CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Yuqin Wan,Ning Qin,Yifan Wang,Qingbai Zhao,Qiang Wang,Pengcheng Yuan,Qiang Wen,Hao Wei,Xinyue Zhang,Ning Ma
Porous conductive polyurethane (PU) sponges were prepared by combining a sugar-templated fabrication of porous polyurethane elastomer and the in-situ polymerization of pyrrole inside the sponges. The conductive sponges had a uniform porous structure similar to the sugar cube templates and a unique micro-wrinkled structure of polypyrrole (PPy). Moreover, the conductive sponges exhibited good mechanical properties and electrical conductivity by the combination of elastomeric PU and conductive PPy , which make the conductive PPy-PU sponges as good candidates for pressure and strain sensitive materials. It was shown that a single PPy-PU conductive sponge was not only sensitive to large forces, but also sensitive to the tiny deformation by small forces such as 0.1 N, thus realizing a wide-range detection of pressure forces from 0.1 N to 200 N. Furthermore, the detection range could be further enlarged to more than 800 N by assembling a sponge array. A PPy-PU sponge matrix was also designed and showed potential application in multi-site position detection. These sugar-templated conductive sponges may find application for sensors in human physiological movement and intelligent monitoring.
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2024
·Vol. 141
·期 27
·e55612
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IF 2.7
Yifan Wang,Zhiqiang Yu
In this work, a technique for constructing a three-dimensional (3D) skeleton of hexagonal boron nitride (h-BN) using sugar as the fulcrum and preparing composites by embedding in the epoxy (EP) in a vacuum environment is proposed. The study of thermal conductivity (TC) in polymer composites is conducted through a blend of techniques: laser flashing, theoretical modeling, and finite element simulation. The h-BN skeleton exhibits a honeycomb structure through the scanning electron microscopy findings. Further investigation using finite element simulation demonstrates that conductive networks are formed by the h-BN skeleton within the composites, leading to a notable enhancement in TC. Specifically, the composite for h-BN/EP reaches a TC of 2.25 W/m K when composed of 52 vol% h-BN. A dielectric loss of 0.008 for the composite with the same h-BN loading shows a considerable improvement. The compressive yield strength of the 3D h-BN/EP composites reached 312 MPa at 5 vol% h-BN loading.
研究领域:
材料科学
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热传导工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
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IF 6.216
Shunli Liu,Mengmeng Kang,Kewen Li,Fang Yao,Olayinka Oderinde,Guodong Fu,Liqun Xu
Self-healing hydrogels possess the capability to repair themselves after mechanical damage, but their applications are often severely limited by their weak mechanical strengths or poor healing efficiencies. To obtain the self-healing hydrogels with high performances, a linear polysaccharide template with aldehyde groups was introduced in the gelation process. The polysaccharide template (oxidized sodium alginate, OSA) can conjugate with acrylamide (AM) monomer via Schiff base reaction. The radical polymerization between double bonds in the side chains of OSA and free AM monomer results in the formation of OSA-poly(acrylamide) (OSA-PAM) hydrogels. The synergistic effect of dynamic Schiff base and hydrogen bonding interactions between OSA and PAM chains endows the OSA-PAM hydrogels with excellent self-healing and mechanical properties. The resulting OSA-PAM hydrogels also exhibit controllable conductivity and stretch sensitivity. The self-healing, mechanically tough and conductive OSA-PAM hydrogels could have potential applications in artificial skins, robotic actuators and medical devices.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Shasha Li,Liangzhi Qiao,Jiahong Hu,Jiawei Zhang,Zhangyong Tang,Kaifeng Du
The conflict between macroporous structure and high specific surface area strongly limited the dynamic adsorption performance of chromatographic media. Here, macroporous and high-specific-surface-area cellulose microspheres (PCMs) are prepared by using semi-dissolved chitosan as a dual-functional template and subsequently functionalized with diethylaminoethyl (DEAE) as anion exchangers for protein separation. The dual-functional template strategy leverages dissolved chitosan nanofibers as meso/micropore templates and the undissolved chitosan particles as macropore templates. The macropores of DEAE-PCMs (average size: 0.4–1.2 μm) efficiently decrease mass transfer resistance for fast uptake kinetics. The high specific surface area (272.34 m 2 /g) provides sufficient ligand sites for ensuring exceptional adsorption capacities. Therefore, the chitosan bifunctional templated PCMs, possessing a macro/meso/microporous structure, are promising candidates for high-performance chromatographic media.
研究领域:
生物技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Inorganics
·
2022
·Vol. 10
·期 7
·87
·
IF 3.149
Xiaoqi Jin,Jinlong Ge,Liyuan Zhang,Zhong Wu,Linlin Zhu,Mingwen Xiong
Hierarchically ordered porous silica materials (HSMs) with a micro/mesoporous structure were successfully prepared with the sol-gel method using dextran, dextran/CTAB, and CTAB as templates. The obtained hierarchically structured silica was successfully modified with amine groups through post-grafting and one-pot methods. Their architectural features and texture parameters were characterized by XRD, N2adsorption–desorption isotherms, SEM, TEM, FTIR, and TGA techniques. The results demonstrated that the pore structure depended on the reaction temperature and the amount of CTAB added in the synthesis procedure. A series of porous silica with hierarchical pore structures possessed abundant micropores, ordered mesopores, and a tunable surface area and pore volume. After modification, the ordered structure of the hierarchical porous silica almost disappeared due to the presence of amine groups in the pore channel. Furthermore, to explore the effect of pore structures and amine groups on CO2adsorption performance, before and after amine modification of HSMs, adsorbents were evaluated regarding the capacity of collecting CO2for comparison. According to these results, the varying microporous content, pore size distribution, and density of the amine groups were important factors determining the capacity of CO2capture.Keywords:hierarchically ordered porous silica;dextran template;amine group modification;CO2capture
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Caixia Cui,Hong Ming,Linjing Li,Mingjie Li,Jian Gao,Tao Han,Yunyun Wang
We report here adopting a glucose template for synthesizing mesoporous silica for enzyme in-situ immobilization. Bifunctional GSH synthetase (GSHF) and polyphosphate kinase (PPK) were selected as model system for synthesizing GSH with ATP regeneration. Results indicated that a pore size that was slightly smaller than that of enzyme was responsible for the high performance of immobilized enzyme inside mesoporous without protein leaking. Then, the cationic dopamine was used for PPK immobilization by self-polymerization. The co-immobilized enzyme activity was much higher than that of the free enzyme. The catalytic efficiency kcat/Km of co-immobilized enzyme was higher than that of the free enzyme (8.5 and 1.5 times higher for GSHF and PPK, respectively). After optimizing the reaction parameters, the co-immobilized enzymes exhibited excellent operational and storage stability, and could be re-used seven times and retained the original activity after 30 days. It is hoped that these findings will pave the way for applying enzyme co-immobilization to biocatalytic system.
研究领域:
生物化学
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生物技术
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）