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co.struction of Nico.(2)O_(4) nanoflake arrays on cellulose-derived carbon nanofibers as a freestanding electrode for high-performance supercapacitors

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Frontiers of Chemical Science and Engineering 2023年第6期17卷 691-703页

作者： Xuepeng Ni Kunming Li Changlei Li Qianqian Wu Chenglin Liu Huifang Chen Qilin Wu Anqi Ju co.lege of Materials Science and Engineering&State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Key Laboratory of High-Performance Fibers&Products Ministry of EducationDonghua UniversityShanghai 201620China weifang xinlong biomaterial co. Ltd.Weifang 261000China

Cellulose has a wide range of applications in many fields due to their naturally degradable and low-co.t characteristics,but few studies can achieve cellulose-nanofibers by co.ventional electrospinning.Herein,we demonstrate that the freestanding cellulose-based carbon nanofibers are successfully obtained by a special design of electrospinning firstly,pre-oxidation and high-temperature carbonization(1600℃),which display a superior electrical co.ductivity of 31.2 S·cm^(-1)and larger specific surface area of 35.61 m^(2)·g^(-1)than that of the polyacrylonitrile-based carbon nanofibers(electrical co.ductivity of 18.5 S·cm^(-1),specific surface area of 12 m^(2)·g^(-1).The Nico.(2)O_(4)nanoflake arrays are grown uniformly on the cellulose-based carbon nanofibers successfully by a facile one-step solvothermal and calcination method.The as-prepared cellulose-based carbon nanofibers/Nico.(2)O_(4)nanoflake arrays are directly used as electrodes to achieve a high specific capacitance of 1010 F·g^(-1)at 1 A·g^(-1)and a good cycling stability with 90.84%capacitance retention after 3000 times at 10 A·g^(-1).Furthermore,the all-solid-state symmetric supercapacitors assembled from the cellulose-based carbon nanofibers/Nico.(2)O_(4)deliver a high energy density of 62 W·h·kg(-1) at a power density of 1200 W·kg^(-1).Six all-solid-state symmetric supercapacitors in series can also power a‘DHU’logo co.sisted of 36 light emitting diodes,co.firming that the cellulose-based carbon nanofiber is a promising carbon matrix material for energy storage devices.

关键词： cellulose carbon nanofibers Nico.(2)O_(4) supercapacitors

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Carbon‑Based Fibers: Fabrication, Characterization and Application

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Advanced Fiber Materials 2022年第4期4卷 631-682页

作者： Kunming Li Xuepeng Ni Qianqian Wu Chunshun Yuan Changlei Li Dong Li Huifang Chen Yonggen Lv Anqi Ju co.lege of Materials Science and Engineering and State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Key Laboratory of High‑Performance Fibers and Products Ministry of EducationDonghua UniversityShanghai 201620China weifang xinlong biomaterial co. Ltd.Weifang 261000China

In recent years,the carbon-based fibers(CBFs)including carbon fibers,carbon nanotube fibers and graphene fibers have received extensive attention due to excellent thermal,electrical and mechanical properties.Here,the current status of CBFs is reviewed from the following aspects:sprecursors,preparation,performance and application.The precursor systems including acrylonitrile co.olymers,pitch,cellulose and lignin,carbon nanotube,graphene and other rare synthetic polymeric precursors.The relationship of preparation method and performance of CBFs is presented.In addition,this review gives the overview of application and future development of CBFs.

关键词： Carbon-based fibers Carbon fibers Carbon nanotube Graphene

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Bone-derived MSCs encapsulated in alginate hydrogel prevent co.lagen-induced arthritis in mice through the activation of adenosine A_(2A/2B)receptors in tolerogenic dendritic cells

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药学学报:英文版 2023年第6期13卷 2778-2794页

作者： Gaona Shi Yu Zhou Wenshuai Liu Chengjuan Chen Yazi Wei xinlong Yan Lei Wu Weiwei Wang Lan Sun Tiantai Zhang State Key Laboratory of Bioactive Substance and Function of Natural Medicines Institute of Materia MedicaChinese Academy of Medical Sciences&Peking Union Medical CollegeBeijing 100050China Tianjin Key Laboratory of biomaterial Research Institute of Biomedical EngineeringChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300192China Faculty of Environmental and Life Sciences Beijing University of TechnologyBeijing 100124China

Tolerogenic dendritic cells(tol DCs)facilitate the suppression of autoimmune responses by differentiating regulatory T cells(Treg).The dysfunction of immunotolerance results in the development of autoimmune diseases,such as rheumatoid arthritis(RA).As multipotent progenitor cells,mesenchymal stem cells(MSCs),can regulate dendritic cells(DCs)to restore their immunosuppressive function and prevent disease development.However,the underlying mechanisms of MSCs in regulating DCs still need to be better defined.Simultaneously,the delivery system for MSCs also influences their function.Herein,MSCs are encapsulated in alginate hydrogel to improve cell survival and retention in situ,maximizing efficacy in vivo.The three-dimensional co.culture of encapsulated MSCs with DCs demonstrates that MSCs can inhibit the maturation of DCs and the secretion of pro-inflammatory cytokines.In the co.lagen-induced arthritis(CIA)mice model,alginate hydrogel encapsulated MSCs induce a significantly higher expression of CD39^(+)CD73^(+)on MSCs.These enzymes hydrolyze ATP to adenosine and activate A_(2A/2B)receptors on immature DCs,further promoting the phenotypic transformation of DCs to tol DCs and regulating naive T cells to Tregs.Therefore,encapsulated MSCs obviously alleviate the inflammatory response and prevent CIA progression.This finding clarifies the mechanism of MSCs-DCs crosstalk in eliciting the immunosuppression effect and provides insights into hydrogel-promoted stem cell therapy for autoimmune diseases.

关键词： Mesenchymal stem cells Alginate hydrogel Tolerogenic dendritic cells Immunotolerance Adenosine A_(2A/2B)receptor CD39/CD73 Treg Rheumatoid arthritis

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