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Electrospinning organic solvent resistant preoxidized poly(acrylonitrile)nanofiber membrane and its properties

Chinese Journal of Chemical Engineering 2023年第1期53卷 289-299页

作者： Zhiwei Du Jinxue Cheng Qinglin Huang Mingxing Chen Changfa Xiao State Key Laboratory of Separation membranes and membrane Processes/National Center for International Joint Research on Separation membranes Tianjin 300387China Department of Material Science and Engineering Tiangong UniversityTianjin 300387China College of Textile and Garments Hebei University of Science and TechnologyShijiazhuang 050018China Fiber Materials Research Center Shanghai University of Engineering ScienceShanghai 201620China

A high performance preoxidized poly(acrylonitrile)(O-PAN)nanofiber membrane with excellent solvent resistance,thermal stability and flexibility was fabricated by the preoxidation of electrospun PAN nanofiber *** performance of resultant O-PAN nanofiber membrane was optimized by altering the PAN concentration and preoxidation *** results showed that the O-PAN nanofiber membrane which made from PAN concentration of 14%(mass)and preoxidation temperature of 250.0℃ have a more optimal comprehensive *** the long-term separation test of SiO2 particle(1 μm)in DMAc suspension,the permeate flux of O-PAN nanofiber membrane stabilized at 227.91 L·m^(-2)·h^(-1)(25℃,0.05 MPa)while the SiO2 rejection above 99.6%,which showed excellent solvent resistance and separation *** order to further explore the application of the O-PAN nanofiber membrane,the OPAN nanofiber membrane was treated with fluoride and used in oil/water separation *** O-PAN nanofiber membrane after hydrophobic treatment showed excellent hydrophobicity and good oil/water separation performance with the permeate flux about 969.59 L·m^(-2)·h^(-1)while the separation efficiency above 96.1%.The O-PAN nanofiber membrane exhibited a potential application prospect in harsh environment separation.

关键词： Poly(acrylonitrile)(PAN) Preoxidation nanofiber membrane Solvent resistance Oil/water separation

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Fabrication of magnetically responsive anti-fouling and easy-cleaning nanofiber membrane and its application for efficient oil-water emulsion separation

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Chinese Journal of Chemical Engineering 2022年第1期35卷 286-293页

作者： Yajie Wang Zhiwei Guo Yujie Yang Yanxiang Li Qingchun Guo Peilin Cui Wangliang Li CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Hebei Lansheng Biotech Co. LtdShijiazhuang 052200China International Medical Service Beijing Tiantan Hospital Affiliated to Capital Medical UniversityChina

The magnetically responsive anti-fouling nanofiber membrane(MRANM)was fabricated for efficient oilwater emulsion separation,which could be cleaned using oscillating magnetic *** was prepared by grafting superparamagnetic Fe_(3)O_(4) nanoparticles onto the surface of electrospun polyacrylonitrile nanofiber membrane(PANM).Compared with PANM,the water contact angle of MRANM decreased from 104°to 0°,indicating that the hydrophilicity of the membrane was significantly *** the emulsions of hexadecane,octane and rapeseed oil,the separation efficiency was 98.04%,96.59%and 92.67%,*** the treatments in oscillating magnetic field,the separation efficiency kept above 95%after 8 times recycling,which indicated that the MRANM had good regenerability and *** as-fabricated membrane with magnetic responsiveness facilitated an effective method for solving the membrane fouling problem during practical applications of separation high viscosity oil-water emulsion.

关键词： Superparamagnetic nanofiber membrane Anti-fouling Oil-water emulsion Regeneration

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Sustained release of vascular endothelial growth factor A and basic fibroblast growth factor from nanofiber membranes reduces oxygen/glucose deprivation-induced injury to neurovascular units

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Neural Regeneration Research 2024年第4期19卷 887-894页

作者： Yifang Wu Jun Sun Qi Lin Dapeng Wang Jian Hai Department of Neurosurgery Tongji HospitalSchool of MedicineTongji University Department of Pharmacy Institute of Medical SciencesShanghai Jiao Tong University School of Medicine

Upregulation of vascular endothelial growth factor A/basic fibroblast growth factor(VEGFA/b FGF)expression in the penumbra of cerebral ischemia can increase vascular volume,reduce lesion volume,and enhance neural cell proliferation and differentiation,thereby exerting neuroprotective ***,the beneficial effects of endogenous VEGFA/b FGF are limited as their expression is only transiently *** this study,we generated multilayered nanofiber membranes loaded with VEGFA/b FGF using layer-by-layer self-assembly and electrospinning *** found that a membrane containing 10 layers had an ideal ultrastructure and could efficiently and stably release growth factors for more than 1 *** 10-layered nanofiber membrane promoted brain microvascular endothelial cell tube formation and proliferation,inhibited neuronal apoptosis,upregulated the expression of tight junction proteins,and improved the viability of various cellular components of neurovascular units under conditions of oxygen/glucose ***,this nanofiber membrane decreased the expression of Janus kinase-2/signal transducer and activator of transcription-3(JAK2/STAT3),Bax/Bcl-2,and cleaved ***,this nanofiber membrane exhibits a neuroprotective effect on oxygen/glucose-deprived neurovascular units by inhibiting the JAK2/STAT3 pathway.

关键词： brain ischemia brain microvascular endothelial cell nanofiber membrane neurovascular unit

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IMPROVING HYDROPHILICITY AND PROTEIN ANTIFOULING OF ELECTROSPUN POLY(VINYLIDENEFLUORIDE-HEXAFLUOROPROPYLENE) nanofiber membraneS

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Chinese Journal of Polymer Science 2010年第5期28卷 705-713页

作者：李新松 Biomaterials and Drug Delivery Laboratories School of Chemistry and Chemical EngineeringSoutheast University

Poly（vinylidenefluoride-hexafluoropropylene）（PVDF-HFP） nanofiber membranes with improved hydrophilicity and protein fouling resistance via surface graft copolymerization of hydrophilic monomers were prepared. The surface modification involves atmospheric pressure glow discharge plasma （APGDP） pretreatment followed by graft copolymerization of poly（ethylene glycol） methyl ether methacrylate （PEGMA）. The success of the graft modification with PEGMA on the PVDF-HFP fibrous membrane is ascertained by X-ray photoelectron spectroscopy （XPS） and attenuated total reflectance Fourier transform infrared measurements （ATR-FTIR）. The hydrophilic property of the nanofiber membranes is assessed by water contact angle measurements. The results show that the PEGMA grafted PVDF-HFP nanofiber membrane has a water contact angle of 0° compared with the pristine value of 132°. The protein adsorption was effectively reduced after PEGMA grafting on the PVDF-HFP nanofiber membrane surface. The PEGMA polymer grafting density on the PVDF-HFP membrane surface is measured by the gravimetric method, and the filtration performance is characterized by the measurement of water flux. The results indicate that the water flux of the grafted PVDF-HFP fibrous membrane increases significantly with the increase of the PEGMA grafting density.

关键词： Poly(vinylidenefluoride-hexafluoropropylene) nanofiber membrane Graft polymerization Hydrophilic property Protein fouling resistance.

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Ultra-sensitive and wide applicable strain sensor enabled by carbon nanofibers with dual alignment for human machine interfaces

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Nano Research 2023年第3期16卷 4093-4099页

作者： Peng Bi Mingchao Zhang Shuo Li Haojie Lu Haomin Wang Xiaoping Liang Huarun Liang Yingying Zhang Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education Department of ChemistryTsinghua UniversityBeijing 100084China Laboratory of Flexible Electronics Technology Tsinghua UniversityBeijing 100084China

Flexible strain sensors with high sensitivity,wide detection range,and low detection limit have continuously attracted great interest due to their tremendous application potential in areas such as health/medical-care,human-machine interface,as well as safety and *** both of a high sensitivity and a wide working range are desired key parameters for a strain sensor,they are usually contrary to each other to be achieved on the same sensor due to the tightly structure dependence of both of ***,a flexible strain sensor with both high sensitivity and wide strain detection range is prepared based on the design of an integrated membrane containing both of parallel aligned and randomly aligned carbon nanofibers(CNFs).The parallel aligned CNF membrane(p-CNF)exhibits a low strain detection limit and high sensitivity,while the random aligned CNF membrane(r-CNF)exhibits a large strain detection *** the advantages of both p-CNF and r-CNF,the strain sensor with stacked p-CNF and r-CNF(p/r-CNF)exhibits both high sensitivity and wide working *** gauge factor(GF)is 1,272 for strains under 0.5%and 2,266 for strain from 70%to 100%.At the same time,it can work in a wide strain range of 0.005%to 100%,fulfilling the requirements for accurately detecting full-range human *** demonstrated its applications in the recognition of facial expressions and joint ***,we constructed an intelligent lip-language recognition system,which can accurately track phonetic symbols and may help people with language disabilities,proving the potential of this strain sensor in health management and medical ***,we foresee that the dual-alignment structure design of the p/r-CNF strain sensor may also be applied in the design of other high performance sensors.

关键词： nanofiber membrane carbon nanofibers flexible sensor dual-alignment high sensitivity

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Self-powered nanofiber-based screen-print triboelectric sensors for respiratory monitoring

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Nano Research 2018年第7期11卷 3771-3779页

作者： Ran Cao diaona Wang Shuyu Zhao Wei Yang Zuqing Yuan Yingying Yin Xinyu Du Nian-Wu Li Xiuling Zhang Xiuyan Li Zhong Lin Wang Congju Li Beijing Institute of Nanoenergy and Nonosystems Chinese Academy of Sciences National Center for Nanoscience and Technology (NCNST) Beijing 100083 China School of Materials Science & Engineering Beijing Institute of Fashion Technology Beijing 100029 China School of Material Science and Engineering Georgia Institute of Technology Atlanta Georgia 30332-0245 USA

Scientific and commercial advances have set high requirements for wearable electronics. However, the power supply, breathability, and mass production of wearable electronics still have many challenges that need to be overcome. In this study, a self-powered nanofiber-based triboelectric sensor （SNTS） was fabricated by batch-scale fabrication technologies using electrospinning and screen-printing for health monitoring via respiratory monitoring. Typically, an arch structural SNTS is assembled by a nanofiber membrane and a Ag nanoparticle electrode. The pile of nanofibers and the conductive network of Ag nanoparticles ensure a gas channel across the whole device. The gas permeability of the SNTS was as high as 6.16 mm/s, which has overwhelming advantages when compared with commonly used wearable devices composed of air-tight cast films. Due to the softness of the nanofiber membrane, the SNTS showed excellent electronic output performance irrespective of whether it was bent, twisted, or folded. The superior properties, such as breathability, skin-friendliness, self-power, and batch fabrication of SNTS offer huge potential for their application in healthcare monitoring and multifunctional intelligent systems.

关键词： self-powered nanofiber membrane air-permissive triboelectric sensor screen-print health monitoring

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壳聚糖季铵盐纳米纤维膜的制备及其对铜离子吸附性能研究

壳聚糖季铵盐纳米纤维膜的制备及其对铜离子吸附性能研究

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2014年全国高分子材料科学与工程研讨会

作者：陈少华徐长安刘源森郭飞王桦武汉纺织大学材料科学与工程学院国家海洋局海洋生物资源综合利用工程技术研究中心

壳聚糖是甲壳素脱乙酰化而得到的生物多糖,具有来源丰富、生物降解和生物活性等优点。壳聚糖分子中含有大量的氨基和羟基,可以与重金属离子形成螯合物。利用壳聚糖的该特性,可对含重金属离子的污水进行吸附处理,实现污水净化。制备高吸... 详细信息

壳聚糖是甲壳素脱乙酰化而得到的生物多糖,具有来源丰富、生物降解和生物活性等优点。壳聚糖分子中含有大量的氨基和羟基,可以与重金属离子形成螯合物。利用壳聚糖的该特性,可对含重金属离子的污水进行吸附处理,实现污水净化。制备高吸附率的壳聚糖吸附材料,需较大比表面积。本文采用静电纺丝法制备壳聚糖纳米纤维膜,该类纳米纤维膜的比表面积范围大致为40-100m/g,具有较大的比表面积。

关键词： chitosan quaternary ammonium salt nanofiber membrane adsorption property electrospinning

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