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Science China(Technological Sciences) 2022年第2期65卷 481-489页

作者： LEI SaiLing WANG LiMing WANG RongWu qin xiaohong YU JianYong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Electrospun nanofibers are regarded as a promising candidate for filtration because of their prominent size *** precise control of nanofiber diameter is the key to the material’s outstanding filtration capability,but it remains a ***,an electrohydrodynamic scaling model is established for the accurate prediction of fiber diameter based on the velocity of the whipping *** this model,the velocity reflects jet stretching and is tuned by adding *** theoretical predictions agree well with the experimental *** the proposed diameter model,the filtration property of the membrane is significantly optimized by governing the fiber *** the nanofiber is slenderized to 183 nm,an ultralight (0.521 g m;) membrane exhibits high filtration efficiency (99.93%) and low pressure drop (105.2 Pa) against ultrafine aerosol particles (≤0.26μm) under an airflow face velocity of 5.33 cm s^(-1).These findings demonstrate that the established surface charge-based diameter model provides an excellent platform to timely and accurately control the nanofiber diameter via the velocity of whipping jets for highefficiency air filtration.

关键词： electrospinning jet velocity fiber diameter filtration

A Rapid-Ab/Desorption and Portable Photothermal MIL- 101(Cr) Nanofibrous Composite Membrane Fabricated by Spray-Electrospinning for Atmosphere Water Harvesting

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Energy & Environmental Materials 2023年第1期6卷 111-118页

作者： Ailin Li Jian Xiong Ye Liu Liming Wang xiaohong qin Jianyong Yu Key Laboratory of Textile Science and Technology of Ministry of Education College of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

MIL-101(Cr)is a promising moisture absorbent for solar-driven water harvesting from moisture to tackle the worldwide water shortage ***,the MIL-101(Cr)powder suffers from a long ab/desorption cycle due to the crystal aggregation caused by its inherent powder ***,we demonstrate a MIL-101(Cr)nanofibrous composite membrane with a nanofibrous matrix where MIL-101(Cr)is monodisperse in the 3D porous nanofibrous matrix through a simple spray-electrospinning *** continuous porous nanofibrous matrix not only offers sufficient sites for MIL-101(Cr)loading but also provides rapid moisture transport channels,resulting in a super-rapid ab/desorption duration of 50 min(including an absorption process for 40 min and a desorption process for 10 min)and multicycle daily water production of 15.9 L kg^(−1) d^(−1).Besides,the MIL-101(Cr)nanofibrous composite membrane establishes a high solar absorption of 92.8%,and excellent photothermal conversion with the surface temperature of 70.7°C under one-sun *** addition,the MIL-101(Cr)nanofibrous composite membrane shows excellent potential for practical application due to its flexibility,portability,and use *** work provides a new perspective of shortening MOF ab/desorption duration by introducing a porous nanofibrous matrix to improve the specific water production for the solar-driven ab/desorption water harvesting technique.

关键词： electrospinning fast vapor transport MIL-101(Cr) MOF composite membrane solar-driven moisture harvesting

A General Strategy to Electrospin Nanofibers with Ultrahigh Molecular Chain Orientation

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Engineering 2023年第10期29卷 179-187页

作者： Xian Wen Jian Xiong Zhaoyang Sun Liming Wang Jianyong Yu xiaohong qin Key Laboratory of Textile Science and Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

The degree of polymer chain orientation is a key structural parameter that determines the mechanical and physical properties of ***,understanding and significantly tuning the orientation of fiber macromolecular chains remain ***,we propose a novel electrospinning technique that can efficiently modulate molecular chain orientation by controlling the electric *** contrast to the typical electrospinning method,this technique can piecewise control the electric field by applying high voltage to the metal ring instead of the *** from this change,a new electric field distribution can be realized,leading to a non-monotonic change in the drafting *** a result,the macromolecular chain orientation of polyethylene oxide(PEO)nanofibers was significantly improved with a recordhigh infrared dichroic *** was further confirmed by the sharp decrease in the PEO jet fineness of approximately 80%and the nanofiber diameter from 298 to 114 ***,the crystallinity can also be adjusted,with an obvious drop from 74.9%to 31.7%,which is different from the high crystallinity caused by oriented chains in common *** work guides a new perspective for the preparation of advanced electrospun nanofibers with optimal orientation–crystallinity properties,a merited feature for various applications.

关键词： Molecular orientation Electrospinning Nanofibers Electric field Polyethylene oxide

Diameter Refnement of Electrospun Nanofbers:From Mechanism,Strategies to Applications

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Advanced Fiber Materials 2022年第2期4卷 145-161页

作者： Xian Wen Jian Xiong Sailing Lei Liming Wang xiaohong qin Key Laboratory of Textile Science and Technology of Ministry of Education College of TextilesDonghua UniversityShanghai 201620China

Electrospinning has drawn wide attention for its powerful capacity to produce ultrafne nanofbers(UNFs)from various *** UNFs demonstrated signifcantly enhanced performance,such as ultra-high surface area,more porosity and stronger mechanical ***,we comprehensively review their basic principles,state-of-the-art methods and preponderant *** begin with a brief introduction to the refnement theory of polymer jets,followed by discussion of factors afecting fber *** then discuss the refning strategies from the aspects of solution properties,spinning parameters,auxiliary force and ***,we highlight the most relevant and recent applications associated with the remarkable features of UNFs,including fltration materials,supercapacitors,biomedical materials and other *** the end,we ofer perspectives on the challenges,opportunities,and new directions for future development of electrospun UNFs.

关键词： Electrospinning Diameter refnement Ultrafne nanofbers Principles Applications

Photoelectric properties of thin Eu^(3+)-doped TiO_2 films sensitized by cis-RuL_2(SCN)_2·2H_2O

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Rare Metals 2006年第z1期25卷 169-172页

作者： WU xiaohong qin Wei WANG Song JIANG Zhaohua GUO Yun XIE Zhaoyang Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China Department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China National Laboratory of Vacuum & Cryogenics Technology and Physics Lanzhou 730000 China National Laboratory of Vacuum & Cryogenics Technology and Physics Lanzhou 730000 China

Thin nanocrystalline TiO2 films doped by europium ions (Eu3+) were obtained by the sol-gel method. The photoelectric properties of Eu3+-doped TiO2 film electrode sensitized by cis-RuL2(SCN)2·2H2O (L=cis-2,2′-bipyridine-4,4′-dicarboxlic acid) ruthenium complex were studied. The thin films were characterized by X-ray diffraction, atomic force microscopy and X-ray photoelectron spectroscopy. Effect of doping Eu3+ on microscopic structure and photoelectrical properties were discussed. The result shows that doping europium ions makes specific surface area of these films larger, which contributes to improving the photoelectric properties. It is found that an optimal composition doped with 0.2 mol.% Eu3+ exhibits the highest photoelectric properties. Isc is 0.37 mA·cm-2, which is 0.17 mA·cm-2 bigger than that of un-doped films; Voc is 405 mV, which is 50 mV bigger than that of un-doped films.

关键词： europium ions nanocrystalline TiO2 films photoelectric properties

Reconfiguration and self-healing integrated Janus electrospinning nanofiber membranes for durable seawater desalination

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Nano Research 2023年第1期16卷 489-495页

作者： Huijie Liu Jiatai Gu Ye Liu Lei Yang Liming Wang Jianyong Yu xiaohong qin Key Laboratory of Textile Science&Technology of Ministry of Education College of TextilesDonghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials International Joint Laboratory for Advanced Fiber and Lowdimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Janus electrospinning nanofiber membranes have attracted extensive attention in the fields such as solar-driven interfacial desalination,liquid filtration,and waterproof and breathable ***,the Janus structures suffer from weak interfacial bonding and vulnerability to damage,making the durability and sustainability are highly sought after in real-word ***,we fabricate the simply reconfigurable and entirely self-healing Janus evaporator by electrospinning polypropylene glycol based polyurethane(PPG@PU)and polydimethylsiloxane based polyurethane-CNTs(PDMS@PU-CNTs)with different wettability,which are both designed based on dynamic Diels–Alder(DA)*** interface of the Janus membrane is stitched by the covalent bonds to directly improve the interface adhesion to 22 N·m−1,constructing an integrated evaporator,and thereby achieving a stable desalination rate of 1.34 kg·m−2·h−1 under one *** dissociation of DA networks allows the evaporators for self-healing and reconfiguration abilities,after which the photothermal performance is *** is the first work for the crosslinked self-healing polymer to be directly electrospun,achieving the improved interfacial bond and reconfiguration of entire evaporators,which presented promising new design principles and materials for interfacial solar seawater desalination.

关键词： Janus nanofiber membrane electrospinning interfacial bonding solar steam generation seawater desalination

Flexible, self-cleaning, and high-performance ceramic nanofiber-based moist-electric generator enabled by interfacial engineering

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Science China(Technological Sciences) 2022年第2期65卷 450-457页

作者： WANG LiMing FENG LanLan SUN Zhao Yang HE XinYang WANG RongWu qin xiaohong YU JianYong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Due to their long-term stability, even under extreme conditions, oxide ceramics have attracted significant attention in emerging fields like moist-electric generation. However, the inherent brittleness and low voltage output of oxide ceramic-based moistelectric generators(MEGs) limit their applications in wearable electronics. Herein, a facile strategy involving the combination of sol-gel electrospinning and calcination is used to fabricate flexible and freestanding Ti O_(2)/Zr O_(2)(TZ) composite nanofiber-based MEGs. The excellent flexibility of the TZ nanofiber membranes can be attributed to the suppression of their crystal structure transformation, dispersion of stress concentration, and reduction of crack propagation via interfacial engineering. The porous structure of the electrospun nanofiber membrane features an abundance of charged narrow channels for the diffusion of water molecules and generates a streaming potential. The optimal voltage output reached ~0.8 V, which is the highest value reported for an oxide ceramic-based MEG. Furthermore, the as-fabricated nanofiber-based MEG exhibits good self-cleaning capability to degrade organic pollutants under ultraviolet irradiation. By integrating mechanical flexibility, high performance, and a selfcleaning effect, this work presents a new idea for exploring diverse, efficient, and wearable oxide ceramic-based MEGs.

关键词： moist-electric generation ceramic nanofiber electrospinning flexible self-cleaning

Structural insight into substrate specificity of human intestinal maltase-glucoamylase

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Protein & Cell 2011年第10期2卷 827-836页

作者： Limei Ren xiaohong qin Xiaofang Cao LeleWang Fang Bai Gang Bai Yuequan Shen State Key Laboratory of Medicinal Chemical Biology Nankai UniversityTianjin 300071China College of Pharmacy Nankai UniversityTianjin 300071China College of Life Sciences Nankai UniversityTianjin 300071China

Human maltase-glucoamylase(MGAM)hydrolyzes linear alpha-1,4-linked oligosaccharide substrates,playing a crucial role in the production of glucose in the human lumen and acting as an efficient drug target for type 2 diabetes and *** amino-and carboxyl-terminal portions of MGAM(MGAM-N and MGAM-C)carry out the same catalytic reaction but have different substrate *** this study,we report crystal structures of MGAM-C alone at a resolution of 3.1Å,and in complex with its inhibitor acarbose at a resolution of 2.9Å.Structural studies,combined with biochemical analysis,revealed that a segment of 21 amino acids in the active site of MGAM-C forms additional sugar subsites(+2 and+3 subsites),accounting for the preference for longer substrates of MAGM-C compared with that of ***,we discovered that a single mutation of Trp1251 to tyrosine in MGAM-C imparts a novel catalytic ability to digest branched alpha-1,6-linked *** results provide important information for understanding the substrate specificity of alphaglucosidases during the process of terminal starch digestion,and for designing more efficient drugs to control type 2 diabetes or obesity.

关键词： MGAM C-terminal domain inhibitor crystal structure acarbose type 2 diabetes

Simulation of Bimodal Fiber Distribution Effect on Transient Accumulation of Particles During Filtration

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Journal of Shanghai Jiaotong university(Science) 2021年第2期26卷 176-185页

作者： AKAMPUMUZA Obed WU Jiajun QUAN Zhenzhen qin xiaohong College of Textiles Donghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China Uganda Industrial Research Institute P.O.Box 7086.KampalaUganda

Modeling has become phenomenal in developing new *** the case of filters,one of the mos applied procedures is via the construction of idealized physical computational models bearing close semblance to real filter *** is upon these that multi-physics tools were applied to analvze the fow of fuid and the resulting typical performance *** this work,two 3D filter membranes were constructed with MATLAB:one had a random distribution of unimodal nanofibers,and the other,a novel modification,formed.a bimodal distribution:both of them had similar dimensions and solid volume fractions.A comparison of their performance in a dust-loading environment was made by using computational fluid dynamic-discrete elemen method(CED-DEM)coupling technique in STAR-CCM+.It was found that the bimodal nanofiber membrane greatly improved the particle capture *** this increased the pressure drop,the gain was not ***,the results of the figure of merit ptoved that adopting a bimodal formation improved the filter's quality.

关键词： 3D virtual filters computational fluid dynamic(CFD) discrete element method(DEM) coupling simulation dust loading,STAR-CCM+

Highly stretchable,durable,and breathable thermoelectric fabrics for human body energy harvesting and sensing

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Carbon Energy 2022年第4期4卷 621-632页

作者： Xinyang He Jia Shi Yunna Hao Mantang He Jiaxin Cai xiaohong qin Liming Wang Jianyong Yu Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghaiChina Innovation Center for Textile Science and Technology Donghua UniversityShanghaiChina

Stretchable thermoelectrics have recently attracted widespread attention in the field of self-powered wearable electronics due to their unique capability of harvesting body ***,it remains challenging to develop thermoelectric materials with excellent stretchability,durable thermoelectric properties,wearable comfort,and multifunctional sensing properties ***,an advanced preparation strategy combining electrospinning and spraying technology is proposed to prepare carbon nanotube(CNT)/polyvinyl pyrrolidone(PVP)/polyurethane(PU)composite thermoelectric fabrics that have high air permeability and stretchability(~250%)close to those of pure PU nanofiber ***,PVP can not only improve the dispersion of CNTs but also act as interfacial binders between the CNT and the elastic PU ***,both the electrical conductivity and the Seebeck coefficient remain unchanged even after bending 1000 *** addition,self-powered sensors for the mutual conversion of finger temperature and language and detection of the movement of joints to optimize an athlete's movement state were successfully *** study paves the way for stretchable thermoelectric fabrics with fascinating applications in smart wearable fields such as power generation,health monitoring,and human–computer interaction.

关键词： air permeability carbon nanotubes durability self-powered sensors stretchable thermoelectrics