1
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Beyerlein GS, Ratke L. Structural Features of the Porous Network of Poly(Urethane) Aerogels via Gas Permeability Measurements. Macromol Rapid Commun 2024:e2400014. [PMID: 38575152 DOI: 10.1002/marc.202400014] [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: 01/08/2024] [Revised: 03/15/2024] [Indexed: 04/06/2024]
Abstract
The permeability for gases through polyurethane (PUR) aerogels prepared from unsorted PUR scraps by means of a recycling technique is measured with a dynamic pressure method. The permeabilities are in the range of 10-15 to 10-13 m2 and thus reflect the pore morphology observed with scanning electron microscopy. The permeability depends on the envelope density and microstructural features of the aerogels and decreases with increasing inner surface area. The comparison of the permeability with the Porod constant, which is obtained independently via small-angle X-ray scattering (SAXS), yields a high consistency with the expected theoretical relationship. However, a calculation of inner surface area based on permeability yields lower results than expected from data based on the established SAXS technique, revealing that the famous Carman-Kozeny law correlates only by trend, which is attributed to additional gas transport through the micro- and mesopores. A possible approach for the correlation of this behavior to the tortuosity is given. Several models accounting for the combined action of viscous flow, Knudsen diffusion, and molecular slip along pore walls are fitted to the experimental data, effectively qualifying the permeability measurement as time-efficient and inexpensive technique for the characterization of structural features of aerogels.
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Affiliation(s)
| | - Lorenz Ratke
- 53757, Sankt Augustin, Northrhine-Westphalia, Germany
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2
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Usseglio J, Dumur A, Pagès E, Renaudie É, Abélanet A, Brie J, Champion É, Magnaudeix A. Microporous Hydroxyapatite-Based Ceramics Alter the Physiology of Endothelial Cells through Physical and Chemical Cues. J Funct Biomater 2023; 14:460. [PMID: 37754874 PMCID: PMC10531673 DOI: 10.3390/jfb14090460] [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: 07/20/2023] [Revised: 08/15/2023] [Accepted: 08/22/2023] [Indexed: 09/28/2023] Open
Abstract
Incorporation of silicate ions in calcium phosphate ceramics (CPC) and modification of their multiscale architecture are two strategies for improving the vascularization of scaffolds for bone regenerative medicine. The response of endothelial cells, actors for vascularization, to the chemical and physical cues of biomaterial surfaces is little documented, although essential. We aimed to characterize in vitro the response of an endothelial cell line, C166, cultivated on the surface CPCs varying either in terms of their chemistry (pure versus silicon-doped HA) or their microstructure (dense versus microporous). Adhesion, metabolic activity, and proliferation were significantly altered on microporous ceramics, but the secretion of the pro-angiogenic VEGF-A increased from 262 to 386 pg/mL on porous compared to dense silicon-doped HA ceramics after 168 h. A tubulogenesis assay was set up directly on the ceramics. Two configurations were designed for discriminating the influence of the chemistry from that of the surface physical properties. The formation of tubule-like structures was qualitatively more frequent on dense ceramics. Microporous ceramics induced calcium depletion in the culture medium (from 2 down to 0.5 mmol/L), which is deleterious for C166. Importantly, this effect might be associated with the in vitro static cell culture. No influence of silicon doping of HA on C166 behavior was detected.
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Affiliation(s)
| | | | | | | | | | | | | | - Amandine Magnaudeix
- Université de Limoges, CNRS, Institut de Recherche sur les Céramiques, UMR 7315, F-87000 Limoges, France; (J.U.); (A.D.); (E.P.); (É.R.); (A.A.); (J.B.); (É.C.)
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3
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Mighri R, Turani-I-Belloto K, Demirci UB, Alauzun JG. Nanostructured Carbon-Doped BN for CO 2 Capture Applications. Nanomaterials (Basel) 2023; 13:2389. [PMID: 37686897 PMCID: PMC10490533 DOI: 10.3390/nano13172389] [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: 07/01/2023] [Revised: 07/26/2023] [Accepted: 08/02/2023] [Indexed: 09/10/2023]
Abstract
Carbon-doped boron nitride (denoted by BN/C) was prepared through the pyrolysis at 1100 °C of a nanostructured mixture of an alkyl amine borane adduct and ammonia borane. The alkyl amine borane adduct acts as a soft template to obtain nanospheres. This bottom-up approach for the synthesis of nanostructured BN/C is relatively simple and compelling. It allows the structure obtained during the emulsion process to be kept. The final BN/C materials are microporous, with interconnected pores in the nanometer range (0.8 nm), a large specific surface area of up to 767 m2·g-1 and a pore volume of 0.32 cm3·g-1. The gas sorption studied with CO2 demonstrated an appealing uptake of 3.43 mmol·g-1 at 0 °C, a high CO2/N2 selectivity (21) and 99% recyclability after up to five adsorption-desorption cycles.
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Affiliation(s)
- Rimeh Mighri
- Institut Charles Gerhardt, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Kevin Turani-I-Belloto
- Institut Europeen des Membranes, IEM—UMR 5635, Univ Montpellier, ENSCM, CNRS, 34095 Montpellier, France
| | - Umit B. Demirci
- Institut Europeen des Membranes, IEM—UMR 5635, Univ Montpellier, ENSCM, CNRS, 34095 Montpellier, France
| | - Johan G. Alauzun
- Institut Charles Gerhardt, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
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4
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Guo H, Li F, Shui X, Wang J, Fang C, Zhu L. Ultrathin Polyamide Nanofilms with Controlled Microporosity for Enhanced Solvent Permeation. ACS Appl Mater Interfaces 2023. [PMID: 37479673 DOI: 10.1021/acsami.3c07440] [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: 07/23/2023]
Abstract
Organic solvent nanofiltration (OSN) technology shows reduced energy consumption by almost 90% with great potential in achieving low-carbon separation applications. Polyamide nanofilms with controlled intrinsic and extrinsic structures (e.g., thickness and porosity) are important for achieving such a goal but are technically challenging. Herein, ultrathin polyamide nanofilms with controlled microporosity and morphology were synthesized via a molecular layer deposition method for OSN. The key is that the polyamide synthesis is controlled in a homogenous organic phase, rather than an interface, not only involving no monomer kinetic diffusion but also broadening the applicability of amine monomers. The particular nonplanar and rigid amine monomers were superbly used to increase microporosity and the nanofilm was linearly controlled at the nanometer scale to decrease thickness. The composite membrane with the polyamide nanofilms as separation layers displayed highly superior performance to current counterparts. The ethanol and methanol permeances were up to 5.5 and 14.6 L m-2 h-1 bar-1, respectively, but the molecular weight cutoff was tailored as low as 300 Da. Such separation performance remained almost unchanged during a long-term operation. This work demonstrates a promising alternative that could synergistically control the physicochemical structures of ultrathin selective layers to fabricate high-performance OSN membranes for efficient separations.
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Affiliation(s)
- Hukang Guo
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, P.R. China
- MOE Engineering Research Center of Membrane and Water Treatment Technology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Fupeng Li
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, P.R. China
- MOE Engineering Research Center of Membrane and Water Treatment Technology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Xuerong Shui
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, P.R. China
- MOE Engineering Research Center of Membrane and Water Treatment Technology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Jianyu Wang
- Center for Healthcare Materials, Shaoxing Institute, Zhejiang University, Shaoxing 312000, China
| | - Chuanjie Fang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, P.R. China
- MOE Engineering Research Center of Membrane and Water Treatment Technology, Zhejiang University, Hangzhou 310058, P.R. China
| | - Liping Zhu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310058, P.R. China
- MOE Engineering Research Center of Membrane and Water Treatment Technology, Zhejiang University, Hangzhou 310058, P.R. China
- Center for Healthcare Materials, Shaoxing Institute, Zhejiang University, Shaoxing 312000, China
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5
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Ge R, Boyce AM, Sun Y, Shearing PR, Grant PS, Cumming DJ, Smith RM. Numerical Design of Microporous Carbon Binder Domains Phase in Composite Cathodes for Lithium-Ion Batteries. ACS Appl Mater Interfaces 2023. [PMID: 37256681 DOI: 10.1021/acsami.3c00998] [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] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Lithium-ion battery (LIB) performance can be significantly affected by the nature of the complex electrode microstructure. The carbon binder domain (CBD) present in almost all LIB electrodes is used to enhance mechanical stability and facilitate electronic conduction, and understanding the CBD phase microstructure and how it affects the complex coupled transport processes is crucial to LIB performance optimization. In this work, the influence of microporosity in the CBD phase has been studied in detail for the first time, enabling insight into the relationships between the CBD microstructure and the battery performance. To investigate the effect of the CBD pore size distributions, a random field method is used to generate in silico a multiple-phase electrode structure, including bimodal pore size distributions seen in practice and microporous CBD with a tunable pore size and variable transport properties. The distribution of macropores and the microporous CBD phase substantially affected simulated battery performance, where battery specific capacity improved as the microporosity of the CBD phase increased.
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Affiliation(s)
- Ruihuan Ge
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield S10 2TN, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
| | - Adam M Boyce
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London WC1E 7JE, UK
- School of Mechanical and Materials Engineering, University College Dublin, Dublin 4, Ireland
| | - Yige Sun
- Department of Materials, University of Oxford, Oxford OX1 3PH, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
| | - Paul R Shearing
- Electrochemical Innovation Lab, Department of Chemical Engineering, University College London, London WC1E 7JE, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
| | - Patrick S Grant
- Department of Materials, University of Oxford, Oxford OX1 3PH, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
| | - Denis J Cumming
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield S10 2TN, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
| | - Rachel M Smith
- Department of Chemical and Biological Engineering, The University of Sheffield, Sheffield S10 2TN, UK
- The Faraday Institution, Quad One, Harwell Science and Innovation Campus, Didcot OX11 0RA, UK
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6
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Cañas-Gutiérrez A, Toro L, Fornaguera C, Borrós S, Osorio M, Castro-Herazo C, Arboleda-Toro D. Biomineralization in Three-Dimensional Scaffolds Based on Bacterial Nanocellulose for Bone Tissue Engineering: Feature Characterization and Stem Cell Differentiation. Polymers (Basel) 2023; 15:polym15092012. [PMID: 37177163 PMCID: PMC10181035 DOI: 10.3390/polym15092012] [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: 02/24/2023] [Revised: 03/30/2023] [Accepted: 04/04/2023] [Indexed: 05/15/2023] Open
Abstract
Bacterial nanocellulose (BNC) has a negative surface charge in physiological environments, which allows the adsorption of calcium ions to initiate the nucleation of different calcium phosphate phases. The aim of this study was to investigate different methods of mineralization in three-dimensional microporous bacterial nanocellulose with the intention of mimicking the composition, structure, and biomechanical properties of natural bone. To generate the 3D microporous biomaterial, porogen particles were incorporated during BNC fermentation with the Komagataeibacter medellinensis strain. Calcium phosphates (CPs) were deposited onto the BNC scaffolds in five immersion cycles, alternating between calcium and phosphate salts in their insoluble forms. Scanning electron microscopy (SEM) showed that the scaffolds had different pore sizes (between 70 and 350 µm), and their porous interconnectivity was affected by the biomineralization method and time. The crystals on the BNC surface were shown to be rod-shaped, with a calcium phosphate ratio similar to that of immature bone, increasing from 1.13 to 1.6 with increasing cycle numbers. These crystals also increased in size with an increasing number of cycles, going from 25.12 to 35.9 nm. The main mineral phase observed with X-ray diffraction was octacalcium dihydrogen hexakis phosphate (V) pentahydrate (OCP). In vitro studies showed good cellular adhesion and high cell viability (up to 95%) with all the scaffolds. The osteogenic differentiation of human bone marrow mesenchymal stem cells on the scaffolds was evaluated using bone expression markers, including alkaline phosphatase, osteocalcin, and osteopontin. In conclusion, it is possible to prepare 3D BNC scaffolds with controlled microporosity that allow osteoblast adhesion, proliferation, and differentiation.
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Affiliation(s)
- Ana Cañas-Gutiérrez
- Research Group on New Materials (GINUMA), Faculty of Engineering, Universidad Pontificia Bolivariana, Circular 1 No. 70-01, Medellín 050031, Colombia
| | - Lenka Toro
- Biomedical Engineering Research Group (GIBEC), EIA University, Km 2 + 200 on the Way to the José María Córdova Airport, Alto de Las Palmas, Envigado 055428, Colombia
- Cancer Research Institute, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, 84505 Bratislava, Slovakia
| | - Cristina Fornaguera
- Grup d'Enginyeria de Materials (Gemat), Institut Químic de Sarrià (IQS), Universitat Ramon Llull (URL), Via Augusta 390, 08017 Barcelona, Spain
| | - Salvador Borrós
- Grup d'Enginyeria de Materials (Gemat), Institut Químic de Sarrià (IQS), Universitat Ramon Llull (URL), Via Augusta 390, 08017 Barcelona, Spain
| | - Marlon Osorio
- Research Group on New Materials (GINUMA), Faculty of Engineering, Universidad Pontificia Bolivariana, Circular 1 No. 70-01, Medellín 050031, Colombia
| | - Cristina Castro-Herazo
- Research Group on New Materials (GINUMA), Faculty of Engineering, Universidad Pontificia Bolivariana, Circular 1 No. 70-01, Medellín 050031, Colombia
| | - David Arboleda-Toro
- Group of Biosocial Studies of the Body-EBSC-, Faculty of Dentistry, Universidad de Antioquia Calle 64 No. 52-59, Medellín 050010, Colombia
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7
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Frías M, Monasterio M, Moreno-Juez J. Physical and Mechanical Behavior of New Ternary and Hybrid Eco-Cements Made from Construction and Demolition Waste. Materials (Basel) 2023; 16:3093. [PMID: 37109930 PMCID: PMC10143356 DOI: 10.3390/ma16083093] [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] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2023] [Revised: 04/11/2023] [Accepted: 04/12/2023] [Indexed: 06/19/2023]
Abstract
Construction and demolition waste (CDW) currently constitutes a waste stream with growing potential use as a secondary raw material in the manufacture of eco-cements that offer smaller carbon footprints and less clinker content than conventional cements. This study analyzes the physical and mechanical properties of two different cement types, ordinary Portland cement (OPC) and calcium sulfoaluminate (CSA) cement, and the synergy between them. These cements are manufactured with different types of CDW (fine fractions of concrete, glass and gypsum) and are intended for new technological applications in the construction sector. This paper addresses the chemical, physical, and mineralogical characterization of the starting materials, as well as the physical (water demand, setting time, soundness, water absorption by capillary action, heat of hydration, and microporosity) and mechanical behavior of the 11 cements selected, including the two reference cements (OPC and commercial CSA). From the analyses obtained, it should be noted that the addition of CDW to the cement matrix does not modify the amount of water by capillarity with respect to OPC cement, except for Labo CSA cement which increases by 15.7%, the calorimetric behavior of the mortars is different depending on the type of ternary and hybrid cement, and the mechanical resistance of the analysed mortars decreases. The results obtained show the favorable behavior of the ternary and hybrid cements made with this CDW. Despite the variations observed in the different types of cement, they all comply with the current standards applicable to commercial cements and open up a new opportunity to improve sustainability in the construction sector.
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Affiliation(s)
- Moisés Frías
- Eduardo Torroja Institute for Construction Sciences (IETcc), Spanish National Research Council (CSIC), 28033 Madrid, Spain
| | - Manuel Monasterio
- Eduardo Torroja Institute for Construction Sciences (IETcc), Spanish National Research Council (CSIC), 28033 Madrid, Spain
| | - Jaime Moreno-Juez
- TECNALIA, Basque Research and Technology Alliance (BRTA), Astondo Bidea, Edificio 700, Parque Tecnológico de Bizkaia, 48160 Derio, Spain
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8
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Mighri R, Demirci UB, Alauzun JG. Microporous Borocarbonitrides B xC yN z: Synthesis, Characterization, and Promises for CO 2 Capture. Nanomaterials (Basel) 2023; 13:734. [PMID: 36839102 PMCID: PMC9960740 DOI: 10.3390/nano13040734] [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] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Revised: 02/06/2023] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
Porous borocarbonitrides (denoted BCN) were prepared through pyrolysis of the polymer stemmed from dehydrocoupled ethane 1,2-diamineborane (BH3NH2CH2CH2NH2BH3, EDAB) in the presence of F-127. These materials contain interconnected pores in the nanometer range with a high specific surface area up to 511 m2 · g-1. Gas adsorption of CO2 demonstrated an interesting uptake (3.23 mmol · g-1 at 0 °C), a high CO2/N2 selectivity as well as a significant recyclability after several adsorption-desorption cycles. For comparison's sake, a synthesized non-porous BCN as well as a commercial BN sample were studied to investigate the role of porosity and carbon doping factors in CO2 capture. The present work thus tends to demonstrate that the two-step synthesis of microporous BCN adsorbent materials from EDAB using a bottom-up approach (dehydrocoupling followed by pyrolysis at 1100 °C) is relatively simple and interesting.
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Affiliation(s)
- Rimeh Mighri
- Institut Charles Gerhardt, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Umit B. Demirci
- Institut Europeen des Membranes, IEM–UMR 5635, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
| | - Johan G. Alauzun
- Institut Charles Gerhardt, Univ Montpellier, CNRS, ENSCM, 34095 Montpellier, France
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9
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Barbarin I, Politakos N, Serrano Cantador L, Cecilia JA, Sanz O, Tomosvka R. Tailoring of Textural Properties of 3D Reduced Graphene Oxide Composite Monoliths by Using Highly Crosslinked Polymer Particles toward Improved CO 2 Sorption. ACS Appl Polym Mater 2022; 4:9065-9075. [PMID: 36532886 PMCID: PMC9748741 DOI: 10.1021/acsapm.2c01421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [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: 08/14/2022] [Accepted: 10/31/2022] [Indexed: 06/17/2023]
Abstract
The main constraint on developing a full potential for CO2 adsorption of 3D composite monoliths made of reduced graphene oxide (rGO) and polymer materials is the lack of control of their textural properties, along with the diffusional limitation to the CO2 adsorption due to the pronounced polymers' microporosity. In this work, the textural properties of the composites were altered by employing highly crosslinked polymer particles, synthesized by emulsion polymerization in aqueous media. For that aim, waterborne methyl methacrylate (MMA) particles were prepared, in which the crosslinking was induced by using different quantities of divinyl benzene (DVB). Afterward, these particles were combined with rGO platelets and subjected to the reduction-induced self-assembly process. The resulting 3D monolithic porous materials certainly presented improved textural properties, in which the porosity and BET surface area were increased up to 100% with respect to noncrosslinked composites. The crosslinked density of MMA polymer particles was a key parameter controlling the porous properties of the composites. Consequently, higher CO2 uptake than that of neat GO structures and composites made of noncrosslinked MMA polymer particles was attained. This work demonstrates that a proper control of the microstructure of the polymer particles and their facile introduction within rGO self-assembly 3D structures is a powerful tool to tailor the textural properties of the composites toward improved CO2 capture performance.
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Affiliation(s)
- Iranzu Barbarin
- POLYMAT
and Department of Applied Chemistry, University
of the Basque Country UPV/EHU, 20018Donostia-San Sebastián, Spain
| | - Nikolaos Politakos
- POLYMAT
and Department of Applied Chemistry, University
of the Basque Country UPV/EHU, 20018Donostia-San Sebastián, Spain
| | - Luis Serrano Cantador
- Biopren
Group, Inorganic Chemistry and Chemical Engineering Department, Nanochemistry
University Institute (IUNAN), Universidad
de Córdoba, 14014Córdoba, Spain
| | - Juan Antonio Cecilia
- Inorganic
Chemistry, Crystallography and Mineralogy, University of Málaga, 29071Málaga, Spain
| | - Oihane Sanz
- Department
of Applied Chemistry, University of the
Basque Country, 20018Donostia-San Sebastián, Spain
| | - Radmila Tomosvka
- POLYMAT
and Department of Applied Chemistry, University
of the Basque Country UPV/EHU, 20018Donostia-San Sebastián, Spain
- Ikerbasque, Basque Foundation for Science, Maria Diaz de Haro 3, 48013Bilbao, Spain
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10
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Feng Q, Li D, Li Q, Li H, Wang Z, Zhu S, Lin Z, Cao X, Dong H. Assembling Microgels via Dynamic Cross-Linking Reaction Improves Printability, Microporosity, Tissue-Adhesion, and Self-Healing of Microgel Bioink for Extrusion Bioprinting. ACS Appl Mater Interfaces 2022; 14:15653-15666. [PMID: 35344348 DOI: 10.1021/acsami.2c01295] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Extrusion bioprinting has been widely used to fabricate complicated and heterogeneous constructs for tissue engineering and regenerative medicine. Despite the remarkable progress acquired so far, the exploration of qualified bioinks is still challenging, mainly due to the conflicting requirements on the printability/shape-fidelity and cell viability. Herein, a new strategy is proposed to formulate a dynamic cross-linked microgel assembly (DC-MA) bioink, which can achieve both high printability/shape-fidelity and high cell viability by strengthening intermicrogel interactions through dynamic covalent bonds while still maintaining the relatively low mechanical modulus of microgels. As a proof-of-concept, microgels are prepared by cross-linking hyaluronic acid modified with methacrylate and phenylboric acid groups (HAMA-PBA) and methacrylated gelatin (GelMA) via droplet-based microfluidics, followed by assembling into DC-MA bioink with a dynamic cross-linker (dopamine-modified hyaluronic acid, HA-DA). As a result, 2D and 3D constructs with high shape-fidelity can be printed without post-treatment, and the encapsulated L929 cells exhibit high cell viability after extrusion. Moreover, the addition of the dynamic cross-linker (HA-DA) also improves the microporosity, tissue-adhesion, and self-healing of the DC-MA bioink, which is very beneficial for tissue engineering and regenerative medicine applications including wound healing. We believe the present work sheds a new light on designing new bioinks for extrusion bioprinting.
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Affiliation(s)
- Qi Feng
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
| | - Dingguo Li
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
| | - Qingtao Li
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- School of Medicine, South China University of Technology, Guangzhou 510006, China
| | - Haofei Li
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, China
| | - Zetao Wang
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
| | - Shuangli Zhu
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
| | - Zefeng Lin
- Guangdong Key Lab of Orthopedic Technology and Implant Materials, General Hospital of Southern Theater Command of PLA, Guangzhou 510010, China
| | - Xiaodong Cao
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Engineering of Guangdong Province, South China University of Technology, Guangzhou 510641, China
| | - Hua Dong
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), South China University of Technology, Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P. R. China
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11
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Ouyang L, Wojciechowski JP, Tang J, Guo Y, Stevens MM. Tunable Microgel-Templated Porogel (MTP) Bioink for 3D Bioprinting Applications. Adv Healthc Mater 2022; 11:e2200027. [PMID: 35037731 PMCID: PMC7615490 DOI: 10.1002/adhm.202200027] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [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: 01/05/2022] [Indexed: 11/08/2022]
Abstract
Micropores are essential for tissue engineering to ensure adequate mass transportation for embedded cells. Despite the considerable progress made by advanced 3D bioprinting technologies, it remains challenging to engineer micropores of 100 µm or smaller in cell-laden constructs. Here, a microgel-templated porogel (MTP) bioink platform is reported to introduce controlled microporosity in 3D bioprinted hydrogels in the presence of living cells. Templated gelatin microgels are fabricated with varied sizes (≈10, ≈45, and ≈100 µm) and mixed with photo-crosslinkable formulations to make composite MTP bioinks. The addition of microgels significantly enhances the shear-thinning and self-healing viscoelastic properties and thus the printability of bioinks with cell densities up to 1 × 108 mL-1 in matrix. Consistent printability is achieved for a series of MTP bioinks based on different component ratios and matrix materials. After photo-crosslinking the matrix phase, the templated microgels dissociated and diffused under physiological conditions, resulting in corresponding micropores in situ. When embedding osteoblast-like cells in the matrix phase, the MTP bioinks support higher metabolic activity and more uniform mineral formation than bulk gel controls. The approach provides a facile strategy to engineer precise micropores in 3D printed structures to compensate for the limited resolution of current bioprinting approaches.
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Affiliation(s)
- Liliang Ouyang
- Department of Materials Department of Bioengineering Institute of Biomedical Engineering Imperial College London London SW7 2AZ, UK; Department of Mechanical Engineering Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing “Biomanufacturing and Engineering Living Systems” Innovation International Talents Base (111 Base) Tsinghua University Beijing 100084, China
| | - Jonathan P. Wojciechowski
- Department of Materials Department of Bioengineering Institute of Biomedical Engineering Imperial College London London SW7 2AZ, UK
| | - Jiaqing Tang
- Department of Materials Department of Bioengineering Institute of Biomedical Engineering Imperial College London London SW7 2AZ, UK
| | - Yuzhi Guo
- Department of Mechanical Engineering Biomanufacturing and Rapid Forming Technology Key Laboratory of Beijing “Biomanufacturing and Engineering Living Systems” Innovation International Talents Base (111 Base) Tsinghua University Beijing 100084, China
| | - Molly M. Stevens
- Department of Materials Department of Bioengineering Institute of Biomedical Engineering Imperial College London London SW7 2AZ, UK
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12
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Almasri R, Schultz HB, Møller A, Bremmell KE, Garcia-Bennett A, Joyce P, Prestidge CA. Role of Silica Intrawall Microporosity on Abiraterone Acetate Solubilization and In Vivo Oral Absorption. Mol Pharm 2022; 19:1091-1103. [PMID: 35238208 DOI: 10.1021/acs.molpharmaceut.1c00781] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
SBA-15 mesoporous silica (MPS) has been widely used in oral drug delivery; however, it has not been utilized for solidifying lipid-based formulations, and the impact of their characteristic intrawall microporosity remains largely unexplored. Here, we derive the impact of the MPS microporosity on the in vitro solubilization and in vivo oral pharmacokinetics of the prostate cancer drug abiraterone acetate (AbA) when coencapsulated along with medium chain lipids into the pores. AbA in lipid (at 80% equilibrium solubility) was imbibed within a range of MPS particles (with comparable morphology and mesoporous structure but contrasting microporosity ranging from 0-247 m2/g), and their solid-state properties were characterized. Drug solubilization studies during in vitro lipolysis revealed that microporosity was the key factor in facilitating AbA solubilization by increasing the surface area available for drug-lipid diffusion. Interestingly, microporosity hindered hydrolysis of AbA to its active metabolite, abiraterone (Ab), under simulated intestinal conditions. This unique relationship between microporosity and AbA/Ab aqueous solubilization behavior was hypothesized to have significant implications on the subsequent bioavailability of the active metabolite. In vivo oral pharmacokinetics studies in male Sprague-Dawley rats revealed that MPS with moderate microporosity attained the highest relative bioavailability, while poor in vitro-in vivo correlations (IVIVC) existed between in vitro drug solubilization during lipolysis and in vivo AUC. Despite this, a reasonable IVIVC was established between the in vitro solubilization and in vivo Cmax, providing evidence for an association between silica microporosity and oral drug absorption.
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Affiliation(s)
- Ruba Almasri
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Hayley B Schultz
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Amalie Møller
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia.,Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Kristen E Bremmell
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia
| | | | - Paul Joyce
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Clive A Prestidge
- UniSA Clinical & Health Science, University of South Australia, Adelaide, South Australia 5000, Australia
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13
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Ghayor C, Bhattacharya I, Guerrero J, Özcan M, Weber FE. 3D-Printed HA-Based Scaffolds for Bone Regeneration: Microporosity, Osteoconduction and Osteoclastic Resorption. Materials (Basel) 2022; 15:ma15041433. [PMID: 35207973 PMCID: PMC8875550 DOI: 10.3390/ma15041433] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 02/04/2022] [Accepted: 02/09/2022] [Indexed: 02/04/2023]
Abstract
Additive manufacturing enables the realization of the macro- and microarchitecture of bone substitutes. The macroarchitecture is determined by the bone defect and its shape makes the implant patient specific. The preset distribution of the 3D-printed material in the macroarchitecture defines the microarchitecture. At the lower scale, the nanoarchitecture of 3D-printed scaffolds is dependent on the post-processing methodology such as the sintering temperature. However, the role of microarchitecture and nanoarchitecture of scaffolds for osteoconduction is still elusive. To address these aspects in more detail, we produced lithography-based osteoconductive scaffolds from hydroxyapatite (HA) of identical macro- and microarchitecture and varied their nanoarchitecture, such as microporosity, by increasing the maximum sintering temperatures from 1100 to 1400 °C. The different scaffold types were characterized for microporosity, compression strength, and nanoarchitecture. The in vivo results, based on a rabbit calvarial defect model showed that bony ingrowth, as a measure of osteoconduction, was independent from scaffold’s microporosity. The same applies to in vitro osteoclastic resorbability, since on all tested scaffold types, osteoclasts formed on their surfaces and resorption pits upon exposure to mature osteoclasts were visible. Thus, for wide-open porous HA-based scaffolds, a low degree of microporosity and high mechanical strength yield optimal osteoconduction and creeping substitution. Based on our study, non-unions, the major complication during demanding bone regeneration procedures, could be prevented.
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Affiliation(s)
- Chafik Ghayor
- Center of Dental Medicine, Oral Biotechnology & Bioengineering, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland; (C.G.); (I.B.); (J.G.)
| | - Indranil Bhattacharya
- Center of Dental Medicine, Oral Biotechnology & Bioengineering, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland; (C.G.); (I.B.); (J.G.)
| | - Julien Guerrero
- Center of Dental Medicine, Oral Biotechnology & Bioengineering, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland; (C.G.); (I.B.); (J.G.)
| | - Mutlu Özcan
- Center of Dental Medicine, Division of Dental Biomaterials, Clinic for Reconstructive Dentistry, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland;
| | - Franz E. Weber
- Center of Dental Medicine, Oral Biotechnology & Bioengineering, University of Zurich, Plattenstrasse 11, 8032 Zurich, Switzerland; (C.G.); (I.B.); (J.G.)
- CABMM, Center for Applied Biotechnology and Molecular Medicine, University of Zurich, Winterthurerstr. 190, 8057 Zurich, Switzerland
- Correspondence: ; Tel.: +41-44-634-3140
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14
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Miller KA, Alemany LB, Roy S, Yan Q, Demingos PG, Singh CV, Alahakoon S, Egap E, Thomas EL, Ajayan PM. High-Strength, Microporous, Two-Dimensional Polymer Thin Films with Rigid Benzoxazole Linkage. ACS Appl Mater Interfaces 2022; 14:1861-1873. [PMID: 34978172 DOI: 10.1021/acsami.1c17501] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Two-dimensional (2D) rigid polymers provide an opportunity to translate the high-strength, high-modulus mechanical performance of classic rigid-rod 1D polymers across a plane by extending covalent bonding into two dimensions while simultaneously reducing density due to microporosity by structural design. Thus far, this potential has remained elusive because of the challenge of producing high-quality 2D polymer thin films, particularly those with irreversible, rigid benzazole linkages. Here, we present a facile two-step process that allows the deposition of a uniform intermediate film network via reversible, non-covalent interactions, followed by a subsequent solid-state annealing step that facilitates the irreversible conversion to a 2D covalently bonded polymer product with benzoxazole linkages. We demonstrate the versatility of this synthesis method by producing films with four different aromatic core units. The resulting films show microporosity and anisotropy with a 2D layered structure that can be exfoliated into few-layer nanosheets using a freeze-thaw method. These films have promising mechanical properties with an in-plane ultimate tensile strength of nearly 40 MPa and axial tensile and transverse compressive elastic moduli on the scale of several GPa, rivaling the performance of solution-cast films of 1D polybenzoxazole, as well as several other 1D high-strength polymer films.
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Affiliation(s)
- Kristen A Miller
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Lawrence B Alemany
- Department of Chemistry and Shared Equipment Authority, Rice University, Houston, Texas 77005, United States
| | - Soumyabrata Roy
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Qianqian Yan
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Pedro Guerra Demingos
- Department wof Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada
| | - Chandra Veer Singh
- Department wof Materials Science and Engineering, University of Toronto, Toronto, ON M5S 3E4, Canada
| | - Sampath Alahakoon
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Eilaf Egap
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
| | - Edwin L Thomas
- Department of Materials Science and Engineering, Texas A&M University, College Station, Texas 77843, United States
| | - Pulickel M Ajayan
- Department of Materials Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
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15
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Liu Y, Cai L, Ma L, Li M, Yang J, Chen K, Yin P. Modulating Polymer Dynamics via Supramolecular Interaction with Ultrasmall Nanocages for Recyclable Gas Separation Membranes with Intrinsic Microporosity. Nano Lett 2021; 21:9021-9029. [PMID: 34714086 DOI: 10.1021/acs.nanolett.1c02379] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The engineering of mixed-matrix membranes is severely hindered by the trade-off between mechanical performance and effective utilization of inorganic fillers' microporosity. Herein, we report a feasible approach for optimal gas separation membranes through the fabrication of coordination nanocages with poly(4-vinylpyridine) (P4VP) via strong supramolecular interactions, enabling the homogeneous dispersion of nanocages in polymer matrixes with long-term structural stability. Meanwhile, suggested from dynamics studies, the strong attraction between P4VP and nanocages slows down polymer dynamics and rigidifies the polymer chains, leading to frustrated packing and lowered densities of the polymer matrix. This effect allows the micropores of nanocages to be accessible to external gas molecules, contributing to the intrinsic microporosity of the nanocomposites and the simultaneous enhancement of permselectivities. The facile strategy for supramolecular synthesis and polymer dynamics attenuation paves avenues to rational design of functional hybrid membranes for gas separation applications.
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Affiliation(s)
- Yuan Liu
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Linkun Cai
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Litao Ma
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Mu Li
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Junsheng Yang
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Kun Chen
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
| | - Panchao Yin
- State Key Laboratory of Luminescent Materials and Devices & South China Advanced Institute for Soft Matter Science and Technology, South China University of Technology, Guangzhou 510640, P. R. China
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16
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Sathish CI, Premkumar S, Chu X, Yu X, Breese MBH, Al-Abri M, Al-Muhtaseb AH, Karakoti A, Yi J, Vinu A. Microporous Carbon Nitride (C 3 N 5.4 ) with Tetrazine based Molecular Structure for Efficient Adsorption of CO 2 and Water. Angew Chem Int Ed Engl 2021; 60:21242-21249. [PMID: 34378296 DOI: 10.1002/anie.202108605] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [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: 06/28/2021] [Revised: 07/27/2021] [Indexed: 11/11/2022]
Abstract
Mesoporous carbon nitrides with C3 N5 and C3 N6 stoichiometries created a new momentum in the field of organic metal-free semiconductors owing to their unique band structures and high basicity. Here, we report on the preparation of a novel graphitic microporous carbon nitride with a tetrazine based chemical structure and the composition of C3 N5.4 using ultra-stable Y zeolite as the template and aminoguanidine hydrochloride, a high nitrogen-containing molecule, as the CN precursor. Spectroscopic characterization and density functional theory calculations reveal that the prepared material exhibits a new molecular structure, which comprises two tetrazines and one triazine rings in the unit cell and is thermodynamically stable. The resultant carbon nitride shows an outstanding surface area of 130.4 m2 g-1 and demonstrates excellent CO2 adsorption per unit surface area of 47.54 μmol m-2 , which is due to the existence of abundant free NH2 groups, basic sites and microporosity. The material also exhibits highly selective sensing over water molecules (151.1 mmol g-1 ) and aliphatic hydrocarbons due to its unique microporous structure with a high amount of hydrophilic nitrogen moieties and recognizing ability towards small molecules.
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Affiliation(s)
- C I Sathish
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - S Premkumar
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - Xueze Chu
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - Xiaojiang Yu
- Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore
| | - Mark B H Breese
- Singapore Synchrotron Light Source, National University of Singapore, Singapore, 117603, Singapore.,Department of Physics, National University of Singapore, Singapore, 119260, Singapore
| | - Mohammed Al-Abri
- Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, Muscat, Oman
| | - Ala'a H Al-Muhtaseb
- Department of Petroleum and Chemical Engineering, College of Engineering, Sultan Qaboos University, Muscat, Oman
| | - Ajay Karakoti
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - Jiabao Yi
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
| | - Ajayan Vinu
- Global Innovative Center for Advanced Nanomaterials (GICAN), College of Engineering, Science, and Environment, The University of Newcastle, Callaghan, New South Wales, 2308, Australia
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17
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Hwang SH, Kim YK, Seo HJ, Jeong SM, Kim J, Lim SK. The Enhanced Hydrogen Storage Capacity of Carbon Fibers: The Effect of Hollow Porous Structure and Surface Modification. Nanomaterials (Basel) 2021; 11:nano11071830. [PMID: 34361215 PMCID: PMC8308342 DOI: 10.3390/nano11071830] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 07/07/2021] [Accepted: 07/12/2021] [Indexed: 11/16/2022]
Abstract
In this study, highly porous carbon fiber was prepared for hydrogen storage. Porous carbon fiber (PCF) and activated porous carbon fiber (APCF) were derived by carbonization and chemical activation after selectively removing polyvinyl alcohol from a bi-component fiber composed of polyvinyl alcohol and polyacrylonitrile (PAN). The chemical activation created more pores on the surface of the PCF, and consequently, highly porous APCF was obtained with an improved BET surface area (3058 m2 g−1) and micropore volume (1.18 cm3 g−1) compare to those of the carbon fiber, which was prepared by calcination of monocomponent PAN. APCF was revealed to be very efficient for hydrogen storage, its hydrogen capacity of 5.14 wt% at 77 K and 10 MPa. Such hydrogen storage capacity is much higher than that of activated carbon fibers reported previously. To further enhance hydrogen storage capacity, catalytic Pd nanoparticles were deposited on the surface of the APCF. The Pd-deposited APCF exhibits a high hydrogen storage capacity of 5.45 wt% at 77 K and 10 MPa. The results demonstrate the potential of Pd-deposited APCF for efficient hydrogen storage.
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Affiliation(s)
- Sung-Ho Hwang
- Division of Energy Technology, DGIST, Daegu 42988, Korea; (S.-H.H.); (Y.K.K.); (H.-J.S.); (S.M.J.)
| | - Young Kwang Kim
- Division of Energy Technology, DGIST, Daegu 42988, Korea; (S.-H.H.); (Y.K.K.); (H.-J.S.); (S.M.J.)
| | - Hye-Jin Seo
- Division of Energy Technology, DGIST, Daegu 42988, Korea; (S.-H.H.); (Y.K.K.); (H.-J.S.); (S.M.J.)
| | - Soon Moon Jeong
- Division of Energy Technology, DGIST, Daegu 42988, Korea; (S.-H.H.); (Y.K.K.); (H.-J.S.); (S.M.J.)
| | - Jongwon Kim
- Department of Fiber System Engineering, Yeungnam University, Gyeongsan 38541, Korea
- Correspondence: (J.K.); (S.K.L.)
| | - Sang Kyoo Lim
- Division of Energy Technology, DGIST, Daegu 42988, Korea; (S.-H.H.); (Y.K.K.); (H.-J.S.); (S.M.J.)
- Department of Interdisciplinary Engineering, DGIST, Daegu 42988, Korea
- Correspondence: (J.K.); (S.K.L.)
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18
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Huang F, Hsieh YF, Qiu X, Patel S, Li S. Engineering the Composition of Microfibers to Enhance the Remodeling of a Cell-Free Vascular Graft. Nanomaterials (Basel) 2021; 11:1613. [PMID: 34202961 DOI: 10.3390/nano11061613] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 02/06/2023]
Abstract
The remodeling of vascular grafts is critical for blood vessel regeneration. However, most scaffold materials have limited cell infiltration. In this study, we designed and fabricated a scaffold that incorporates a fast-degrading polymer polydioxanone (PDO) into the microfibrous structure by means of electrospinning technology. Blending PDO with base polymer decreases the density of electrospun microfibers yet did not compromise the mechanical and structural properties of the scaffold, and effectively enhanced cell infiltration. We then used this technique to fabricate a tubular scaffold with heparin conjugated to the surface to suppress thrombosis, and the construct was implanted into the carotid artery as a vascular graft in animal studies. This graft significantly promoted cell infiltration, and the biochemical cues such as immobilized stromal cell-derived factor-1α further enhanced cell recruitment and the long-term patency of the grafts. This work provides an approach to optimize the microfeatures of vascular grafts, and will have broad applications in scaffold design and fabrication for regenerative engineering.
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19
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Kiciński W, Dyjak S, Gratzke M. Pyrolysis of Porous Organic Polymers under a Chlorine Atmosphere to Produce Heteroatom-Doped Microporous Carbons. Molecules 2021; 26:3656. [PMID: 34203962 PMCID: PMC8232777 DOI: 10.3390/molecules26123656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 06/09/2021] [Accepted: 06/13/2021] [Indexed: 11/20/2022] Open
Abstract
Three types of cross-linked porous organic polymers (either oxygen-, nitrogen-, or sulfur-doped) were carbonized under a chlorine atmosphere to obtain chars in the form of microporous heteroatom-doped carbons. The studied organic polymers constitute thermosetting resins obtained via sol-gel polycondensation of resorcinol and five-membered heterocyclic aldehydes (either furan, pyrrole, or thiophene). Carbonization under highly oxidative chlorine (concentrated and diluted Cl2 atmosphere) was compared with pyrolysis under an inert helium atmosphere. All pyrolyzed samples were additionally annealed under NH3. The influence of pyrolysis and additional annealing conditions on the carbon materials' porosity and chemical composition was elucidated.
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Affiliation(s)
- Wojciech Kiciński
- Institute of Chemistry, Military University of Technology, 2 Kaliskiego Street, PL 00-908 Warsaw, Poland; (S.D.); (M.G.)
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20
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Jie K, Zhou Y, Ryan HP, Dai S, Nitschke JR. Engineering Permanent Porosity into Liquids. Adv Mater 2021; 33:e2005745. [PMID: 33768680 DOI: 10.1002/adma.202005745] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/14/2020] [Indexed: 06/12/2023]
Abstract
The possibility of engineering well-defined pores into liquid materials is fascinating from both a conceptual and an applications point of view. Although the concept of porous liquids was proposed in 2007, these materials had remained hypothetical due to the technical challenges associated with their synthesis. Over the past five years, however, reports of the successful construction of porous liquids based on existing porous scaffolds, such as coordination cages, organic cages, metal-organic frameworks, porous carbons, zeolites, and porous polymers, have started to emerge. Here, the focus is on these early reports of porous liquids as prototypes in the field, classified according to the previously defined types of porous liquids. Particular attention will be paid to design strategies and structure-property relationships. Porous liquids have already exhibited promising applications in gas storage, transportation, and chemical separations. Thus, they show great potential for use in the chemical industry. The challenges of preparation, scale-up, volatility, thermal and chemical stability, and competition with porous solids will also be discussed.
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Affiliation(s)
- Kecheng Jie
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Yujuan Zhou
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
- Department of Chemistry, Zhejiang University, Hangzhou, 310027, P. R. China
| | - Hugh P Ryan
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Sheng Dai
- Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6201, USA
- Department of Chemistry, University of Tennessee, Knoxville, TN, 37996-1600, USA
| | - Jonathan R Nitschke
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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21
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Musse M, Bidault K, Quellec S, Brunel B, Collewet G, Cambert M, Bertin N. Spatial and temporal evolution of quantitative magnetic resonance imaging parameters of peach and apple fruit - relationship with biophysical and metabolic traits. Plant J 2021; 105:62-78. [PMID: 33095963 DOI: 10.1111/tpj.15039] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 10/06/2020] [Accepted: 10/12/2020] [Indexed: 05/24/2023]
Abstract
Fruits are complex organs that are spatially regulated during development. Limited phenotyping capacity at cell and tissue levels is one of the main obstacles to our understanding of the coordinated regulation of the processes involved in fruit growth and quality. In this study, the spatial evolution of biophysical and metabolic traits of peach and apple fruit was investigated during fruit development. In parallel, the multi-exponential relaxation times and apparent microporosity were assessed by quantitative magnetic resonance imaging (MRI). The aim was to identify the possible relationships between MRI parameters and variations in the structure and composition of fruit tissues during development so that transverse relaxation could be proposed as a biomarker for the assessment of the structural and functional evolution of fruit tissues during growth. The study provides species-specific data on developmental and spatial variations in density, cell number and size distribution, insoluble and soluble compound accumulation and osmotic and water potential in the fruit mesocarp. Magnetic resonance imaging was able to capture tissue evolution and the development of pericarp heterogeneity by accessing information on cell expansion, water status and distribution at cell level, and microporosity. Changes in vacuole-related transverse relaxation rates were mostly explained by cell/vacuole size. The impact of cell solute composition, microporosity and membrane permeability on relaxation times is also discussed. The results demonstrate the usefulness of MRI as a tool to phenotype fruits and to access important physiological data during development, including information on spatial variability.
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Affiliation(s)
- Maja Musse
- INRAE UR OPAALE, 17, Rue de Cucillé, Rennes, 35044, France
| | - Kévin Bidault
- INRAE UR OPAALE, 17, Rue de Cucillé, Rennes, 35044, France
- INRAE UR1115 Plantes et Systèmes de Culture Horticoles - Site Agroparc, Avignon, 84914, France
| | | | - Béatrice Brunel
- INRAE UR1115 Plantes et Systèmes de Culture Horticoles - Site Agroparc, Avignon, 84914, France
| | | | | | - Nadia Bertin
- INRAE UR1115 Plantes et Systèmes de Culture Horticoles - Site Agroparc, Avignon, 84914, France
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22
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Ghayor C, Chen TH, Bhattacharya I, Özcan M, Weber FE. Microporosities in 3D-Printed Tricalcium-Phosphate-Based Bone Substitutes Enhance Osteoconduction and Affect Osteoclastic Resorption. Int J Mol Sci 2020; 21:E9270. [PMID: 33291724 DOI: 10.3390/ijms21239270] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/01/2020] [Accepted: 12/03/2020] [Indexed: 01/01/2023] Open
Abstract
Additive manufacturing is a key technology required to realize the production of a personalized bone substitute that exactly meets a patient’s need and fills a patient-specific bone defect. Additive manufacturing can optimize the inner architecture of the scaffold for osteoconduction, allowing fast and reliable defect bridging by promoting rapid growth of new bone tissue into the scaffold. The role of scaffold microporosity/nanoarchitecture in osteoconduction remains elusive. To elucidate this relationship, we produced lithography-based osteoconductive scaffolds from tricalcium phosphate (TCP) with identical macro- and microarchitecture, but varied their nanoarchitecture/microporosity by ranging maximum sintering temperatures from 1000 °C to 1200 °C. After characterization of the different scaffolds’ microporosity, compression strength, and nanoarchitecture, we performed in vivo studies that showed that ingrowth of bone as an indicator of osteoconduction significantly decreased with decreasing microporosity. Moreover, at the 1200 °C peak sinter temperature and lowest microporosity, osteoclastic degradation of the material was inhibited. Thus, even for wide-open porous TCP-based scaffolds, a high degree of microporosity appears to be essential for optimal osteoconduction and creeping substitution, which can prevent non-unions, the major complication during bone regeneration procedures.
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Zuo P, Zhou J, Yang Z, Xu T. Hydrophilic Microporous Polymer Membranes: Synthesis and Applications. Chempluschem 2020; 85:1893-1904. [PMID: 32845086 DOI: 10.1002/cplu.202000486] [Citation(s) in RCA: 8] [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: 06/22/2020] [Revised: 07/31/2020] [Indexed: 11/05/2022]
Abstract
Ion and water transfer in subnanometer-sized confined channels of hydrophilic microporous polymer membranes show enormous potential in tackling the ubiquitous trade-off between permeability and selectivity for energy and environment-related membrane technologies. To this end, a variety of hydrophilic polymers of intrinsic microporosity (HPIMs) have been developed. Herein, the synthetic strategies toward HPIMs are summarized, including post-synthetic modification of polymers to introduce polar groups (e. g., amines, hydroxy groups, carboxylic acids, tetrazoles) or charged moieties (e. g., quaternary ammonium salts, sulfonic acids), and the polymerization of hydrophilic monomers. The advantages of HPIM membranes over others when employed in energy conversion and storage, acid gas capture and separation, ionic diodes, and ultrafiltration, are highlighted.
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Affiliation(s)
- Peipei Zuo
- CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Jiahui Zhou
- CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Zhengjin Yang
- CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, P.R. China
| | - Tongwen Xu
- CAS Key Laboratory of Soft Matter Chemistry, Collaborative Innovation Center of Chemistry for Energy Materials, School of Chemistry and Material Science, University of Science and Technology of China, Hefei, 230026, P.R. China
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Badaczewski FM, Loeh MO, Pfaff T, Wallacher D, Clemens D, Smarsly BM. Correction: An advanced structural characterization of templated meso-macroporous carbon monoliths by small- and wide-angle scattering techniques. Beilstein J Nanotechnol 2020; 11:678-679. [PMID: 32395397 PMCID: PMC7188985 DOI: 10.3762/bjnano.11.54] [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] [Figures] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
[This corrects the article DOI: 10.3762/bjnano.11.23.].
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Affiliation(s)
- Felix M Badaczewski
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Rung 17, 35492 Giessen, Germany
| | - Marc O Loeh
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Rung 17, 35492 Giessen, Germany
- Schunk Carbon Technology GmbH, Rodheimer Straße 59, 35452 Heuchelheim, Germany
| | - Torben Pfaff
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Rung 17, 35492 Giessen, Germany
| | - Dirk Wallacher
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Daniel Clemens
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Bernd M Smarsly
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Rung 17, 35492 Giessen, Germany
- Center for Materials Research (LaMa), Justus-Liebig-University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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25
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Badaczewski FM, Loeh MO, Pfaff T, Wallacher D, Clemens D, Smarsly BM. An advanced structural characterization of templated meso-macroporous carbon monoliths by small- and wide-angle scattering techniques. Beilstein J Nanotechnol 2020; 11:310-322. [PMID: 32117669 PMCID: PMC7034224 DOI: 10.3762/bjnano.11.23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 01/24/2020] [Indexed: 06/10/2023]
Abstract
This study is dedicated to link the nanoscale pore space of carbon materials, prepared by hard-templating of meso-macroporous SiO2 monoliths, to the corresponding nanoscale polyaromatic microstructure using two different carbon precursors wthat generally exhibit markedly different carbonization properties, i.e., a graphitizable pitch and a non-graphitizable resin. The micro- and mesoporosity of these monolithic carbon materials was studied by the sorption behavior of a relatively large organic molecule (p-xylene) in comparison to typical gas adsorbates (Ar). In addition, to obtain a detailed view on the nanopore space small-angle neutron scattering (SANS) combined with in situ physisorption was applied, using deuterated p-xylene (DPX) as a contrast-matching agent in the neutron scattering process. The impact of the carbon precursor on the structural order on an atomic scale in terms of size and disorder of the carbon microstructure, on the nanopore structure, and on the template process is analyzed by special evaluation approaches for SANS and wide-angle X-ray scattering (WAXS). The WAXS analysis shows that the pitch-based monolithic material exhibits a more ordered microstructure consisting of larger graphene stacks and similar graphene layer sizes compared to the monolithic resin. Another major finding is the discrepancy in the accessible micro/mesoporosity between Ar and deuterated p-xylene that found for the two different carbon precursors, pitch and resin, which can be regarded as representative carbon precursors in general. These differences essentially indicate that physisorption using probe gases such as Ar or N2 can provide misleading parameters if to be used to appraise the accessibility of the nanoscale pore space.
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Affiliation(s)
- Felix M Badaczewski
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35492 Giessen, Germany
| | - Marc O Loeh
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35492 Giessen, Germany
- Schunk Carbon Technology GmbH, Rodheimer Straße 59, 35452 Heuchelheim, Germany
| | - Torben Pfaff
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35492 Giessen, Germany
| | - Dirk Wallacher
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Daniel Clemens
- Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Bernd M Smarsly
- Institute of Physical Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35492 Giessen, Germany
- Center for Materials Research (LaMa), Justus-Liebig-University, Heinrich-Buff-Ring 16, 35392 Giessen, Germany
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26
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Vallejos Baier R, Benjumeda Wijnhoven I, Irribarra del Valle V, Millán Giovanetti C, Vivanco JF. Microporosity Clustering Assessment in Calcium Phosphate Bioceramic Particles. Front Bioeng Biotechnol 2019; 7:281. [PMID: 31709245 PMCID: PMC6822304 DOI: 10.3389/fbioe.2019.00281] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 10/04/2019] [Indexed: 01/09/2023] Open
Abstract
There has been an increase in the application of different biomaterials to repair hard tissues. Within these biomaterials, calcium phosphate (CaP) bioceramics are suitable candidates, since they can be biocompatible, biodegradable, osteoinductive, and osteoconductive. Moreover, during sintering, bioceramic materials are prone to form micropores and undergo changes in their surface topographical features, which influence cellular physiology and bone ingrowth. In this study, five geometrical properties from the surface of CaP bioceramic particles and their micropores were analyzed by data mining techniques, driven by the research question: what are the geometrical properties of individual micropores in a CaP bioceramic, and how do they relate to each other? The analysis not only shows that it is feasible to determine the existence of micropore clusters, but also to quantify their geometrical properties. As a result, these CaP bioceramic particles present three groups of micropore clusters distinctive by their geometrical properties. Consequently, this new methodological clustering assessment can be applied to advance the knowledge about CaP bioceramics and their role in bone tissue engineering.
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Affiliation(s)
- Raúl Vallejos Baier
- Faculty of Engineering and Sciences, Adolfo Ibáñez University, Viña del Mar, Chile
| | | | | | | | - Juan F. Vivanco
- Faculty of Engineering and Sciences, Adolfo Ibáñez University, Viña del Mar, Chile
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Palma-Cando A, Rendón-Enríquez I, Tausch M, Scherf U. Thin Functional Polymer Films by Electropolymerization. Nanomaterials (Basel) 2019; 9:nano9081125. [PMID: 31382661 PMCID: PMC6723103 DOI: 10.3390/nano9081125] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 08/01/2019] [Accepted: 08/02/2019] [Indexed: 02/05/2023]
Abstract
Intrinsically conducting polymers (ICPs) have been widely utilized in organic electronics, actuators, electrochromic devices, and sensors. Many potential applications demand the formation of thin polymer films, which can be generated by electrochemical polymerization. Electrochemical methods are quite powerful and versatile and can be utilized for investigation of ICPs, both for educational purposes and materials chemistry research. In this study, we show that potentiodynamic and potentiostatic techniques can be utilized for generating and characterizing thin polymer films under the context of educational chemistry research and state-of-the-art polymer research. First, two well-known bifunctional monomers (with only two linking sites)-aniline and bithiophene-and their respective ICPs-polyaniline (PANI) and polybithiophene (PBTh)-were electrochemically generated and characterized. Tests with simple electrochromic devices based on PANI and PBTh were carried out at different doping levels, where changes in the UV-VIS absorption spectra and color were ascribed to changes in the polymer structures. These experiments may attract students' interest in the electrochemical polymerization of ICPs as doping/dedoping processes can be easily understood from observable color changes to the naked eye, as shown for the two polymers. Second, two new carbazole-based multifunctional monomers (with three or more linking sites)-tris(4-(carbazol-9-yl)phenyl)silanol (TPTCzSiOH) and tris(3,5-di(carbazol-9-yl)phenyl)silanol (TPHxCzSiOH)-were synthesized to produce thin films of cross-linked polymer networks by electropolymerization. These thin polymer films were characterized by electrochemical quartz crystal microbalance (EQCM) experiments and nitrogen sorption, and the results showed a microporous nature with high specific surface areas up to 930 m2g-1. PTPHxCzSiOH-modified glassy carbon electrodes showed an enhanced electrochemical response to nitrobenzene as prototypical nitroaromatic compound compared to unmodified glassy carbon electrodes.
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Affiliation(s)
- Alex Palma-Cando
- School of Chemical Sciences and Engineering, Universidad Yachay Tech, EC100115 Urcuqui, Ecuador.
- Macromolecular Chemistry Group, Bergische Universität Wuppertal, Gaußstraße 20, D-42119 Wuppertal, Germany.
| | - Ibeth Rendón-Enríquez
- Department of Chemistry and Chemical Education, Bergische Universität Wuppertal, Gaußstraße 20, D-42119 Wuppertal, Germany
| | - Michael Tausch
- Department of Chemistry and Chemical Education, Bergische Universität Wuppertal, Gaußstraße 20, D-42119 Wuppertal, Germany.
| | - Ullrich Scherf
- Macromolecular Chemistry Group, Bergische Universität Wuppertal, Gaußstraße 20, D-42119 Wuppertal, Germany.
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28
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Morais RG, Rey-Raap N, Figueiredo JL, Pereira MFR. Glucose-derived carbon materials with tailored properties as electrocatalysts for the oxygen reduction reaction. Beilstein J Nanotechnol 2019; 10:1089-1102. [PMID: 31165035 PMCID: PMC6541360 DOI: 10.3762/bjnano.10.109] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Accepted: 04/16/2019] [Indexed: 05/26/2023]
Abstract
Nitrogen-doped biomass-derived carbon materials were prepared by hydrothermal carbonization of glucose, and their textural and chemical properties were subsequently tailored to achieve materials with enhanced electrochemical performance towards the oxygen reduction reaction. Carbonization and physical activation were applied to modify the textural properties, while nitrogen functionalities were incorporated via different N-doping methodologies (ball milling and conventional methods) using melamine. A direct relationship between the microporosity of the activated carbons and the limiting current density was found, with the increase of microporosity leading to interesting improvements of the limiting current density. Regardless of the doping method used, similar amounts of nitrogen were incorporated into the carbon structures. However, significant differences were observed in the nitrogen functionalities according to the doping method applied: ball milling appeared to originate preferentially quaternary and oxidized nitrogen groups, while the formation of pyridinic and pyrrolic groups was favoured by conventional doping. The onset potential was improved and the two-electron mechanism of the original activated sample was shifted closer to a four-electron pathway due to the presence of nitrogen. Interestingly, the high pyridinic content related to a high ratio of pyridinic/quaternary nitrogen results in an increase of the onset potential, while a decrease in the quaternary/pyrrolic nitrogen ratio favors an increase in the number of electrons. Accordingly, the electrocatalyst with the highest performance was obtained from the activated sample doped with nitrogen by the conventional method, which combined the most appropriate textural and chemical properties: high microporosity and adequate proportion of the nitrogen functionalities.
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Affiliation(s)
- Rafael Gomes Morais
- Associate Laboratory LSRE-LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Natalia Rey-Raap
- Associate Laboratory LSRE-LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - José Luís Figueiredo
- Associate Laboratory LSRE-LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
| | - Manuel Fernando Ribeiro Pereira
- Associate Laboratory LSRE-LCM, Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, R. Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
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29
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Pan Y, Zhai X, Yin J, Zhang T, Ma L, Zhou Y, Zhang Y, Meng J. Hierarchical Porous and Zinc-Ion-Crosslinked PIM-1 Nanocomposite as a CO 2 Cycloaddition Catalyst with High Efficiency. ChemSusChem 2019; 12:2231-2239. [PMID: 30851144 DOI: 10.1002/cssc.201803066] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 02/24/2019] [Indexed: 06/09/2023]
Abstract
CO2 cycloaddition to epoxides is an effective and economical utilization method to alleviate the current excessive CO2 emission situation. The development of catalysts with both high catalytic efficiency and high recyclability is necessary but challenging. In this context, a heterogeneous catalyst was synthesized based on a zinc-ion-crosslinked polymer with intrinsic microporosity (PIM-1). The high microporosity of PIM-1 promoted a high Zn2+ loading rate. Additionally, the relatively stable ionic bond formed between Zn2+ and the PIM-1 framework through electrostatic interaction ensured high loading stability. In the process of CO2 cycloaddition with propylene epoxide, an optimized conversion of 90 % with a turnover frequency as high as 9533 h-1 could be achieved within 0.5 h at 100 °C and 2 MPa. After 15 cycles, the catalytic efficiency did not demonstrate a significant decline, and the catalyst was able to recover most of its activity after Zn2+ reloading. This work thereby provides a strategically designed CO2 conversion catalyst based on an ionic crosslinked polymer with intrinsic microporosity.
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Affiliation(s)
- Ying Pan
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Xiaofei Zhai
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Jian Yin
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Tianqi Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Liujia Ma
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Yi Zhou
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Yufeng Zhang
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
| | - Jianqiang Meng
- State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No.399, Binshuixi Road, Xiqing District, Tianjin, 300387, P. R. China
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30
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Lopez-Iglesias B, Suárez-García F, Aguilar-Lugo C, González Ortega A, Bartolomé C, Martínez-Ilarduya JM, de la Campa JG, Lozano ÁE, Álvarez C. Microporous Polymer Networks for Carbon Capture Applications. ACS Appl Mater Interfaces 2018; 10:26195-26205. [PMID: 30001102 DOI: 10.1021/acsami.8b05854] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A new generation of porous polymer networks has been obtained in quantitative yield by reacting two rigid trifunctional aromatic monomers (1,3,5-triphenylbenzene and triptycene) with two ketones having electron-withdrawing groups (trifluoroacetophenone and isatin) in superacidic media. The resulting amorphous networks are microporous materials, with moderate Brunauer-Emmett-Teller surface areas (from 580 to 790 m2 g-1), and have high thermal stability. In particular, isatin yields networks with a very high narrow microporosity contribution, 82% for triptycene and 64% for 1,3,5-triphenylbenzene. The existence of favorable interactions between lactams and CO2 molecules has been stated. The materials show excellent CO2 uptakes (up to 207 mg g-1 at 0 °C/1 bar) and can be regenerated by vacuum, without heating. Under postcombustion conditions, their CO2/N2 selectivities are comparable to those of other organic porous networks. Because of the easily scalable synthetic method and their favorable characteristics, these materials are very promising as industrial adsorbents.
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Affiliation(s)
| | - Fabián Suárez-García
- Instituto Nacional del Carbón, INCAR-CSIC , Dr. Ingeniero Francisco Pintado 26 , E-33011 Oviedo , Spain
| | - Carla Aguilar-Lugo
- Department of Applied Macromolecular Chemistry, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC , Juan de la Cierva 3 , E-28006 Madrid , Spain
| | - Alfonso González Ortega
- Department of Organic Chemistry , Universidad de Valladolid, Facultad de Ciencias , Paseo Belén 7 , E-47011 Valladolid , Spain
| | - Camino Bartolomé
- IU CINQUIMA, Universidad de Valladolid , Paseo Belén 5 , E-47011 Valladolid , Spain
| | | | - José G de la Campa
- Department of Applied Macromolecular Chemistry, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC , Juan de la Cierva 3 , E-28006 Madrid , Spain
| | - Ángel E Lozano
- IU CINQUIMA, Universidad de Valladolid , Paseo Belén 5 , E-47011 Valladolid , Spain
- Department of Applied Macromolecular Chemistry, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC , Juan de la Cierva 3 , E-28006 Madrid , Spain
- SMAP, UA-UVA_CSIC, Associated Research Unit to CSIC, Universidad de Valladolid, Facultad de Ciencias , Paseo Belén 7 , E-47011 Valladolid , Spain
| | - Cristina Álvarez
- Department of Applied Macromolecular Chemistry, Instituto de Ciencia y Tecnología de Polímeros, ICTP-CSIC , Juan de la Cierva 3 , E-28006 Madrid , Spain
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31
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Adamik RK, Hernández-Ibáñez N, Iniesta J, Edwards JK, Howe AGR, Armstrong RD, Taylor SH, Roldan A, Rong Y, Malpass-Evans R, Carta M, McKeown NB, He D, Marken F. Platinum Nanoparticle Inclusion into a Carbonized Polymer of Intrinsic Microporosity: Electrochemical Characteristics of a Catalyst for Electroless Hydrogen Peroxide Production. Nanomaterials (Basel) 2018; 8:E542. [PMID: 30021972 PMCID: PMC6071093 DOI: 10.3390/nano8070542] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/07/2018] [Accepted: 07/11/2018] [Indexed: 11/17/2022]
Abstract
The one-step vacuum carbonization synthesis of a platinum nano-catalyst embedded in a microporous heterocarbon (Pt@cPIM) is demonstrated. A nitrogen-rich polymer of an intrinsic microporosity (PIM) precursor is impregnated with PtCl₆2- to give (after vacuum carbonization at 700 °C) a nitrogen-containing heterocarbon with embedded Pt nanoparticles of typically 1⁻4 nm diameter (with some particles up to 20 nm diameter). The Brunauer-Emmett-Teller (BET) surface area of this hybrid material is 518 m² g-1 (with a cumulative pore volume of 1.1 cm³ g-1) consistent with the surface area of the corresponding platinum-free heterocarbon. In electrochemical experiments, the heterocarbon-embedded nano-platinum is observed as reactive towards hydrogen oxidation, but essentially non-reactive towards bigger molecules during methanol oxidation or during oxygen reduction. Therefore, oxygen reduction under electrochemical conditions is suggested to occur mainly via a 2-electron pathway on the outer carbon shell to give H₂O₂. Kinetic selectivity is confirmed in exploratory catalysis experiments in the presence of H₂ gas (which is oxidized on Pt) and O₂ gas (which is reduced on the heterocarbon surface) to result in the direct formation of H₂O₂.
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Affiliation(s)
- Robert K Adamik
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Naiara Hernández-Ibáñez
- Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain.
| | - Jesus Iniesta
- Departamento de Química Física e Instituto Universitario de Electroquímica, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain.
| | - Jennifer K Edwards
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
| | - Alexander G R Howe
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
| | - Robert D Armstrong
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
| | - Stuart H Taylor
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
| | - Alberto Roldan
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
| | - Yuanyang Rong
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Richard Malpass-Evans
- East Chem, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, Scotland EH9 3FJ, UK.
| | - Mariolino Carta
- Department of Chemistry, Swansea University, College of Science, Grove Building, Singleton Park, Swansea SA2 8PP, UK.
| | - Neil B McKeown
- East Chem, School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, Scotland EH9 3FJ, UK.
| | - Daping He
- Hubei Engineering Research Center of RF-Microwave Technology and Application, School of Science, Wuhan University of Technology, Wuhan 430070, China.
| | - Frank Marken
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
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32
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Amorós-Pérez A, Cano-Casanova L, Ouzzine M, Rufete-Beneite M, Romero-Anaya AJ, Lillo-Ródenas MÁ, Linares-Solano Á. Spherical Activated Carbons with High Mechanical Strength Directly Prepared from Selected Spherical Seeds. Materials (Basel) 2018; 11:E770. [PMID: 29748519 DOI: 10.3390/ma11050770] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2018] [Revised: 04/20/2018] [Accepted: 05/04/2018] [Indexed: 11/17/2022]
Abstract
In the present manuscript, the preparation of spherical activated carbons (SACs) with suitable adsorption properties and high mechanical strength is reported, taking advantage of the retention of the spherical shape by the raw precursors. An easy procedure (carbonization followed by CO2 activation) has been applied over a selection of three natural seeds, with a well-defined spherical shape and thermal stability: Rhamnus alaternus (RA), Osyris lanceolate (OL), and Canna indica (CI). After the carbonization-activation procedures, RA and CI, maintained their original spherical shapes and integrity, although a reduction in diameter around 48% and 25%, respectively, was observed. The porosity of the resulting SACs could be tuned as function of the activation temperature and time, leading to a spherical activated carbon with surface area up to 1600 m2/g and mechanical strength similar to those of commercial activated carbons.
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Lu J, Jiao C, Majeed Z, Jiang H. Magnesium and Nitrogen Co-Doped Mesoporous Carbon with Enhanced Microporosity for CO₂ Adsorption. Nanomaterials (Basel) 2018; 8:nano8050275. [PMID: 29693608 PMCID: PMC5977289 DOI: 10.3390/nano8050275] [Citation(s) in RCA: 12] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 04/20/2018] [Accepted: 04/23/2018] [Indexed: 02/06/2023]
Abstract
Mesoporous carbons (MC) have attracted a tremendous amount of interest due to their efficient molecular transport properties. However, the limited number of active sites and low microporosity generally impede their use for practical applications. Herein, we have fabricated Mg and N co-doped mesoporous carbon (Mg-NMC) with high microporosity via one-pot synthetic route followed by further steam activation. In comparison with the parent N-doped mesoporous carbon, Mg-NMC shows partially ordered mesostructure and improved CO₂ adsorption capacity attributed to the introduction of basic site after Mg doping. Upon further steam activation, the microporosity is enhanced to 37.3%, while the CO₂ adsorption capacity is also increased by 70.4% at 273 K and 1.0 bar.
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Affiliation(s)
- Jingting Lu
- Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, China.
- University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Chengli Jiao
- Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, China.
| | - Zeeshan Majeed
- Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, China.
| | - Heqing Jiang
- Qingdao Key Laboratory of Functional Membrane Material and Membrane Technology, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, No. 189 Songling Road, Qingdao 266101, China.
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Iwase Y, Horie Y, Honda S, Daiko Y, Iwamoto Y. Microporosity and CO₂ Capture Properties of Amorphous Silicon Oxynitride Derived from Novel Polyalkoxysilsesquiazanes. Materials (Basel) 2018; 11:E422. [PMID: 29534056 DOI: 10.3390/ma11030422] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polyalkoxysilsesquiazanes ([ROSi(NH)1.5]n, ROSZ, R = Et, nPr, iPr, nBu, sBu, nHex, sHex, cHex, decahydronaphthyl (DHNp)) were synthesized by ammonolysis at −78 °C of alkoxytrichlorosilane (ROSiCl3), which was isolated by distillation as a reaction product of SiCl4 and ROH. The simultaneous thermogravimetric and mass spectrometry analyses of the ROSZs under helium revealed a common decomposition reaction, the cleavage of the oxygen–carbon bond of the RO group to evolve alkene as a main gaseous species formed in-situ, leading to the formation of microporous amorphous Si–O–N at 550 °C to 800 °C. The microporosity in terms of the peak of the pore size distribution curve located within the micropore size range (<2 nm) and the total micropore volume, as well as the specific surface area (SSA) of the Si–O–N, increased consistently with the molecular size estimated for the alkene formed in-situ during the pyrolysis. The CO2 capture capacity at 0 °C of the Si–O–N material increased consistently with its SSA, and an excellent CO2 capture capacity of 3.9 mmol·g−1 at 0 °C and CO2 1 atm was achieved for the Si–O–N derived from DHNpOSZ having an SSA of 750 m2·g−1. The CO2 capture properties were further discussed based on their temperature dependency, and a surface functional group of the Si–O–N formed in-situ during the polymer/ceramics thermal conversion.
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Abstract
In a context of growing attention for shale gas, the precise impact of organic matter (kerogen) on hydrocarbon recovery from unconventional reservoirs still has to be assessed. Kerogen's microstructure is characterized by a very disordered pore network that greatly affects hydrocarbon transport. The specific structure and texture of this organic matter at the nanoscale is highly dependent on its origin. In this study, by the use of statistical physics and molecular dynamics, we shed some new lights on hydrocarbon transport through realistic molecular models of kerogen at different level of maturity [ Bousige et al. Nat. Mater. 2016 , 15 , 576 ]. Despite the apparent complexity, severe confinement effects controlled by the porosity of the various kerogens allow linear alkanes (from methane to dodecane) transport to be studied only via the self-diffusion coefficients of the species. The decrease of the transport coefficients with the amount of adsorbed fluid can be described by a free volume theory. Ultimately, the transport coefficients of hydrocarbons can be expressed simply as a function of the porosity (volume fraction of void) of the microstructure, thus paving the way for shale gas recovery predictions.
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Affiliation(s)
- Amaël Obliger
- MultiScale Materials Science for Energy and Environment (MSE2), The joint CNRS-MIT Laboratory, UMI CNRS 3466, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Franz-Josef Ulm
- MultiScale Materials Science for Energy and Environment (MSE2), The joint CNRS-MIT Laboratory, UMI CNRS 3466, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Roland Pellenq
- MultiScale Materials Science for Energy and Environment (MSE2), The joint CNRS-MIT Laboratory, UMI CNRS 3466, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- Department of Civil and Environmental Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
- CINaM-Aix Marseille Université-CNRS , Campus de Luminy, 13288 Marseille cedex 09, France
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Abstract
Microporosity has a critical role in improving the osteogenesis of scaffolds for bone tissue engineering. Although the exact mechanism, by which it promotes new bone formation, is not well recognized yet, the related hypothesis can be found in many previous studies. This review presents those possible mechanisms about how the microporosity enhances the osteogenic-related functions of cells in vitro and the osteogenic activity of scaffolds in vivo. In summary, the increased specific surface areas by microporosity can offer more protein adsorption sites and accelerate the release of degradation products, which facilitate the interactions between scaffolds and cells. Meanwhile, the unique surface properties of microporous scaffolds have a considerable effect on the protein adsorption. Moreover, capillary force generated by the microporosity can improve the attachment of bone-related cells on the scaffolds surface, and even make the cells achieve penetration into the micropores smaller than them. This review also pays attention to the relationship between the biological and mechanical properties of microporous scaffolds. Although lots of achievements have been obtained, there is still a lot of work to do, some of which has been proposed in the conclusions and perspectives part.
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Affiliation(s)
- Ke Zhang
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China
| | - Yubo Fan
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.,Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 102402, China
| | - Nicholas Dunne
- Centre for Medical Engineering Research, School of Mechanical and Manufacturing Engineering, Dublin City University, Stokes Building, Collins Avenue, Dublin 9, Ireland
| | - Xiaoming Li
- Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education, School of Biological Science and Medical Engineering, Beihang University, Beijing 100083, China.,Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing 102402, China.,State Key Laboratory of New Ceramic and Fine Processing, Tsinghua University, Beijing 100084, China
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Kucińska-Lipka J, Gubanska I, Skwarska A. Microporous Polyurethane Thin Layer as a Promising Scaffold for Tissue Engineering. Polymers (Basel) 2017; 9:E277. [PMID: 30970955 DOI: 10.3390/polym9070277] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/03/2017] [Accepted: 07/06/2017] [Indexed: 12/12/2022] Open
Abstract
The literature describes that the most efficient cell penetration takes place at 200–500 µm depth of the scaffold. Many different scaffold fabrication techniques were described to reach these guidelines. One such technique is solvent casting particulate leaching (SC/PL). The main advantage of this technique is its simplicity and cost efficiency, while its main disadvantage is the scaffold thickness, which is usually not less than 3000 µm. Thus, the scaffold thickness is usually far from the requirements for functional tissue reconstruction. In this paper, we report a successful fabrication of the microporous polyurethane thin layer (MPTL) of 1 mm thick, which was produced using SC/PL technique combined with phase separation (PS). The obtained MPTL was highly porous (82%), had pore size in the range of 65–426 µm and scaffold average pore size was equal to 154 ± 3 µm. Thus, it can be considered a suitable scaffold for tissue engineering purpose, according to the morphology criterion. Polyurethane (PUR) processing into MPTL scaffold caused significant decrease of contact angle from 78 ± 4° to 56 ± 6° and obtained MPTL had suitable hydrophilic characteristic for mammalian cells growth and tissue regeneration. Mechanical properties of MPTL were comparable to the properties of native tissues. As evidenced by biotechnological examination the MPTL were highly biocompatible with no observed apparent toxicity on mouse embryonic NIH 3T3 fibroblast cells. Performed studies indicated that obtained MPTL may be suitable scaffold candidate for soft TE purposes such as blood vessels.
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Huang Y, Ma E, Zhao G. Optimizing the Pore Structure of Bio-Based ACFs through a Simple KOH-Steam Reactivation. Materials (Basel) 2016; 9:E432. [PMID: 28773554 DOI: 10.3390/ma9060432] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 05/15/2016] [Accepted: 05/24/2016] [Indexed: 11/30/2022]
Abstract
Highly microporous bio-based activated carbon fibers (ACFs) were prepared through a simple reactivation method. Sawdust, as the starting material, was liquefied and melt-spun to produce the precursor fibers. Then, the precursor fibers were activated by KOH and reactivated by steam. By varying the conditions of the two activation processes, the formation mechanism of the pore structure was studied, and the result showed that steam reactivation has a positive effect on the development of microporosity. The sample with the optimal condition exhibited the highest specific surface area of 2578 m2·g−1 as well as the largest pore volume of 1.425 cm3·g−1, where micropores contributed 70.3%. Due to its excellent texture properties, the ACF exhibited a high adsorption capacity of 1934 mg/g for iodine.
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Yao Y, You Y, Zhang G, Liu J, Sun H, Zou Z, Sun S. Highly Functional Bioinspired Fe/N/C Oxygen Reduction Reaction Catalysts: Structure-Regulating Oxygen Sorption. ACS Appl Mater Interfaces 2016; 8:6464-6471. [PMID: 26902179 DOI: 10.1021/acsami.5b11870] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Tuna is one of the most rapid and distant swimmers. Its unique gill structure with the porous lamellae promotes fast oxygen exchange that guarantees tuna's high metabolic and athletic demands. Inspired by this specific structure, we designed and fabricated microporous graphene nanoplatelets (GNPs)-based Fe/N/C electrocatalysts for oxygen reduction reaction (ORR). Careful control of GNP structure leads to the increment of microporosity, which influences the O2 adsorption positively and desorption oppositely, resulting in enhanced O2 diffusion, while experiencing reduced ORR kinetics. Working in the cathode of proton-exchange membrane fuel cells, the GNP catalysts require a compromise between adsorption/desorption for effective O2 exchange, and as a result, appropriate microporosity is needed. In this work, the highest power density, 521 mW·cm(-2), at zero back pressure is achieved.
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Affiliation(s)
| | | | - Gaixia Zhang
- Institut National de la Recherche Scientifique - Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
| | - Jianguo Liu
- Kunshan Sunlaite New Energy Co., Ltd., 1699# South Zuchongzhi Road, Suzhou, Kunshan, 215347, China
| | | | | | - Shuhui Sun
- Institut National de la Recherche Scientifique - Énergie, Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes, Quebec J3X 1S2, Canada
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Han SH, Doherty CM, Marmiroli B, Jo HJ, Buso D, Patelli A, Schiavuta P, Innocenzi P, Lee YM, Thornton AW, Hill AJ, Falcaro P. Simultaneous microfabrication and tuning of the permselective properties in microporous polymers using X-ray lithography. Small 2013; 9:2277-2282. [PMID: 23447493 DOI: 10.1002/smll.201202735] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 12/11/2012] [Indexed: 06/01/2023]
Abstract
Microchannels are fabricated using a photosensitive polymer to which microporosity is tuned with different X-ray doses. Using hard X-ray irradiation, the micropattern is positioned with various geometries in a multi-level, three-dimensional structure, while controlling the pore size and transport properties of small molecules. This highly reliable fabrication process has potential for use in microfluidic devices with enhanced transport properties through microchannels.
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Affiliation(s)
- Sang Hoon Han
- CSIRO Division of Materials Science and Engineering (CMSE), Private Bag 33, Clayton South MDC, Victoria 3169, Australia.
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Kang M, Gao H, Wang J, Ling L, Sun B. Prediction of Microporosity in Complex Thin-Wall Castings with the Dimensionless Niyama Criterion. Materials (Basel) 2013; 6:1789-802. [PMID: 28809243 DOI: 10.3390/ma6051789] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/07/2013] [Accepted: 04/10/2013] [Indexed: 11/16/2022]
Abstract
The dimensionless Niyama criterion was used to predict the formation of microporosity in nickel-based superalloy casting, which extended the model application from a simple plate casting to complex thin-wall superalloy casting. The physical characteristics of the superalloy were calculated by JMatPro software. The relation between the volume percentage of microporosity and the dimensionless Niyama values were constructed. Quantitative metallographic measurements of the microporosity of the practical thin-wall casting were carried out. The prediction agreed well with the experiment in general, except for some thick-wall sites in the casting.
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