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Liang J, Zhou Y, Wu Q, Zhu Z, Lin K, He J, Hong H, Luo Y. Superhydrophobic foam combined with biomass-derived TENG based on upcycled coconut husk for efficient oil-water separation. RSC Adv 2024; 14:13005-13015. [PMID: 38655467 PMCID: PMC11033976 DOI: 10.1039/d4ra01841a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Accepted: 04/13/2024] [Indexed: 04/26/2024] Open
Abstract
The ocean ecological environments are seriously affected by oil spilling and plastic-debris, preventing and significantly reducing marine pollution via using biocomposite production from natural fiber reinforcement is a more friendly way to deal with marine oil pollution. Herein, we upcycled coir-coconut into lignin and coconut shell into spherical TENG by a combination of dip-dry and chemical treatment and used the SiO2 nanoparticles together with cellulose nanofibrils to prepare serial sugar-templated, anisotropic and hybrid foams. The as-prepared lignin/SiO2 porous sponge (LSPS) with a hierarchical porous morphology and uniformly dispersed nanoparticles structure benefits from the advantages of biomass-based additives, which presents reversible large-strain deformation (50%) and high compressive strength (11.42 kpa). Notably, the LSPS was significantly more hydrophobic (WCA ≈150°) than pure silicone-based foams, and its selective absorbability can separate oil from water under continuous pumping. Meanwhile, the coconut husk was also upcycled as a spherical TENG shell by a combination of the nanofiber-enhanced polymer spherical oscillator (CESO), which possessed high triboelectric properties (Uoc = 272 V, Isc = 14.5 μA, Q = 70 nC) and was comparable to the plastic shell TENG at low frequency (1.6 Hz). The monolithic foam structure developed using this clean synthetic strategy holds considerable promise for new applications in sustainable petroleum contamination remediation.
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Affiliation(s)
- Jiaming Liang
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Yajuan Zhou
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Qian Wu
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Zeying Zhu
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Keda Lin
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Jinsheng He
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Haihe Hong
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
| | - Yuanzheng Luo
- School of Electronic and Information Engineering, Guangdong Ocean University Zhanjiang 524088 China
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2
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Bijender, Kumar S, Soni A, Yadav R, Singh SP, Kumar A. Noninvasive Blood Pressure Monitoring via a Flexible and Wearable Piezoresistive Sensor. ACS OMEGA 2024; 9:6355-6365. [PMID: 38375497 PMCID: PMC10876045 DOI: 10.1021/acsomega.3c04786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Revised: 12/22/2023] [Accepted: 01/18/2024] [Indexed: 02/21/2024]
Abstract
In the present global context, continuous blood pressure (BP) monitoring is paramount in addressing the global mortality rates attributed to hypertension. Achieving precise insights into the human cardiovascular system necessitates accurate measurement of BP, and the accuracy depends on the faithful recording of oscillations or pulsations. This task ultimately depends on the caliber of the pressure sensor embedded in the BP device. In this context, we have fabricated a flexible resistive pressure sensor based on reduced graphene oxide (rGO) and a polydimethylsiloxane (PDMS) sponge that is highly flexible and sensitive. The designed device operates effectively with a minimal bias voltage of 500 mV, at which point it showed its maximum relative change in current, reaching approximately 25%. Additionally, the sensing device showed a notable change in resistance values, exhibiting almost 100% change in resistance when subjected to a pressure of 400 mmHg and high sensitivity of 0.27 mmHg-1. After promising outcomes were obtained during static pressure measurement, the sensor was used for BP monitoring in humans. The sensor accurately traced the oscillometric waveform (OMW) for distinct systolic blood pressure (SBP) and diastolic blood pressure (DBP) combinations to cover a range of medical situations, including hypotension, standard or normal, and hypertension. The values of SBP, DBP, and MAP were derived from the sensor's output using the MAA technique, and the errors in these values concerning the simulator and the traditional BP monitor follow the universal AAMI/ESH/ISO protocols. Bland-Altman (B&A) correlation and scatter plots were used to compare the sensor's results and further validate the proposed sensor. The sensor showed the mean and standard deviation error in the SBP, DBP, and MBP of -0.2 ± 5.9, -0.5 ± 7, and -0.9 ± 4.7 mmHg when compared with the noninvasive blood pressure (NIBP) simulator. The pulse rate (PR) was also calculated from the same OMW for the specified value of 80 beats per minute (bpm) given by the simulator and reported a mean PR value of ∼81 bpm, close to the reference value. The findings show that the flexible resistive sensing device can accurately measure BP and replace the existing sensors of BP devices.
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Affiliation(s)
- Bijender
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Shubham Kumar
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Amit Soni
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rimjhim Yadav
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Surinder P. Singh
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Ashok Kumar
- CSIR-National
Physical Laboratory, Dr. K. S. Krishnan
Marg, New Delhi 110012, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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3
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Porpora F, Dei L, Duncan TT, Olivadese F, London S, Berrie BH, Weiss RG, Carretti E. Non-Aqueous Poly(dimethylsiloxane) Organogel Sponges for Controlled Solvent Release: Synthesis, Characterization, and Application in the Cleaning of Artworks. Gels 2023; 9:985. [PMID: 38131971 PMCID: PMC10742450 DOI: 10.3390/gels9120985] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/07/2023] [Accepted: 12/11/2023] [Indexed: 12/23/2023] Open
Abstract
Polydimethylsiloxane (PDMS) organogel sponges were prepared and studied in order to understand the role of pore size in an elastomeric network on the ability to uptake and release organic solvents. PDMS organogel sponges have been produced according to sugar leaching techniques by adding two sugar templates of different forms and grain sizes (a sugar cube template and a powdered sugar template), in order to obtain materials differing in porosity, pore size distribution, and solvent absorption and liquid retention capability. These materials were compared to PDMS organogel slabs that do not contain pores. The sponges were characterized by Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR) and compared with PDMS slabs that do not contain pores. Scanning electron microscopy (SEM) provided information about their morphology. X-ray micro-tomography (XMT) allowed us to ascertain how the form of the sugar templating agent influences the porosity of the systems: when templated with sugar cubes, the porosity was 77% and the mean size of the pores was ca. 300 μm; when templated with powdered sugar, the porosity decreased to ca. 10% and the mean pore size was reduced to ca. 75 μm. These materials, porous organic polymers (POPs), can absorb many solvents in different proportions as a function of their polarity. Absorption capacity, as measured by swelling with eight solvents covering a wide range of polarities, was investigated. Rheology data established that solvent absorption did not have an appreciable impact on the gel-like properties of the sponges, suggesting their potential for applications in cultural heritage conservation. Application tests were conducted on the surfaces of two different lab mock-ups that simulate real painted works of art. They demonstrated further that PDMS sponges are a potential innovative support for controlled and selective cleaning of works of art surfaces.
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Affiliation(s)
- Francesca Porpora
- Department of Chemistry “Ugo Schiff” & CSGI Consortium, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (F.P.); (L.D.); (F.O.)
| | - Luigi Dei
- Department of Chemistry “Ugo Schiff” & CSGI Consortium, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (F.P.); (L.D.); (F.O.)
| | | | - Fedora Olivadese
- Department of Chemistry “Ugo Schiff” & CSGI Consortium, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (F.P.); (L.D.); (F.O.)
| | - Shae London
- Department of Chemistry and Institute for Soft Matter Synthesis and Metrology, Georgetown University, 37th and O Streets NW, Washington, DC 20057, USA; (S.L.); (R.G.W.)
| | - Barbara H. Berrie
- Department of Scientific Research, National Gallery of Art, 2000 South Club Drive, Landover, MD 20785, USA;
| | - Richard G. Weiss
- Department of Chemistry and Institute for Soft Matter Synthesis and Metrology, Georgetown University, 37th and O Streets NW, Washington, DC 20057, USA; (S.L.); (R.G.W.)
| | - Emiliano Carretti
- Department of Chemistry “Ugo Schiff” & CSGI Consortium, University of Florence, Via della Lastruccia, 3-13, 50019 Sesto Fiorentino, Italy; (F.P.); (L.D.); (F.O.)
- National Research Council—National Institute of Optics (CNR-INO), Largo E. Fermi 6, 50125 Florence, Italy
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Rebane I, Levin KJ, Mäeorg U, Johanson U, Piirimägi P, Tätte T, Tamm T. Enhanced Low-Density Silicone Foams Blown by Water-Hydroxyl Blends. Polymers (Basel) 2023; 15:4425. [PMID: 38006148 PMCID: PMC10675139 DOI: 10.3390/polym15224425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Revised: 11/04/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023] Open
Abstract
Water, alcohols, diols, and glycerol are low-cost blowing agents that can be used to create the desired silicone foam structures. Although their combined use can be beneficial, it remains unclear how it affects the physical properties of the resulting materials. We conducted a comparative study of these hydroxyl-bearing blowing agents in fumed silica- and mica-filled polymer composite systems for simultaneous blowing and crosslinking to obtain a low-density, uniform porosity and superior mechanical properties. The foams were optimized for a uniform open-pore structure with densities ranging from 75 to 150 kg‧m-3. Varying the diol chain length (Cn) from one to seven carbons can alter the foam density and structure, thereby enhancing the foam tensile strength while maintaining a low density. Replacing 10 mol% of water with 1,4-butanediol decreased the density by 26%, while increasing the specific strength by 5%. By combining glycerol and water blowing, the resulting foams exhibited a 30% lower apparent density than their water-blown analogs. The results further showed that Cn > 4 alkane chain diols had an odd-even effect on the apparent density and cell wall thickness. All foamable compositions had viscosities of approximately 7000 cSt and curing times below 2 min, allowing for quick dispensing and sufficient time for the foam to cure in semi-industrial volumes.
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Affiliation(s)
- Ingrid Rebane
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia; (K.J.L.); (U.J.)
| | - Karl Jakob Levin
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia; (K.J.L.); (U.J.)
| | - Uno Mäeorg
- Institute of Chemistry, University of Tartu, Ravila 14a, 50411 Tartu, Estonia;
| | - Urmas Johanson
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia; (K.J.L.); (U.J.)
| | | | - Tauri Tätte
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia; (K.J.L.); (U.J.)
| | - Tarmo Tamm
- Institute of Technology, University of Tartu, Nooruse 1, 50411 Tartu, Estonia; (K.J.L.); (U.J.)
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5
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Bagdasarian IA, Tonmoy TI, Park BH, Morgan JT. In vitro formation and extended culture of highly metabolically active and contractile tissues. PLoS One 2023; 18:e0293609. [PMID: 37910543 PMCID: PMC10619834 DOI: 10.1371/journal.pone.0293609] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 10/16/2023] [Indexed: 11/03/2023] Open
Abstract
3D cell culture models have gained popularity in recent years as an alternative to animal and 2D cell culture models for pharmaceutical testing and disease modeling. Polydimethylsiloxane (PDMS) is a cost-effective and accessible molding material for 3D cultures; however, routine PDMS molding may not be appropriate for extended culture of contractile and metabolically active tissues. Failures can include loss of culture adhesion to the PDMS mold and limited culture surfaces for nutrient and waste diffusion. In this study, we evaluated PDMS molding materials and surface treatments for highly contractile and metabolically active 3D cell cultures. PDMS functionalized with polydopamine allowed for extended culture duration (14.8 ± 3.97 days) when compared to polyethylamine/glutaraldehyde functionalization (6.94 ± 2.74 days); Additionally, porous PDMS extended culture duration (16.7 ± 3.51 days) compared to smooth PDMS (6.33 ± 2.05 days) after treatment with TGF-β2 to increase culture contraction. Porous PDMS additionally allowed for large (13 mm tall × 8 mm diameter) constructs to be fed by diffusion through the mold, resulting in increased cell density (0.0210 ± 0.0049 mean nuclear fraction) compared to controls (0.0045 ± 0.0016 mean nuclear fraction). As a practical demonstration of the flexibility of porous PDMS, we engineered a vascular bioartificial muscle model (VBAM) and demonstrated extended culture of VBAMs anchored with porous PDMS posts. Using this model, we assessed the effect of feeding frequency on VBAM cellularity. Feeding 3×/week significantly increased nuclear fraction at multiple tissue depths relative to 2×/day. VBAM maturation was similarly improved in 3×/week feeding as measured by nuclear alignment (23.49° ± 3.644) and nuclear aspect ratio (2.274 ± 0.0643) relative to 2x/day (35.93° ± 2.942) and (1.371 ± 0.1127), respectively. The described techniques are designed to be simple and easy to implement with minimal training or expense, improving access to dense and/or metabolically active 3D cell culture models.
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Affiliation(s)
- Isabella A. Bagdasarian
- Department of Bioengineering, University of California, Riverside, CA, United States of America
| | - Thamidul Islam Tonmoy
- Department of Bioengineering, University of California, Riverside, CA, United States of America
| | - B. Hyle Park
- Department of Bioengineering, University of California, Riverside, CA, United States of America
| | - Joshua T. Morgan
- Department of Bioengineering, University of California, Riverside, CA, United States of America
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6
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Wang R, Jiang HX, Jia H, Li W, Chen Y, Tang AN, Shao B, Kong DM. Easily operated COF-based monolithic sponges as matrix clean-up materials for non-targeted analysis of chemical hazards in oil-rich foods. Talanta 2023; 255:124250. [PMID: 36610256 DOI: 10.1016/j.talanta.2023.124250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 12/15/2022] [Accepted: 01/02/2023] [Indexed: 01/09/2023]
Abstract
Non-targeted analysis of chemical hazards in foods plays a crucial role in controlling food safety. However, because it brings forward high demand for sample pretreatment, materials suitable for the pretreatment of foods, especially animal foods, are rare. Herein, covalent organic frameworks (COF)-based monolithic materials were constructed by three successive steps: preparation of polydimethylsiloxane (PDMS) sponge using sugar cube as a sacrificial template, loading of a heteroporous COF on PDMS sponge via ultrasonic or in-situ growth method, coating of the obtained PDMS@COF by polydopamine (PDA) network. As-prepared PDMS@COF@PDA sponges were demonstrated to work well in sample pretreatment of animal foods for non-targeted analysis of chemical hazards. After a simple vortex treatment for about 2 min, more than 98% triglycerides, the main interfering matrix components in animal foods, could be removed from lard and pork samples, accompanied by "full recovery" (recovery efficiencies: ≥63%) of 44 chemical hazards with different physicochemical properties. Besides providing promising sample pretreatment materials for non-targeted food safety analysis, this work also paves a feasible way to improve COF-based monolithic materials and thus promote their practical applications, because we found that the introduction of PDA network on COF-based monolithic material surface could play a role in "killing three birds with one stone": enhancing the stability of the materials by overcoming the detachment of COF during operations; controllably adjusting hydrophobic and hydrogen-bonding interactions on the material surface to promote the removal of triglycerides; weakening the hydrophobic and π-π interactions between COF and chemical hazards to increase the recoveries of chemical hazards.
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Affiliation(s)
- Rui Wang
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Hong-Xin Jiang
- Agro-Environmental Protection Institute, Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Laboratory of Environmental Factors Risk Assessment of Agro-Product Quality Safety, Ministry of Agriculture, Tianjin, 300191, PR China
| | - Hao Jia
- Agro-Environmental Protection Institute, Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Laboratory of Environmental Factors Risk Assessment of Agro-Product Quality Safety, Ministry of Agriculture, Tianjin, 300191, PR China
| | - Wei Li
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China.
| | - Yan Chen
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - An-Na Tang
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China
| | - Bing Shao
- Beijing Key Laboratory of Diagnostic and Traceability Technologies for Food Poisoning, Beijing Centre for Disease Preventive Medical Research, Beijing, 100013, PR China.
| | - De-Ming Kong
- State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin, 300071, PR China.
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7
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Ahuja P, Ujjain SK, Kukobat R, Urita K, Moriguchi I, Furuse A, Hattori Y, Fujimoto K, Rao G, Ge X, Wright T, Kaneko K. Air-permeable redox mediated transcutaneous CO 2 sensor. CHEMICAL ENGINEERING JOURNAL (LAUSANNE, SWITZERLAND : 1996) 2023; 457:141260. [PMID: 36620723 PMCID: PMC9804966 DOI: 10.1016/j.cej.2022.141260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/14/2022] [Accepted: 12/30/2022] [Indexed: 06/17/2023]
Abstract
Standard clinical care of neonates and the ventilation status of human patients affected with coronavirus disease involves continuous CO2 monitoring. However, existing noninvasive methods are inadequate owing to the rigidity of hard-wired devices, insubstantial gas permeability and high operating temperature. Here, we report a cost-effective transcutaneous CO2 sensing device comprising elastomeric sponges impregnated with oxidized single-walled carbon nanotubes (oxSWCNTs)-based composites. The proposed device features a highly selective CO2 sensing response (detection limit 155 ± 15 ppb), excellent permeability and reliability under a large deformation. A follow-up prospective study not only offers measurement equivalency to existing clinical standards of CO2 monitoring but also provides important additional features. This new modality allowed for skin-to-skin care in neonates and room-temperature CO2 monitoring as compared with clinical standard monitoring system operating at high temperature to substantially enhance the quality for futuristic applications.
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Affiliation(s)
- Preety Ahuja
- Research Initiative for Supra-Material, Shinshu University, Nagano 380-8553, Japan
- Center for Advanced Sensor Technology and Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Sanjeev Kumar Ujjain
- Research Initiative for Supra-Material, Shinshu University, Nagano 380-8553, Japan
- Center for Advanced Sensor Technology and Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Radovan Kukobat
- Center for Biomedical Research, Faculty of Medicine, University of Banja Luka, Banja Luka 78000, Bosnia and Herzegovina
| | - Koki Urita
- Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
| | - Isamu Moriguchi
- Graduate School of Engineering, Nagasaki University, Nagasaki 852-8521, Japan
| | - Ayumi Furuse
- Research Initiative for Supra-Material, Shinshu University, Nagano 380-8553, Japan
| | - Yoshiyuki Hattori
- Division of Chemistry and Materials, Faculty of Textile Science and Technology, Shinshu University, Ueda 386-8567, Japan
| | - Keisaku Fujimoto
- Omachi Municipal General Hospital, Omachi 398-0002, Japan
- School of Medicine, Shinshu University, Matsumoto 390-8621, Japan
| | - Govind Rao
- Center for Advanced Sensor Technology and Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Xudong Ge
- Center for Advanced Sensor Technology and Department of Chemical, Biochemical and Environmental Engineering, University of Maryland, Baltimore County, Baltimore, MD 21250, USA
| | - Thelma Wright
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Katsumi Kaneko
- Research Initiative for Supra-Material, Shinshu University, Nagano 380-8553, Japan
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8
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Chen C, Wang Y, Jiang W, Zhu C, Yao S. Transdermal release behaviors of bioactive deep eutectic solvents as natural skin care and mechanism. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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9
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Lantean S, Lo Preti M, Beccai L. Stretchable reflective coating for soft optical waveguides and sensors. SOFT MATTER 2022; 18:7827-7837. [PMID: 36196858 DOI: 10.1039/d2sm00869f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Soft robots must embody mechanosensing capabilities to merge with and act in the environment. Stretchable waveguides are making a mark in soft mechanical sensing since they are built from pristine elastomers. Therefore, they are insensitive to electromagnetic fields and weakly affect the deformations of the robot. However, issues in light-shielding, signal decoupling, and core-cladding interfaces are still open challenges. In this work, titanium oxide particles (TiO2) are dispersed in silicone elastomers to develop a soft optical shield coating. Results show that the added particles do not harden the matrix and reduce light transmission. Almost full NIR shielding is achieved by adding 1.0 vol% of TiO2 in 150 μm thick films. These properties make the proposed shielding coating an excellent candidate for soft mechanosensing. An open-access tool is developed to design soft optical devices by programming light transmittance at desired wavelengths by tuning, both, TiO2 concentration and film thickness. Finally, two proof-of-concepts are demonstrated, a soft waveguide and a soft strain sensor, by integrating the developed material to shield a transparent PDMS resin and a semi-transparent Ecoflex00-10 matrix, respectively. The soft waveguide can stretch up to 40% with very low optical loss, while the optical strain sensor can detect strain up to 90%. In both cases, bending, folding, and indentation of the devices have a significantly low impact on light transmission. These results can pave the way to design new optical transmission devices and sensors that exploit light reflection and that allow for discriminating different types of mechanical stimuli in soft robots.
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Affiliation(s)
- Simone Lantean
- Soft BioRobotics Perception, Istituto Italiano di Tecnologia (IIT), Genova, Italy.
| | - Matteo Lo Preti
- Soft BioRobotics Perception, Istituto Italiano di Tecnologia (IIT), Genova, Italy.
- The BioRobotics Institute, Scuola Superiore Sant'Anna, Pontedera, Italy
| | - Lucia Beccai
- Soft BioRobotics Perception, Istituto Italiano di Tecnologia (IIT), Genova, Italy.
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10
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Caniato M, Cozzarini L, Schmid C, Gasparella A. A sustainable acoustic customization of open porous materials using recycled plastics. Sci Rep 2022; 12:10955. [PMID: 35768484 PMCID: PMC9242981 DOI: 10.1038/s41598-022-14009-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 05/31/2022] [Indexed: 11/18/2022] Open
Abstract
Foams are commonly used as sound absorbers and thermal insulators for many industrial and construction applications. The insulating materials market is currently dominated by inorganic fibres like glass and mineral wool, as well as plastic foams. However, worldwide plastics consumption produces huge amounts of waste, generating concerns about soil, air and especially seawater pollution. Hence, new methods for recycling marine microplastic litter according to cleaner production criteria are being sought. This paper presents a novel, sustainable and eco-friendly foamy material made of microplastic waste, namely polyethylene terephthalate (PET) and polystyrene (PS), incorporated into a bio-based matrix. Samples with different compositions were prepared and then characterized for sound absorption properties. Evidence is presented of very good acoustic performances and of how the acoustic characteristics of the end product can be customized using different microplastic content and type. This allows envisioning many industrial and civil applications for this novel open-cell material.
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Affiliation(s)
- Marco Caniato
- Faculty of Science and Technology, Free University of Bozen, 39100, Bolzano, Italy.
| | - Luca Cozzarini
- Department of Engineering and Architecture, University of Trieste, 34127, Trieste, Italy
| | - Chiara Schmid
- Department of Engineering and Architecture, University of Trieste, 34127, Trieste, Italy
| | - Andrea Gasparella
- Faculty of Science and Technology, Free University of Bozen, 39100, Bolzano, Italy
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11
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Li S, Nguyen SV, Lee BK. Role of heat treatment in improving replication quality of PDMS double-casting. SOFT MATTER 2022; 18:3473-3478. [PMID: 35475435 DOI: 10.1039/d1sm01828k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
An efficient and eco-friendly method utilizing the heat treatment of the PDMS master is proposed for improving the replication quality of PDMS double-casting. The effects of heat treatment on interfacial adhesion are investigated in terms of uncured low molecular weight chains, surface energy, and surface roughness. The PDMS master treated at 150 °C for 72 h shows the highest replication quality of micropatterns with a diameter and height of 30 μm.
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Affiliation(s)
- Shichen Li
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
| | - Son Van Nguyen
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
| | - Bong-Kee Lee
- School of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.
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12
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Loading of Polydimethylsiloxane with a Human ApoB-Derived Antimicrobial Peptide to Prevent Bacterial Infections. Int J Mol Sci 2022; 23:ijms23095219. [PMID: 35563610 PMCID: PMC9103716 DOI: 10.3390/ijms23095219] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 04/28/2022] [Accepted: 05/04/2022] [Indexed: 01/02/2023] Open
Abstract
Background: medical device-induced infections affect millions of lives worldwide and innovative preventive strategies are urgently required. Antimicrobial peptides (AMPs) appear as ideal candidates to efficiently functionalize medical devices surfaces and prevent bacterial infections. In this scenario, here, we produced antimicrobial polydimethylsiloxane (PDMS) by loading this polymer with an antimicrobial peptide identified in human apolipoprotein B, r(P)ApoBLPro. Methods: once obtained loaded PDMS, its structure, anti-infective properties, ability to release the peptide, stability, and biocompatibility were evaluated by FTIR spectroscopy, water contact angle measurements, broth microdilution method, time-killing kinetic assays, quartz crystal microbalance analyses, MTT assays, and scanning electron microscopy analyses. Results: PDMS was loaded with r(P)ApoBLPro peptide which was found to be present not only in the bulk matrix of the polymer but also on its surface. ApoB-derived peptide was found to retain its antimicrobial properties once loaded into PDMS and the antimicrobial material was found to be stable upon storage at 4 °C for a prolonged time interval. A gradual and significant release (70% of the total amount) of the peptide from PDMS was also demonstrated upon 400 min incubation and the antimicrobial material was found to be endowed with anti-adhesive properties and with the ability to prevent biofilm attachment. Furthermore, PDMS loaded with r(P)ApoBLPro peptide was found not to affect the viability of eukaryotic cells. Conclusions: an easy procedure to functionalize PDMS with r(P)ApoBLPro peptide has been here developed and the obtained functionalized material has been found to be stable, antimicrobial, and biocompatible.
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13
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Ma D, Chen B, Li Y, Pang X, Fu Q, Xiao Z, Shi Z, Li X, Luo C, Zhou Z, Chen Y, Zhou J. Au@Ag Nanorods-PDMS Wearable Mouthguard as a Visualized Detection Platform for Screening Dental Caries and Periodontal Diseases. Adv Healthc Mater 2022; 11:e2102682. [PMID: 34957703 DOI: 10.1002/adhm.202102682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 12/19/2021] [Indexed: 11/10/2022]
Abstract
The development of easy-to-use, low-cost, and visualized detection platforms for screening human dental caries and periodontal diseases is in urgent demand. In this work, a Au@Ag nanorods-poly(dimethylsiloxane) (Au@Ag NRs-PDMS) wearable mouthguard, which can visualize the tooth lesion sites through the color change of it at the corresponding locations, is presented. The Au@Ag NRs-PDMS composite exhibits a distinct color response to hydrogen sulfide (H2 S) gas generated by bacterial decay at the lesion sites. Moreover, the Au@Ag NRs-PDMS mouthguard is demonstrated to own desired mechanical properties, excellent chemical stability, as well as good biocompatibility, and can accurately locate the lesion sites in human oral cavity. These findings suggest that the mouthguard has the potential to be utilized on a large scale to help people self-monitor their oral health in daily life, and treat oral diseases locally.
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Affiliation(s)
- Dongxu Ma
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Baiqi Chen
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Yuanfang Li
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Xueyuan Pang
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Quanying Fu
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Zihan Xiao
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Zhonghong Shi
- State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat‐sen University Guangzhou 510275 China
| | - Xiaolei Li
- Department of Orthodontics Guanghua School of Stomatology Hospital of Stomatology Sun Yat‐sen University Guangzhou 510055 China
| | - Chongdai Luo
- Department of Stomatology Guangzhou Women and Children's Medical Center Guangzhou 510275 China
| | - Zhang‐kai Zhou
- State Key Laboratory of Optoelectronic Materials and Technologies School of Physics Sun Yat‐sen University Guangzhou 510275 China
| | - Yin Chen
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
| | - Jianhua Zhou
- Guangdong Provincial Key Laboratory of Sensing Technology and Biomedical Instruments School of Biomedical Engineering Sun Yat‐sen University Guangzhou 510275 China
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14
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Hu WJ, Xia QQ, Pan HT, Chen HY, Qu YX, Chen ZY, Zhang GD, Zhao L, Gong LX, Xue CG, Tang LC. Green and Rapid Preparation of Fluorosilicone Rubber Foam Materials with Tunable Chemical Resistance for Efficient Oil-Water Separation. Polymers (Basel) 2022; 14:polym14081628. [PMID: 35458379 PMCID: PMC9028597 DOI: 10.3390/polym14081628] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/10/2022] [Accepted: 04/15/2022] [Indexed: 11/16/2022] Open
Abstract
Polydimethylsiloxane (PDMS) foam materials with lightweight, excellent oil resistance and mechanical flexibility are highly needed for various practical applications in aerospace, transportation, and oil/water separation. However, traditional PDMS foam materials usually present poor chemical resistance and easily swell in various solvents, which greatly limits their potential application. Herein, novel fluorosilicone rubber foam (FSiRF) materials with different contents of trifluoropropyl lateral groups were designed and fabricated by a green (no solvents used) and rapid (<10 min foaming process) foaming/crosslinking approach at ambient temperature. Typically, vinyl-terminated poly(dimethyl-co-methyltrifluoropropyl) siloxanes with different fluorine contents of 0−50 mol% were obtained through ring-opening polymerization to effectively adjust the chemical resistance of the FSiRFs. Notably, the optimized FSiRF samples exhibit lightweight (~0.25 g/cm−3), excellent hydrophobicity/oleophilicity (WCA > 120°), reliable mechanical flexibility (complete recovery ability after stretching of 130% strain or compressing of >60%), and improved chemical resistance and structural stability in various solvents, making them promising candidates for efficient and continuous oil−water separation. This work provides an innovative concept to design and prepare advanced fluorosilicone rubber foam materials with excellent chemical resistance for potential oil−water separation application.
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Affiliation(s)
- Wan-Jun Hu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Qiao-Qi Xia
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Hong-Tao Pan
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Hai-Yang Chen
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Yong-Xiang Qu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Zuan-Yu Chen
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Guo-Dong Zhang
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
- Correspondence: (G.-D.Z.); (L.-C.T.)
| | - Li Zhao
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Li-Xiu Gong
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
| | - Chang-Guo Xue
- School of Material Science and Engineering, Anhui University of Science and Technology, Huainan 232001, China;
| | - Long-Cheng Tang
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China; (W.-J.H.); (Q.-Q.X.); (H.-T.P.); (H.-Y.C.); (Y.-X.Q.); (Z.-Y.C.); (L.Z.); (L.-X.G.)
- Key Laboratory of Silicone Materials Technology of Zhejiang Province, Hangzhou Normal University, Hangzhou 311121, China
- Correspondence: (G.-D.Z.); (L.-C.T.)
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15
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Yue X, Zhang Z, Zhang T, Yang D, Xu J, Qiu F. Simply realizing durable PVDF/candle soot foam with excellent solar absorption for solar-assisted recovery of heavy oil spill. J Taiwan Inst Chem Eng 2021. [DOI: 10.1016/j.jtice.2021.08.036] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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16
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Tziourrou P, Kordella S, Ardali Y, Papatheodorou G, Karapanagioti HK. Microplastics formation based on degradation characteristics of beached plastic bags. MARINE POLLUTION BULLETIN 2021; 169:112470. [PMID: 34049063 DOI: 10.1016/j.marpolbul.2021.112470] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 04/06/2021] [Accepted: 05/07/2021] [Indexed: 05/05/2023]
Abstract
Environmental pollution from plastic bags is a significant issue in the global environment. Plastic bags can be transferred by the wind and ocean currents everywhere in the three dimensions and be fragmented into small particles, termed film-shaped microplastics. The purpose of this study is to provide insights on the degradation of beached plastic bags. Monitoring and sampling were performed to determine plastic bag fragmentation and the possible mechanisms. On selected samples, various spectroscopic techniques and microscopy were used. Before the imposition of the "green" plastic bag fee in Greece, field monitoring suggested that the majority of the coastal plastic bags were fragmented whereas after the "green" fee, less fragmented bags were observed. Evidence of three degradation mechanisms were observed in this study. For oxodegradable plastic bags, degradation takes place for the starch additives and the polymer part stays in the environment as microplastic particles. For thin light density polyethylene plastic bags, mechanical fragmentation takes place in the environment creating microplastics before significant chemical alterations in functional groups were observed and once chemical alteration (oxidation) is observed, fragmentation (of HC or CC bonds) is also taking place. Thus, regulating thin plastic bags usage removes problems related to plastic bags but also to film-shaped microplastics.
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Affiliation(s)
- P Tziourrou
- Department of Chemistry, University of Patras, Patras, Greece
| | - S Kordella
- Laboratory of Marine Geology and Physical Oceanography, Department of Geology, University of Patras, Patras, Greece
| | - Y Ardali
- Department of Environmental Engineering, Ondokuz Mayis University, Samsun, Turkey
| | - G Papatheodorou
- Laboratory of Marine Geology and Physical Oceanography, Department of Geology, University of Patras, Patras, Greece
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17
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Investigation of the Thermal Conductivity of Silicon-Base Composites: The Effect of Filler Materials and Characteristic on Thermo-Mechanical Response of Silicon Composite. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11125663] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Thermal conductivity is a key property in many applications from electronic to informatics. The interaction of fillers with Sylgard 184 was studied; this study explores new composites and the influence of metal particles (copper and nickel), carbon-based materials (carbon nanotubes and carbon black), and ceramic nanoparticles (boron nitride) as fillers to enhance thermal properties of silicon-based composites. The effect of the fillers on the final performances of the composite materials was evaluated. The influence of filler volume, dimension, morphology, and chemical nature is studied. Specifically, FT-IR analysis was used to evaluate curing of the polymer matrix. DSC was used to confirm the data and to further characterize the composites. Thermo-mechanical properties were studied by DMTA. The filler morphology was analyzed by SEM. Finally, thermal conductivity was studied and compared, enlightening the correlation with the features of the fillers. The results demonstrate a remarkable dependence among the type, size, and shape of the filler, and thermal properties of the composite materials. Underlining a that the volume filler influenced the thermal conductivity obtaining the best results with the highest added volume filler and higher positive impact on the k of the composites is reached with large particles and with irregular shapes. In contrast, the increase of filler amount affects the rigidity of the silicon-matrix, increasing the rigidity of the silicon-based composites.
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18
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Yu C, Youn JR, Song YS. Enhancement in thermo‐electric energy harvesting efficiency by embedding
PDMS
in form‐stable
PCM
composites. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5419] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Chengbin Yu
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM) Seoul National University Seoul South Korea
| | - Jae Ryoun Youn
- Department of Materials Science and Engineering, Research Institute of Advanced Materials (RIAM) Seoul National University Seoul South Korea
| | - Young Seok Song
- Department of Fiber Convergence Materials Engineering Dankook University Gyeonggi‐do South Korea
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19
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Nieuwelink AE, Vollenbroek JC, Ferreira de Abreu AC, Tiggelaar RM, van den Berg A, Odijk M, Weckhuysen BM. Single catalyst particle diagnostics in a microreactor for performing multiphase hydrogenation reactions. Faraday Discuss 2021; 229:267-280. [PMID: 33666611 DOI: 10.1039/d0fd00006j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Since inter- and intra-particle heterogeneities in catalyst particles are more the rule than the exception, it is advantageous to perform high-throughput screening for the activity of single catalyst particles. A multiphase system (gas/liquid/solid) is developed, where droplet-based microfluidics and optical detection are combined for the analysis of single catalyst particles by safely performing a hydrogenation study on in-house synthesized hollow Pd/SiO2 catalyst microparticles, in a polydimethylsiloxane (PDMS) microreactor. A two-phase segmented flow system of particle-containing droplets is combined with a parallel gas-reactant channel separated from the flow channel by a 50 μm thick gas permeable PDMS wall. In this paper, the developed microreactor system is showcased by monitoring the Pd-catalyzed hydrogenation of methylene blue. A discoloration of blue to brown visualizes the hydrogenation activity happening in a high-throughput fashion on the single Pd/SiO2 spherical catalyst microparticles, which are encapsulated in 50 nL-sized droplets. By measuring the reagent concentration at various spots along the length of the channel the reaction time can be determined, which is proportional to the residence time in the channel. The developed experimental platform opens new possibilities for single catalyst particle diagnostics in a multiphase environment.
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Affiliation(s)
- Anne-Eva Nieuwelink
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands.
| | - Jeroen C Vollenbroek
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
| | - Andrea C Ferreira de Abreu
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands.
| | - Roald M Tiggelaar
- MESA+ NanoLab Cleanroom, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
| | - Albert van den Berg
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
| | - Mathieu Odijk
- BIOS-Lab on a Chip Group, MESA+ Institute for Nanotechnology, University of Twente, The Netherlands
| | - Bert M Weckhuysen
- Inorganic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Utrecht University, The Netherlands.
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20
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Cutroneo M, Havranek V, Mackova A, Malinsky P, Torrisi A, Silipigni L, Slepicka P, Fajstavr D, Torrisi L. The characterisation of polydimethylsiloxane containing gold nanoparticles as a function of curing time. SURF INTERFACE ANAL 2021. [DOI: 10.1002/sia.6948] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Mariapompesa Cutroneo
- Department of Neutron Physics Nuclear Physics Institute, AS CR Rez 25068 Czech Republic
| | - Vladimír Havranek
- Department of Neutron Physics Nuclear Physics Institute, AS CR Rez 25068 Czech Republic
| | - Anna Mackova
- Department of Neutron Physics Nuclear Physics Institute, AS CR Rez 25068 Czech Republic
- Department of Physics, Faculty of Science University of J. E. Purkyně České mládeže 8 Ústí nad Labem 400 96 Czech Republic
| | - Petr Malinsky
- Department of Neutron Physics Nuclear Physics Institute, AS CR Rez 25068 Czech Republic
- Department of Physics, Faculty of Science University of J. E. Purkyně České mládeže 8 Ústí nad Labem 400 96 Czech Republic
| | - Alfio Torrisi
- Department of Neutron Physics Nuclear Physics Institute, AS CR Rez 25068 Czech Republic
| | - Letteria Silipigni
- Department of Mathematics and Computer Sciences, Physics Sciences and Earth Sciences (MIFT) Messina University V. le F.S. d’ Alcontres 31 S. Agata, Messina 98166 Italy
| | - Petr Slepicka
- Department of Solid State Engineering Institute of Chemical Technology Prague 166 28 Czech Republic
| | - Dominik Fajstavr
- Department of Solid State Engineering Institute of Chemical Technology Prague 166 28 Czech Republic
| | - Lorenzo Torrisi
- Department of Mathematics and Computer Sciences, Physics Sciences and Earth Sciences (MIFT) Messina University V. le F.S. d’ Alcontres 31 S. Agata, Messina 98166 Italy
- Department of Physics INFN_Sezione Catania Via S. Sofia 64 Catania 95123 Italy
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21
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Liu X, Fu J, Wang L, Wang C. Polydimethylsiloxane/ZIF-8@GO sponge headspace solid-phase extraction followed by GC-MS for the analysis of lavender essential oil. Anal Biochem 2021; 622:114167. [PMID: 33722580 DOI: 10.1016/j.ab.2021.114167] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 03/03/2021] [Accepted: 03/04/2021] [Indexed: 10/21/2022]
Abstract
A novel microwave-assisted (MA) headspace solid-phase extraction (HS-SPE) based on polydimethylsiloxane (PDMS)/ZIF-8@GO sponge was developed for the simultaneous extraction and determination of essential oil constituents in lavender. The PDMS/ZIF-8@GO sponge with a high surface area and excellent adsorption capacity was successfully applied in the HS-SPE process. Microwave-assisted coupled with PDMS/ZIF-8@GO sponge headspace solid-phase extraction followed by GC-MS was proposed. Different experimental parameters were investigated. The optimal conditions were found to be as follows: 2:1 as the quality ratio of ZIF-8 to GO, ZIF-8@GO dosage of 30 mg, microwave power of 600 W, extraction time of 10 min and desorption solvent of n-hexane. This method was successfully applied to the analysis of 11 samples of lavender in different varieties. A total of 52 compounds were identified by the proposed method. A good linearity was observed from 14 to 800 ng with a correlation coefficient (R2) value of >0.99. Multivariate statistical analysis was used to establish the relationship between the varieties and the volatile components for further discriminant analysis. These results demonstrated that the MA-PDMS/ZIF-8@GO is an efficient, sensitive and small sample consumption method for the determination of the essential oil in dried plant materials.
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Affiliation(s)
- Xin Liu
- Key Laboratory of Oil & Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region, Xinjiang University, Urumqi, 830046, Xinjiang, China
| | - Jihong Fu
- Key Laboratory of Oil & Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region, Xinjiang University, Urumqi, 830046, Xinjiang, China.
| | - Lili Wang
- Key Laboratory of Oil & Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region, Xinjiang University, Urumqi, 830046, Xinjiang, China
| | - Caijuan Wang
- Key Laboratory of Oil & Gas Fine Chemicals Ministry of Education & Xinjiang Uyghur Autonomous Region, Xinjiang University, Urumqi, 830046, Xinjiang, China
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22
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Gwon K, Kim Y, Cho H, Lee S, Yang SH, Kim SJ, Lee DN. Robust Copper Metal-Organic Framework-Embedded Polysiloxanes for Biomedical Applications: Its Antibacterial Effects on MRSA and In Vitro Cytotoxicity. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:719. [PMID: 33809285 PMCID: PMC8000151 DOI: 10.3390/nano11030719] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Revised: 03/04/2021] [Accepted: 03/08/2021] [Indexed: 12/15/2022]
Abstract
Polysiloxanes (PSs) have been widely utilized in the industry as lubricants, varnishes, paints, release agents, adhesives, and insulators. In addition, their applications have been expanded to include the development of new biomedical materials. To modify PS for application in therapeutic purposes, a flexible antibacterial Cu-MOF (metal-organic framework) consisting of glutarate and 1,2-bis(4-pyridyl)ethane ligands was embedded in PS via a hydrosilylation reaction of vinyl-terminated and H-terminated PSs at 25 °C. The bactericidal activities of the resulting Cu-MOF-embedded PS (PS@Cu-MOF) and the control polymer (PS) were tested against Escherichia coli, Staphylococcus aureus, and methicillin-resistant Staphylococcus aureus. PS@Cu-MOF exhibited more than 80% bactericidal activity toward the tested bacteria at a concentration of 100 μg⋅mL-1 and exhibited a negligible cytotoxicity toward mouse embryonic fibroblasts at the same concentration. Release tests of the Cu(II) ion showed PS@Cu-MOF to be particularly stable in a phosphate-buffered saline solution. Furthermore, its physical and thermal properties, including the phase transition, rheological measurements, swelling ratio, and thermogravimetric profile loss, were similar to those of the control polymer. Moreover, the low cytotoxicity and bactericidal activities of PS@Cu-MOF render it a promising candidate for use in medicinal applications, such as in implants, skin-disease treatment, wound healing, and drug delivery.
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Affiliation(s)
- Kihak Gwon
- Ingenium College of Liberal Arts (Chemistry), Kwangwoon University, Seoul 01897, Korea; (K.G.); (S.L.)
| | - Youngmee Kim
- Department of Chemistry and Nano Science, Institute of Nano-Bio Technology, Ewha Womans University, Seoul 03760, Korea; (Y.K.); (S.-H.Y.); (S.-J.K.)
| | - Hyunjun Cho
- Department of Chemistry, Dongguk University, Seoul 04620, Korea;
| | - Seonhwa Lee
- Ingenium College of Liberal Arts (Chemistry), Kwangwoon University, Seoul 01897, Korea; (K.G.); (S.L.)
| | - So-Hyeon Yang
- Department of Chemistry and Nano Science, Institute of Nano-Bio Technology, Ewha Womans University, Seoul 03760, Korea; (Y.K.); (S.-H.Y.); (S.-J.K.)
| | - Sung-Jin Kim
- Department of Chemistry and Nano Science, Institute of Nano-Bio Technology, Ewha Womans University, Seoul 03760, Korea; (Y.K.); (S.-H.Y.); (S.-J.K.)
| | - Do Nam Lee
- Ingenium College of Liberal Arts (Chemistry), Kwangwoon University, Seoul 01897, Korea; (K.G.); (S.L.)
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23
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Park B, Jung Y, Ko JS, Park J, Cho H. Self-Restoring Capacitive Pressure Sensor Based on Three-Dimensional Porous Structure and Shape Memory Polymer. Polymers (Basel) 2021; 13:polym13050824. [PMID: 33800342 PMCID: PMC7962847 DOI: 10.3390/polym13050824] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Revised: 03/04/2021] [Accepted: 03/04/2021] [Indexed: 01/28/2023] Open
Abstract
Highly flexible and compressible porous polyurethane (PU) structures have effectively been applied in capacitive pressure sensors because of the good elastic properties of the PU structures. However, PU porous structure-based pressure sensors have been limited in practical applications owing to their low durability during pressure cycling. Herein, we report a flexible pressure sensor based on a three-dimensional porous structure with notable durability at a compressive pressure of 500 kPa facilitated by the use of a shape memory polymer (SMP). The SMP porous structure was fabricated using a sugar templating process and capillary effect. The use of the SMP resulted in the maintenance of the sensing performance for 100 cycles at 500 kPa; the SMP can restore its original shape within 30 s of heating at 80 °C. The pressure sensor based on the SMP exhibited a higher sensitivity of 0.0223 kPa−1 than a typical PU-based sensor and displayed excellent sensing performance in terms of stability, response time, and hysteresis. Additionally, the proposed sensor was used to detect shoe insole pressures in real time and exhibited remarkable durability and motion differentiation.
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Affiliation(s)
- Byunggeon Park
- Precision Mechanical Process and Control R&D Group, Korea Institute of Industrial Technology, 42-7, Baegyang-daero 804beon-gil, Sasang-gu, Busan 46938, Korea; (B.P.); (Y.J.)
- Graduate School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea;
| | - Young Jung
- Precision Mechanical Process and Control R&D Group, Korea Institute of Industrial Technology, 42-7, Baegyang-daero 804beon-gil, Sasang-gu, Busan 46938, Korea; (B.P.); (Y.J.)
- Graduate School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea;
| | - Jong Soo Ko
- Graduate School of Mechanical Engineering, Pusan National University, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan 46241, Korea;
| | - Jinhyoung Park
- School of Mechatronics Engineering, Korea University of Technology & Education, 600, Chungjeol-ro, Byeongcheon-myeon, Dongnam-gu, Chungcheongnam-do, Cheonan-si 31253, Korea
- Correspondence: (J.P.); (H.C.)
| | - Hanchul Cho
- Precision Mechanical Process and Control R&D Group, Korea Institute of Industrial Technology, 42-7, Baegyang-daero 804beon-gil, Sasang-gu, Busan 46938, Korea; (B.P.); (Y.J.)
- Correspondence: (J.P.); (H.C.)
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Silicon-Containing Polymeric Materials. Polymers (Basel) 2021; 13:polym13020188. [PMID: 33430192 PMCID: PMC7825594 DOI: 10.3390/polym13020188] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 01/04/2021] [Indexed: 11/16/2022] Open
Abstract
When thinking about a chemical element that has contributed to the technological progress over the last two centuries, carbon and all carbon-based materials immediately come to mind [...].
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25
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Smith JA, Li S, Mele E, Goulas A, Engstrøm D, Silberschmidt VV. Printability and mechanical performance of biomedical PDMS-PEEK composites developed for material extrusion. J Mech Behav Biomed Mater 2021; 115:104291. [PMID: 33421949 DOI: 10.1016/j.jmbbm.2020.104291] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2020] [Revised: 12/18/2020] [Accepted: 12/21/2020] [Indexed: 11/16/2022]
Abstract
Polydimethylsiloxane (PDMS) materials are widely adopted in the manufacture of facial prostheses, lab-on-chip devices and scaffolds for soft-tissue engineering applications; however, their processing by additive manufacturing (AM) has proved challenging. Liquid silicone rubbers (LSRs) are favoured for their high shape fidelity when cast, but their low viscosity and surface tension often prevent self-support, post-extrusion. Poly(ether) ether ketone (PEEK) particle reinforcement through interfacial bonding has proven to enhance key properties of PDMS, expanding their end-use functionality. Still, the impact of such particles on the printability of LSR-PDMS is not explored. In this study, for the first time, solvent-free biocompatible PDMS-PEEK composites (up to 30 wt% PEEK) were successfully characterised for material extrusion (ME) printing. Rheological analysis confirmed shear-thinning of all PDMS-PEEK composites under applied load (within the tolerances of the printer) and dominant storage moduli at rest (i.e. prints can self-support), considered highly desirable for ME-based printing. Attained rheological datasets were used to guide initial printability studies, which revealed finer track fidelity with rising fractional content of PEEK, at comparable print speed and displacement values. Composites with higher PEEK content demonstrated significant increases in Shore A hardness and stiffness (in tension and compression) in bulk form. Last but not least, enhanced shape fidelity (thanks to PEEK reinforcement) and geometrical autonomy further expanded the manufacturing freedom of PDMS, whereby infill density could be controlled in order to increase the range of mechanical performance, previously unachievable with conventional casting fabrication. Fundamentally, this could lead to the manufacture of bespoke spatially graded multi-material structures and devices that could be used to replicate the heterogenous properties of soft human tissues and in other advanced material applications.
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Affiliation(s)
- James A Smith
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK.
| | - Simin Li
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Elisa Mele
- Department of Materials, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Athanasios Goulas
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Daniel Engstrøm
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
| | - Vadim V Silberschmidt
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, Leicestershire, LE11 3TU, UK
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26
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Kwak Y, Kang Y, Park W, Jo E, Kim J. Fabrication of fine-pored polydimethylsiloxane using an isopropyl alcohol and water mixture for adjustable mechanical, optical, and thermal properties. RSC Adv 2021; 11:18061-18067. [PMID: 35480166 PMCID: PMC9033208 DOI: 10.1039/d1ra02466c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/06/2021] [Indexed: 11/21/2022] Open
Abstract
A fabrication method for obtaining fine-pored PDMS is presented. Low-cost, volatile, and easily accessible IPA is used as a co-solvent in water and PDMS emulsions, allowing porous PDMS with adjustable mechanical, optical and thermal properties.
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Affiliation(s)
- Yeunjun Kwak
- School of Mechanical Engineering
- Yonsei University
- Seoul
- Republic of Korea
| | - Yunsung Kang
- School of Mechanical Engineering
- Yonsei University
- Seoul
- Republic of Korea
| | - Wonkeun Park
- School of Mechanical Engineering
- Yonsei University
- Seoul
- Republic of Korea
| | - Eunhwan Jo
- School of Mechanical Engineering
- Yonsei University
- Seoul
- Republic of Korea
| | - Jongbaeg Kim
- School of Mechanical Engineering
- Yonsei University
- Seoul
- Republic of Korea
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27
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Adaptive self-healing electronic epineurium for chronic bidirectional neural interfaces. Nat Commun 2020; 11:4195. [PMID: 32826916 PMCID: PMC7442836 DOI: 10.1038/s41467-020-18025-3] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Accepted: 07/31/2020] [Indexed: 12/21/2022] Open
Abstract
Realizing a clinical-grade electronic medicine for peripheral nerve disorders is challenging owing to the lack of rational material design that mimics the dynamic mechanical nature of peripheral nerves. Electronic medicine should be soft and stretchable, to feasibly allow autonomous mechanical nerve adaptation. Herein, we report a new type of neural interface platform, an adaptive self-healing electronic epineurium (A-SEE), which can form compressive stress-free and strain-insensitive electronics-nerve interfaces and enable facile biofluid-resistant self-locking owing to dynamic stress relaxation and water-proof self-bonding properties of intrinsically stretchable and self-healable insulating/conducting materials, respectively. Specifically, the A-SEE does not need to be sutured or glued when implanted, thereby significantly reducing complexity and the operation time of microneurosurgery. In addition, the autonomous mechanical adaptability of the A-SEE to peripheral nerves can significantly reduce the mechanical mismatch at electronics-nerve interfaces, which minimizes nerve compression-induced immune responses and device failure. Though a small amount of Ag leaked from the A-SEE is observed in vivo (17.03 ppm after 32 weeks of implantation), we successfully achieved a bidirectional neural signal recording and stimulation in a rat sciatic nerve model for 14 weeks. In view of our materials strategy and in vivo feasibility, the mechanically adaptive self-healing neural interface would be considered a new implantable platform for a wide range application of electronic medicine for neurological disorders in the human nervous system. Electronic implantable devices should be soft and stretchable, such that nerves can adapt mechanically and autonomously. Here, the authors present an adaptive self-healing electronic epineurium which can form compressive stress-free and strain-insensitive electronics-nerve interfaces.
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Novel Low-Temperature Chemical Vapor Deposition of Hydrothermal Delignified Wood for Hydrophobic Property. Polymers (Basel) 2020; 12:polym12081757. [PMID: 32781550 PMCID: PMC7463729 DOI: 10.3390/polym12081757] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 08/01/2020] [Accepted: 08/03/2020] [Indexed: 11/17/2022] Open
Abstract
As a hydrophilic material, wood is difficult to utilize for external applications due to the variable weather conditions. In this study, an efficient, facile, and low-cost method was developed to enhance the hydrophobicity of wood. By applying the low-temperature chemical vapor deposition (CVD) technology, the polydimethylsiloxane-coated wood (PDMS@wood) with hydrophobic surface was fabricated employing dichlorodimethylsilane as the CVD chemical resource. The result of water contact angle (i.e., 157.3°) revealed the hydrophobic behavior of the PDMS@wood. The microstructures of the wood samples were observed by scanning electron microscopy and energy dispersive X-ray spectroscopy (EDS) analysis verified PDMS successfully coated on wood surfaces. The chemical functional groups of the PDMS@wood were investigated by Fourier transform infrared (FT-IR) and Raman spectra. The thermogravimetric results indicated the enhanced thermal stability of the wood after PDMS coating. In addition, the stability test of PDMS@wood indicated that the hydrophobicity properties of the PDMS@wood samples were preserved after long-time storage (e.g., 30 days). The scratch test was carried out to examine the abrasion resistance of the hydrophobic coatings on PDMS@wood surface. It was suggested that low-temperature CVD process could be a successful approach for fabricating hydrophobic wood.
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29
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Efficient organic-to-inorganic conversion of polysiloxane by novel platinum-thiol catalytic system. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109161] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Pezzuoli D, Angeli E, Repetto D, Ferrera F, Guida P, Firpo G, Repetto L. Nanofluidic-Based Accumulation of Antigens for Miniaturized Immunoassay. SENSORS 2020; 20:s20061615. [PMID: 32183234 PMCID: PMC7146560 DOI: 10.3390/s20061615] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 01/29/2023]
Abstract
The continuous advances of Nanofluidics have been stimulating the development of novel nanostructures and strategies to accumulate very diluted analytes, for implementing a new class of high sensitivity miniaturized polymeric sensors. We take advantage of the electrokinetic properties of these structures, which allow accumulating analytes inside asymmetric microfluidic structures to implement miniaturized sensors able to detect diluted solutions down to nearly 1.2 pg/mL. In particular, exploiting polydimethylsiloxane devices, fabricated by using the junction gap breakdown technique, we concentrate antigens inside a thin microfunnel functionalized with specific antibodies to favor the interaction and, if it is the case, the recognition between antigens in solution and antibodies anchored to the surface. The transduction mechanism consists in detecting the fluorescence signal of labeled avidin when it binds to biotinylated antigens. Here, we demonstrate that exploiting these electrokinetic phenomena, typical of nanofluidic structures, we succeeded in concentrating biomolecules in correspondence of a 1 pL sensing region, a strategy that grants to the device performance comparable to standard immunoassays.
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Affiliation(s)
- Denise Pezzuoli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Elena Angeli
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
- Correspondence:
| | - Diego Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Francesca Ferrera
- Centre of Excellence for Biomedical Research, University of Genoa, viale Benedetto XV 9, 16132 Genoa, Italy
| | - Patrizia Guida
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Giuseppe Firpo
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
| | - Luca Repetto
- Department of Physics, University of Genoa, via Dodecaneso 33, 16146 Genoa, Italy
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Sousa RPCL, Ferreira B, Azenha M, Costa SPG, Silva CJR, Figueira RB. PDMS Based Hybrid Sol-Gel Materials for Sensing Applications in Alkaline Environments: Synthesis and Characterization. Polymers (Basel) 2020; 12:polym12020371. [PMID: 32046023 PMCID: PMC7077420 DOI: 10.3390/polym12020371] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2019] [Revised: 01/10/2020] [Accepted: 01/16/2020] [Indexed: 01/21/2023] Open
Abstract
Nowadays, concrete degradation is a major problem in the civil engineering field. Concrete carbonation, one of the main sources of structures' degradation, causes concrete's pH to decrease; hence, enabling the necessary conditions for corrosion reinforcement. An accurate, non-destructive sensor able to monitor the pH decrease resistant to concrete conditions is envisaged by many researchers. Optical fibre sensors (OFS) are generally used for concrete applications due to their high sensitivity and resistance to external interferences. Organic-inorganic hybrid (OIH) films, for potential functionalization of OFS to be applied in concrete structures, were developed. Polydimethylsiloxane (PDMS) based sol-gel materials were synthesized by the formation of an amino alcohol precursor followed by hydrolysis and condensation. Different ratios between PDMS and (3-aminopropyl)triethoxysilane (3-APTES) were studied. The synthesized OIH films were characterized by Fourier-transformed infrared spectroscopy (FTIR), UV-Vis spectroscopy, electrochemical impedance spectroscopy (EIS) and thermogravimetric analysis (TGA). The OIH films were doped with phenolphthalein (Phph), a pH indicator, and were characterized by UV-Vis and EIS. FTIR characterization showed that the reaction between both precursors, the hydrolysis and the condensation reactions occurred successfully. UV-Vis characterization confirmed the presence of Phph embedded in the OIH matrices. Dielectric and thermal properties of the materials showed promising properties for application in contact with a high alkaline environment.
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Affiliation(s)
- Rui P. C. L. Sousa
- Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal; (B.F.); (S.P.G.C.); (C.J.R.S.)
- Correspondence: (R.P.C.L.S.); or (R.B.F.)
| | - Bárbara Ferreira
- Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal; (B.F.); (S.P.G.C.); (C.J.R.S.)
| | - Miguel Azenha
- ISISE, Departamento de Engenharia Civil, Escola de Engenharia, Campus de Azurém, Universidade do Minho, 4800-058 Guimarães, Portugal;
| | - Susana P. G. Costa
- Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal; (B.F.); (S.P.G.C.); (C.J.R.S.)
| | - Carlos J. R. Silva
- Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal; (B.F.); (S.P.G.C.); (C.J.R.S.)
| | - Rita B. Figueira
- Centro de Química, Campus de Gualtar, Universidade do Minho, 4710-057 Braga, Portugal; (B.F.); (S.P.G.C.); (C.J.R.S.)
- Correspondence: (R.P.C.L.S.); or (R.B.F.)
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32
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Dong B, Wang F, Abadikhah H, Hao L, Xu X, Khan SA, Wang G, Agathopoulos S. Simple Fabrication of Concrete with Remarkable Self-Cleaning Ability, Robust Superhydrophobicity, Tailored Porosity, and Highly Thermal and Sound Insulation. ACS APPLIED MATERIALS & INTERFACES 2019; 11:42801-42807. [PMID: 31657542 DOI: 10.1021/acsami.9b14929] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Self-cleaning materials have attracted immense commercial and academic interests in recent years. A major challenge is the scalable and cost-effective fabrication of three-dimensional bulk materials with remarkable self-cleaning and a desirable combination of tailored porosity, robust superhydrophobicity, excellent mechanical strength, heat insulation, and sound absorption ability. Here, self-cleaning concrete was achieved in one step through the combination of the liquid template pore formation and in situ bulk hydrophobic modification. The concrete exhibited superhydrophobicity with a high water contact angle of 166° both on the surface and inside of the sample, which qualified the sample with remarkable stain repellency and long-term stability. The water contact angle remained unchanged under continuous mechanical grinding and harsh environments, such as high temperature (450 °C in air and 650 °C in Ar) and chemical erosion. The concrete with a controllable porosity from 56.3 to 77.4% and homogeneous small pore size (∼15 μm) exhibited high compressive strength and low thermal conductivity. Furthermore, high sound absorption capacity (97%, 500 Hz) at a vibration frequency from 400 to 600 Hz was realized. With these excellent performances and characteristics and easy scalable fabrication, the concrete prepared in this work possessed a wide application prospect.
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Affiliation(s)
- Binbin Dong
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Feihong Wang
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Hamidreza Abadikhah
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Luyuan Hao
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Xin Xu
- CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering , University of Science and Technology of China , Hefei , Anhui 230026 , P. R. China
| | - Sayed Ali Khan
- College of Physics and Optoelectronics Engineering Shenzhen University , Nanhai Avenue 3688 , Shenzhen , Guangdong 518060 , P. R. China
| | - Gang Wang
- State Key Laboratory of Advanced Refractories , Sinosteel Luoyang Institute of Refractories Research Company, Limited , Luoyang , Henan 471039 , P. R. China
| | - Simeon Agathopoulos
- Department of Materials Science and Engineering , University of Ioannina , Ioannina GR-451 10 , Greece
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33
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Rattanaumpa T, Naowanon W, Amnuaypanich S, Amnuaypanich S. Polydimethylsiloxane Sponges Incorporated with Mesoporous Silica Nanoparticles (PDMS/H-MSNs) and Their Selective Solvent Absorptions. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b02946] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tidapa Rattanaumpa
- Applied Chemistry Division, Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH−CIC), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Wittawinwit Naowanon
- Materials Chemistry Research Center (MCRC-KKU), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Sujitra Amnuaypanich
- Materials Chemistry Research Center (MCRC-KKU), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
| | - Sittipong Amnuaypanich
- Applied Chemistry Division, Department of Chemistry and Center of Excellence for Innovation in Chemistry (PERCH−CIC), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
- Materials Chemistry Research Center (MCRC-KKU), Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
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34
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Polydimethylsiloxane and poly(ether) ether ketone functionally graded composites for biomedical applications. J Mech Behav Biomed Mater 2019; 93:130-142. [DOI: 10.1016/j.jmbbm.2019.02.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2018] [Revised: 01/26/2019] [Accepted: 02/11/2019] [Indexed: 11/18/2022]
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35
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Strategies for Fabrication of Hydrophobic Porous Materials Based on Polydimethylsiloxane for Oil-Water Separation. Macromol Res 2019. [DOI: 10.1007/s13233-019-7083-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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36
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Preparation and Behavior of Bamboo Fiber-Reinforced Polydimethylsiloxane Composite Foams during Compression. FIBERS 2018. [DOI: 10.3390/fib6040091] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
This study investigates the mechanical properties of bamboo fiber-reinforced polydimethylsiloxane (BF-PDMS) foams with up to 3.4% (by mass) fiber during compression. Pristine PDMS foams and BF-PDMS composite foams were fabricated using a sugar leaching method. Compression test results of pristine PDMS and BF-PDMS composite foams display plateau and densification regions. Predictions of a modified phenomenological foam (PF) model based on Maxwell and Kelvin–Voight models are in good agreement with compression test results. Stiffness coefficients were extracted by fitting results of compression tests to the modified PF model. Spring and densification coefficients of BF-PDMS composite foams are 2.5- and 15-fold greater than those of pristine PDMS foams, respectively. Strains corresponding to onset of densification computed using extracted coefficients were 35% and 25% for pristine PDMS foams and BF-PDMS composite foams, respectively. Compressing foams at 6.0 and 0.5 mm/min results in highest and lowest compressive stress, respectively. Insights from this study are useful in many areas such as environmental protection, pressure sensing, and energy where PDMS composite foams will find applications.
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37
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Chen C, Bu X, Feng Q, Li D. Cellulose Nanofiber/Carbon Nanotube Conductive Nano-Network as a Reinforcement Template for Polydimethylsiloxane Nanocomposite. Polymers (Basel) 2018; 10:E1000. [PMID: 30960925 PMCID: PMC6403898 DOI: 10.3390/polym10091000] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2018] [Revised: 08/31/2018] [Accepted: 09/04/2018] [Indexed: 11/21/2022] Open
Abstract
Both cellulose nanofiber (CNF) and carbon nanotube (CNT) are nanoscale fibers that have shown reinforcing effects in polymer composites. It's worth noting that CNF and CNT could form a three-dimensional nano-network via mixing and vacuum filtration, which exhibit excellent mechanical strength and electrical conductivity. In this study, the developed CNF/CNT film was applied as a nano-network template and immersed into polydimethylsiloxane (PDMS) solutions. By controlling the immersed polydimethylsiloxane pre-polymer concentration, the PDMS/CNF/CNT nanocomposite with various PDMS contents were fabricated after a curing process. Morphological images showed that the CNF/CNT nano-network was well-preserved inside the PDMS, which resulted in significantly improved mechanical strength. While increasing the PDMS content (~71.3 wt %) gave rise to decreased tensile strength, the PDMS-30/CNF/CNT showed a fracture strain of 7.5%, which was around seven fold higher than the rigid CNF/CNT and still kept a desirable strength-Young's modulus and conductivity of 18.3 MPa, 805 MPa, and 0.8 S/cm, respectively. Therefore, with the enhanced mechanical properties and the electrical conductivity, the prepared PDMS/CNF/CNT composite films may offer promising and broad prospects in the field of flexible devices.
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Affiliation(s)
- Chuchu Chen
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Xiangting Bu
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Qian Feng
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
| | - Dagang Li
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
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