The Experts below are selected from a list of 2004 Experts worldwide ranked by ideXlab platform
He Wang - One of the best experts on this subject based on the ideXlab platform.
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micro meso porous structured carbon nanofibers with ultra high surface area and large supercapacitor electrode capacitance
Journal of Power Sources, 2021Co-Authors: Hongxia Wang, He Wang, Haitao Niu, Hongjie Wang, Wenyu Wang, Xin Jin, Hua ZhouAbstract:Abstract Carbon nanofibers from electrospun polymer nanofibers have received considerable attention. However, most of the carbon nanofibers with a surface area above 1000 m2/g were reported to have a supercapacitor electrode capacitance far below 350 F g−1. Herein, we report a novel carbon Nanofibrous Material that has a supercapacitor electrode capacitance as high as 394 F g−1 (1.0 A g−1). We used a polymer blend of polyacrylonitrile (PAN) and novolac (NOC) as Materials, to electrospin them into precursor nanofibers and subsequently carbonize the nanofibers into carbon nanofibers. The carbon nanofibers prepared had a specific surface area as high as 1468 m2 g−1 with a meso-micro pores (average pore size 2.2 nm) predominated porous structure. The carbon nanofiber electrodes after 10,000 cycles of charging and discharging at 1.0 A g−1 maintained the capacitance almost unchanged. At the optimal condition, the supercapacitor device made of the electrodes had an energy density as high as 13.6 Wh∙kg−1 (at 0.5 kW kg−1). The high capacitance value comes from the carbon nanofibers with a large surface area and a unique porous structure. The high inter-fiber interconnection contributes to high capacitance. This super-high surface area carbon may be useful for the development of high-performance supercapacitors and other energy devices.
Pedro Fardim - One of the best experts on this subject based on the ideXlab platform.
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fabrication of biohybrid cellulose acetate collagen bilayer matrices as Nanofibrous spongy dressing Material for wound healing application
Biomacromolecules, 2020Co-Authors: Giriprasath Ramanathan, Liji Sobhana Seleenmary Sobhanadhas, Grace Felciya Sekar Jeyakumar, Vimala Devi, Uma Tiruchirapalli Sivagnanam, Pedro FardimAbstract:Tissue engineering is currently one the fastest growing engineering fields, requiring fabrication of advanced and multifunctional Materials to be used as scaffolds or dressing for tissue regeneration. In this work, a bilayer matrix was fabricated by electrospinning of a hybrid cellulose acetate nanofibers (CA) containing bioactive latex or Ciprofloxacin over highly interconnected collagen (CSPG) 3D matrix previously obtained by a freeze-drying process. The bilayer matrix was fabricated with a Nanofibrous part as the primary (top) layer and a spongy porous part as the secondary (bottom) layer by combining electrospinning and freeze-drying techniques to enhance the synergistic effect of both Materials corresponding to physical and biological properties. The final Material was physicochemically characterized using Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). The bilayer matrix exhibited Nanofibrous and 3D porous structure with properties such as high porosity, swelling, and stability required for soft-tissue-engineering applications. Furthermore, the in vitro biological and fluorescence properties of the matrix were tested against NIH 3T3 fibroblast and human keratinocyte (HaCaT) cell lines and showed good cell adhesion and proliferation over the bilayer matrix. Thus, the synergistic combination of Nanofibrous Material deposition onto to the collagenous porous Material has proved efficient in the fabrication of a bilayer matrix for skin-tissue-engineering applications.
Jianguo Huang - One of the best experts on this subject based on the ideXlab platform.
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Hierarchical, titania-coated, carbon Nanofibrous Material derived from a natural cellulosic substance
Chemistry - A European Journal, 2010Co-Authors: Xiaoyan Liu, Yuanqing Gu, Jianguo HuangAbstract:Hierarchical, titania-coated, Nanofibrous, carbon hybrid Materials were fabricated by employing natural cellulosic substances (commercial filter paper) as a scaffold and carbon precursor. Ultrathin titania films were firstly deposited by means of a surface sol-gel process to coat each nanofiber in the filter paper, and successive calcination treatment under nitrogen atmosphere yielded the titania-carbon composite possessing the hierarchical morphologies and structures of the initial paper. The ultrathin titania coating hindered the coalescence effect of the carbon species that formed during the carbonization process of cellulose, and the original cellulose nanofibers were converted into porous carbon nanofibers (diameters from tens to hundreds of nanometers, with 3-6 nm pores) that were coated with uniform anatase titania thin films (thickness approximately 12 nm, composed of anatase nanocrystals with sizes of approximately 4.5 nm). This titania-coated, Nanofibrous, carbon Material possesses a specific surface area of 404 m(2) g(-1), which is two orders of magnitude higher than the titania-cellulose hybrid prepared by atomic layer deposition of titania on the cellulose fibers of filter paper. The photocatalytic activity of the titania-carbon composite was evaluated by the improved photodegradation efficiency of different dyes in aqueous solutions under high-pressure, fluorescent mercury-lamp irradiation, as well as the effective photoreduction performance of silver cations to silver nanoparticles with ultraviolet irradiation.
Hua Zhou - One of the best experts on this subject based on the ideXlab platform.
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micro meso porous structured carbon nanofibers with ultra high surface area and large supercapacitor electrode capacitance
Journal of Power Sources, 2021Co-Authors: Hongxia Wang, He Wang, Haitao Niu, Hongjie Wang, Wenyu Wang, Xin Jin, Hua ZhouAbstract:Abstract Carbon nanofibers from electrospun polymer nanofibers have received considerable attention. However, most of the carbon nanofibers with a surface area above 1000 m2/g were reported to have a supercapacitor electrode capacitance far below 350 F g−1. Herein, we report a novel carbon Nanofibrous Material that has a supercapacitor electrode capacitance as high as 394 F g−1 (1.0 A g−1). We used a polymer blend of polyacrylonitrile (PAN) and novolac (NOC) as Materials, to electrospin them into precursor nanofibers and subsequently carbonize the nanofibers into carbon nanofibers. The carbon nanofibers prepared had a specific surface area as high as 1468 m2 g−1 with a meso-micro pores (average pore size 2.2 nm) predominated porous structure. The carbon nanofiber electrodes after 10,000 cycles of charging and discharging at 1.0 A g−1 maintained the capacitance almost unchanged. At the optimal condition, the supercapacitor device made of the electrodes had an energy density as high as 13.6 Wh∙kg−1 (at 0.5 kW kg−1). The high capacitance value comes from the carbon nanofibers with a large surface area and a unique porous structure. The high inter-fiber interconnection contributes to high capacitance. This super-high surface area carbon may be useful for the development of high-performance supercapacitors and other energy devices.
Huaping Wang - One of the best experts on this subject based on the ideXlab platform.
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bacterial cellulose based biomimetic Nanofibrous scaffold with muscle cells for hollow organ tissue engineering
ACS Biomaterials Science & Engineering, 2016Co-Authors: Jingxuan Yang, Chao Feng, Shiyan Chen, Minkai Xie, Jianwen Huang, Huaping WangAbstract:In this study, we built a bilayer Nanofibrous Material by utilizing the gelatinization properties of potato starch (PS) to interrupt bacterial cellulose (BC) assembly during static culture to create more free spaces within the fibrous network. Then, muscle cells were cultured on the loose surface of the BC/PS scaffolds to build bioMaterials for hollow organ reconstruction. Our results showed that the BC/PS scaffolds exhibited similar mechanical characters to those in the traditional BC scaffolds. And the pore sizes and porosities of BC/PS scaffolds could be controlled by adjusting the starch content. The average nanofiber diameters of unmodified BC and BC/PS composites is approximately to that of the urethral acellular matrix. Those scaffolds permit the muscle cells infiltration into the loose layer and the BC/PS membranes with muscle cells could enhance wound healing in vivo and vitro. Our study suggested that the use of bilayer BC/PS Nanofibrous scaffolds may lead to improved vessel formation. BC/PS nan...
