermography algorithm to detect subsurface defects in materials made by additive manufacturing (AM). It is based on the techniques of thermographic signal reconstruction (TSR), thermal contrast, and the physical principles of heat transfer. The subsurface defects have different infill, depth, and size. The results obtained from this algorithm are compared with state-of-the-art TSR technique and show the high performance of the proposed algorithm even for subsurface defects done by 3D AM. The resulting images are better shown using the absolute difference in the place of variance. The proposed algorithm has higher contrast, better sensitivity to the defect depths, and lower noise than the TSR. The resultant image is quite clean and gives no doubt where the subsurface defects are.
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Affiliation(s)
| | | | - Marcella Grosso Lima
- Non-Destructive Testing, Corrosion and Welding Laboratory, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gabriela Ribeiro Pereira
- Non-Destructive Testing, Corrosion and Welding Laboratory, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
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Makinde OD, Makinde AE. Thermal Analysis of a Reactive Variable Viscosity TiO 2-PAO Nanolubricant in a Microchannel Poiseuille Flow. Micromachines (Basel) 2023; 14:1164. [PMID: 37374749 DOI: 10.3390/mi14061164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2023] [Revised: 05/25/2023] [Accepted: 05/28/2023] [Indexed: 06/29/2023]
Abstract
This paper examines the flow structure and heat transfer characteristics of a reactive variable viscosity polyalphaolefin (PAO)-based nanolubricant containing titanium dioxide (TiO2) nanoparticles in a microchannel. The nonlinear model equations are obtained and numerically solved via the shooting method with Runge-Kutta-Fehlberg integration scheme. Pertinent results depicting the effects of emerging thermophysical parameters on the reactive lubricant velocity, temperature, skin friction, Nusselt number and thermal stability criteria are presented graphically and discussed. It is found that the Nusselt number and thermal stability of the flow process improve with exothermic chemical kinetics, Biot number, and nanoparticles volume fraction but lessen with a rise in viscous dissipation and activation energy.
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Affiliation(s)
- Oluwole Daniel Makinde
- Faculty of Military Science, Stellenbosch University, Private Bag X2, Saldanha 7395, South Africa
| | - Anuoluwa Esther Makinde
- Faculty of Engineering, Stellenbosch University, Private Bag X1, Matieland 7602, South Africa
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50
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Diaz JCCA, Muccillo ENDS, Muccillo R. Porous 8YSZ Ceramics Prepared with Alkali Halide Sacrificial Additives. Materials (Basel) 2023; 16:ma16093509. [PMID: 37176391 PMCID: PMC10180457 DOI: 10.3390/ma16093509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 04/27/2023] [Accepted: 04/28/2023] [Indexed: 05/15/2023]
Abstract
8 mol% Y2O3-stabilized ZrO2 (8YSZ) ceramics were prepared with KCl and LiF additions to obtain porous specimens with high skeletal density. Thermogravimetric and differential thermal analyses (TG/DTA) were carried out on 8YSZ and on 8YSZ mixed to 5 wt.% KCl or 5 wt.% LiF as sacrificial pore formers that were thermally removed during sintering. The melting and evaporation of the alkali halides were evaluated by differential thermal analysis. Dilatometric analysis was also carried out following the same TG/DTA temperature profile with results suggesting rearrangement of the 8YSZ particles during LiF and KCl melting. The dilatometric data of 8YSZ green pellets mixed to KCl or LiF exhibited an initial expansion up to the melting of the alkali halide, followed by shrinkage due to sintering evolution with grain growth and pore elimination. The time that the alkali halide molten phase was kept during sintering was found to be an important parameter for obtaining 8YSZ-sintered specimens with specific pore content; bulk density and open porosity could then be tuned by controlling the time the alkali halide remained liquid during sintering. Scanning electron microscopy images of the pellet fracture surfaces showed pores that contributed to increasing the electrical resistivity as evaluated by impedance spectroscopy analysis.
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Affiliation(s)
| | | | - Reginaldo Muccillo
- Center of Science and Technology of Materials-CCTM, Energy and Nuclear Research Institute-IPEN, Sao Paulo 05508-170, SP, Brazil
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