Weilin Xu

Wuhan Textile University, Wu-han-shih, Hubei, China

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Publications (157)287.9 Total impact

  • Journal of Natural Fibers 05/2015; 12(3):211-221. DOI:10.1080/15440478.2014.918007 · 0.51 Impact Factor
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    ABSTRACT: Sodium vanadate (Na5V12O32 or Na1.25V3O8) nanowire arrays successfully prepared using a facile hydrothermal method with subsequent calcination. The length of Na5V12O32 nanowire arrays on titanium foil are about 10.5 μm. The unique architecture renders the high-rate transportation of lithium ions that is attributed to their nanosized structure, active materials connected to current collector and high specific surface area. When the Na5V12O32 nanowire arrays on titanium foil annealed at 250 °C as electrodes for lithium-ion batteries exhibite significantly capacity stability with a capacity from 339.3 to 289.7 mAh∙g-1 in 50 cycles at 50 mA∙g-1. The superior electrochemical performance demonstrated that the Na5V12O32 nanowire arrays are a promising electrode for secondary organic lithium-ion batteries.
    RSC Advances 04/2015; 5(53). DOI:10.1039/C5RA01102G · 3.71 Impact Factor
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    ABSTRACT: Monodispersed inorganic oxide nanoparticles are one kind of the most commonly used templates for efficient and controllable preparation of conducting polymer nanostructures. In this article, we report the fabrication and characterization of PPy-coated cotton fabrics through in situ chemical polymerization by using CuO nanoparticles as template. The electrical conductivity of the coated samples increases dramatically to 10.0 S cm−1 with the introduction of CuO. The electrochemical properties of the obtained fabrics are examined by cyclic voltammetry and charge/discharge analysis. The increase of scan rate in the range of 5-50 mV s−1 has a small effect on the specific capacitance for the fabric electrode, pointing out the improved ion transportation in this electrode. The charge/discharge test further reveals that the fabric device shows high specific capacitance (225 F g−1 at a current density of 0.6 mA cm−2) and good cycling performance (about 92 % capacitance retention after 200 cycles) in aqueous electrolyte. These PPy-coated fabrics have potential to be used as electrode materials for wearable supercapacitors.
    Cellulose 04/2015; 22(2). DOI:10.1007/s10570-015-0546-x · 3.03 Impact Factor
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    ABSTRACT: Nonisothermal crystallization kinetics of pure polypropylene and polypropylene/down feather fiber composites were investigated using a differential scanning calorimeter at five different cooling rates. The experimental data on crystallinity versus temperature were analyzed by Avrami, Ozawa, and Liu models, respectively. The results indicated that the presence of down feather fiber served as nucleating agent and increased the onset and peak temperatures of crystallization of polypropylene/down feather fiber composites. Interestingly, polypropylene/down feather fiber composites showed a slower primary crystallization and a faster secondary crystallization than pure PP, meaning that down feather fiber retired the crystallizaiton process of PP matrix. The nucleation activity and activation energies were also calculated and agreed well with these results. Wide-Angle X-ray diffraction patterns indicated that down feather fiber induced the formation of β-monoclinic crystals in polypropylene matrix. These phenomena were definitely different from the nonisothermal crystallization kinetics of polypropylene composite based on inorganic particles and organic cellulose fibers. POLYM. COMPOS., 2015. © 2015 Society of Plastics Engineers
    Polymer Composites 04/2015; DOI:10.1002/pc.23508 · 1.46 Impact Factor
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    ABSTRACT: Ionic liquid, 1-butyl-3-methylimidazolium chloride, was used as the solvent of silk fibroin (SF) polymer for its homogeneous chemical modification by chlorosulfonic acid in a non-aqueous system. The sulfation of SF in the ionic liquid possesses several obvious advantages, such as mild reaction condition, high modification degree, low degradation and requiring no dialysis process. The incorporation of sulfate groups was confirmed by infrared spectroscopy and its amount was measured by elemental analysis. 1H NMR spectra revealed that the sulfation occurred mainly at tyrosine and serine residues. The coagulation time tests showed the anticoagulant activity of SF which was induced by the incorporated group.
    Materials Letters 03/2015; 143. DOI:10.1016/j.matlet.2014.12.140 · 2.27 Impact Factor
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    ABSTRACT: Ultraviolet (UV) irradiation can cause a severe damage to textiles, such as color fading, polymer degradation, and mechanical strength decrease. The aim of this study was to deposit inorganic UV blocking agents onto polyamide/aramid dyed fabric using atomic layer deposition (ALD) technique to produce functional fabrics that are resistant to high intensity UV light. Scanning electron microscopy (coupled to energy-dispersive spectroscopy), X-ray photoelectron spectroscopy, and thermogravimetry studies demonstrated that TiO2, Al2O3, and TiO2/Al2O3 nanolayer could be successfully deposited onto the fiber surface. The dyed fabrics with different ALD coatings showed excellent high intensity UV resistance and were also more resistant to high intensity UV-induced mechanical strength damage. These results suggested that the ALD technology could be effective technique to improve the properties of dyed fabrics. POLYM. ENG. SCI., 2015. © 2015 Society of Plastics Engineers
    Polymer Engineering and Science 03/2015; DOI:10.1002/pen.24068 · 1.44 Impact Factor
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    ABSTRACT: V2O5 nanowires on conductive substrate are obtained by annealing the NH4V4O10 nanowires.•V2O5 nanowires are coated with polypyrrole (PPy) to form PPy@V2O5 nanocomposites.•The PPy@V2O5 nanocomposites exhibit a high stable discharge capacity.•A flexible PPy@V2O5//LiMn2O4 aqueous lithium battery is assembled and tested.
    Journal of Colloid and Interface Science 02/2015; 439. DOI:10.1016/j.jcis.2014.10.011 · 3.55 Impact Factor
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    ABSTRACT: A new nonspecific protein antifouling polysulfone (PSU) material has been elaborated by grafting zwitterionic sulfobetaine (SB) complex by the means of PSU azidation (PSU-N3) followed by “Click-Chemistry” with acetylenic zwitterionic SB monomer (N,N'-diethyl-N-propargyl-N- (3-sulfopropyl) ammonium (DEPAS)). Azidation (PSU-N3) and functionalization (PSU-g-DEPAS) PSU materials were characterized by 1H NMR, Fourier transform infrared spectroscopy, and thermogravimetric analysis. Contact angle and protein adsorption on PSU-g-DEPAS and unmodified PSU membrane were studied. The results show that the chemical modification of PSU improved both the hydrophilicity and antiprotein absorption ability. This new fouling-resistance to protein material has potential for biomaterials applications. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 41327.
    Journal of Applied Polymer Science 01/2015; 132(4). DOI:10.1002/app.41327 · 1.64 Impact Factor
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    ABSTRACT: Two novel chelating anion nitronyl nitroxide radical bridged dinuclear lanthanide complexes [Tb2(hfac)4(NIT2PhO)2] (1) and [Ho2(hfac)4(NIT2PhO)2] (2) [hfac = hexafluoroacetylacetonate; NIT2PhO = 2-(2′-hydroxyphenyl)-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide] were prepared and structurally characterized by single crystal X-ray diffraction, elemental analysis, and IR spectroscopy. Both complexes are dinuclear phenoxo-O anion bridged with the oxygen atom of the N–O group coordinated to a single Ln(hfac)2 unit. The central Ln atoms exhibit a heptacoordinated environment, and the shape around the metal atom is capped octahedral. This structure is first reported in the lanthanide-nitronyl nitroxide system. It provides an innovative approach to synthesize new dinuclear lanthanide-nitroxide-based complexes. Additionally, the magnetic properties of the two complexes are studied.
    Zeitschrift für anorganische und allgemeine Chemie 01/2015; 641(3-4):n/a-n/a. DOI:10.1002/zaac.201400497 · 1.25 Impact Factor
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    ABSTRACT: The nonisothermal crystallization kinetics of polypropylene/down feather fiber composites were investigated using a Differential Scanning Calorimeter at five different cooling rates. The Avrami and Liu models were able to satisfactorily describe the crystallization behavior of composites, which indicated the entirely unique mechanism. It was found that fiber/matrix interface and thermal conductivity of fiber had key roles for the crystallization behavior of composites and had a close relationship with the properties of the industrial product reinforced with natural protein fiber. The nucleation activity and activation energies were also calculated by different theoretical models and also proved the experimental results.
    Composites Part B Engineering 01/2015; 68:300-309. DOI:10.1016/j.compositesb.2014.09.004 · 2.60 Impact Factor
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    ABSTRACT: In this study, the agricultural solid waste, natural down fibers were produced into superfine down particle (NSDP), which was used as a low-cost adsorbent for the removal of direct fast scarlet 4BS (DFS-4BS) from aqueous solution. Scanning electron microscopy (SEM), N2 adsorption/desorption, and Fourier Transform infrared spectroscopy (FTIR) were used to characterize the adsorbent material, respectively. The effects of pH, adsorbent dose, initial dye concentration, temperature, and contact time on the adsorption capacity of DFS-4BS by NSDP were studied. The experimental adsorption data were well fitted by Langmuir adsorption isotherm and the maximum adsorption capacity of DFS-4BS by NSDP was found to be 120.34 mg/g at 45 °C, which was higher than other reported adsorbent. Overall, NSDP could be used as an effective and low-cost adsorbent to remove DFS-4BS from industrial wastewater.
    Fibers and Polymers 01/2015; 16(1):73-78. DOI:10.1007/s12221-015-0073-2 · 1.11 Impact Factor
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    ABSTRACT: In this article, cellulose membranes (CMs) containing zwitterionic sulfobetaine groups were prepared from cellulose membranes with azide groups and N,N-Diethyl-N-Propargyl-N-(3-sulfopropyl) ammonium via click chemistry in a one pot two-step grafting reaction. The CMs were fully characterized by attenuated total reflectance Fourier transform infrared spectra, X-ray photoelectron spectroscopy, X-ray spectroscopy analysis. Results showed that zwitterionic monomers were successfully grafted from CM surfaces and the surface morphologies were investigated by scanning electron microscope and atomic forced microscope. It has been proved that the surface roughness of zwitterionic sulfobetaine functionalized cellulose membranes were greater than the starting cellulose membranes. This new member has potential for biomedical applications.
    Polymer Bulletin 10/2014; 71(10). DOI:10.1007/s00289-014-1207-1 · 1.49 Impact Factor
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    ABSTRACT: Biomedical polyurethane (BPU) porous membranes with controlled morphology and excellent permeability and mechanical properties were prepared via a method involving a phase inversion induced by water micro-droplets, which were generated by an ultrasonic atomizer. The cross-section morphology, air permeability and mechanical properties of the porous membranes were investigated. The SEM images demonstrated that the adjacent pores were connected by a micro-hole, serving as a "backdoor" for the pore. An interconnected porous structure was obtained, improving the air permeability of the BPU membrane relative to the membrane produced by immersion precipitation. Our studies indicated that the diameter of the pores in the membrane depended on the solution viscosity, allowing porous membranes with a desired morphology to be obtained by adjusting the polymer concentration and solution viscosity. The application of micro-droplets of water during membrane preparation reduced the exchange rate between the solvent and nonsolvent, resulting in the microphase separation of polymer molecules and the formation of a uniform porous structure in the membrane, which improved the air permeability and mechanical properties of the BPU porous membranes. This is a simple and effective preparation method for high-performance porous membranes with potential applications in tissue engineering scaffolds, controlled-release drug delivery and vascular grafts.
    Polymer 09/2014; 55(21). DOI:10.1016/j.polymer.2014.08.058 · 3.77 Impact Factor
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    ABSTRACT: The current dye-sensitized solar cell (DSSC) technology is mostly based on fluorine doped tin oxide (FTO) coated glass substrate. The main problem with the FTO glass substrate is its rigidity, heavyweight and high cost. DSSCs with a fabric as substrate not only offer the advantages of flexibility, stretchability and light mass, but also provide the opportunities for easy implantation to wearable electronics. Herein, a novel fabric counter electrode (CE) for DSSCs has been reported employing a daily-used cotton fabric as substrate and polypyrrole (PPy) as catalytic material. Nickel (Ni) is deposited on the cotton fabric as metal contact by a simple electroless plating method to replace the expensive FTO. PPy is synthesized by in situ polymerization of pyrrole monomer on the Ni-coated fabric. The fabric CE shows sufficient catalytic activity towards the reduction of I3−. The DSSC fabricated using the fabric CE exhibits power conversion efficiency of ∼3.30% under AM 1.5.
    Journal of Power Sources 07/2014; 257:230–236. DOI:10.1016/j.jpowsour.2014.01.123 · 5.21 Impact Factor
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    ABSTRACT: Morphological, thermal, and mechanical features of electrosprayed and electrospun deposition of the silk-inspired polyurethane (PU) containing GlycineAlanineGlycineAlanine (GlyAlaGlyAla, the featured peptide sequence of silkworm silk fibroin) tetrapeptide, which was synthesized by the traditional liquid-phase peptide synthesis method and the classical two-step polymerization method using Boc-protected amino acids and diisocyanates as starting materials, were characterized. The results show that the synthesized silk-inspired PU dissolved in tetrahydrofuran (THF) can be easily electrosprayed or electrospun into the film form, although its molecular weight ranging from 13,000 to 15,000 is quite low. Elastomeric fibrous membranes with surface morphologies of “droplets,” “bead-on-string,” and “nonwoven fibers” have been obtained by electrospraying and electrospinning the silk-inspired PU/THF solution of varying concentrations. The thermograms confirm high thermostability of the silk-inspired PU between 350 and 400°C due to the polar peptide linkages. The tanδ peak of dynamic mechanical analysis curve corresponding to its glass transition temperatures is detected at −34.3°C. Its elongation at break is about 140–150%, and the breaking tensile strength ranges from 22 to 27 MPa, which is consistent with the data of other PUs containing l-alanine residue. Information provided by this study can be used to better understand the correlation between the natural and man-made silk polymers. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40245.
    Journal of Applied Polymer Science 05/2014; 131(10). DOI:10.1002/app.40245 · 1.64 Impact Factor
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    ABSTRACT: Hollow SnO2?ZnO hybrid nanofibers are prepared by a single-nozzle electrospinning technique followed with subsequent heat treatment. The structure and morphology of the samples are characterized by x-ray diffraction, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy and transmission electron microscopy. The as-prepared nanofibers are solid, which maintain after annealing up to 400 ?C; while they turn to tubular morphology after annealing at 500 ?C. After annealing at 700?900 ?C, some of the tubular nanofibers combine together. The FTIR results show that poly (vinylpyrrolidone) is completely removed after annealing at 500 ?C. The electrode of hollow SnO2?ZnO nanofibers obtained by calcination at 500 ?C delivers a high discharge capacity of 546.5 mAh g?1 after 100 cycles at a current density of 100 mA g?1.
    04/2014; 1(2):025012. DOI:10.1088/2053-1591/1/2/025012
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    ABSTRACT: Ultrafine silk fibroin powder was successfully produced using our developed machine and used as low-cost adsorbent to remove dyes in the printing and dyeing wastewater. The silk powder thus prepared was characterized by scanning electronic microscopy (SEM), laser particle analyzer and Fourier transform infrared (FTIR) spectrum. It showed that the silk powder with an average diameter of 3.8 mu m was dominant in beta-sheet structure. Dye adsorption experiments demonstrated that silk powder could effectively remove model dyes including direct orange (DO), disperse blue (DB) and methylene blue (MB) in particular. Factors influencing the adsorption of MB, e.g., solution pH, contact time, adsorption concentration and ionic strength were systematically investigated. Isotherm equilibrium studies demonstrated that MB adsorption process followed Langmuir model. The maximum adsorption capacity for MB dye was estimated to be 20.58 mg/g and the decoloration percentage could reach up to 95%. The batch experimental results suggested that silk fibroin powder could be used as an efficient sorbent to remove dyes in textile effluents.
    Advanced Powder Technology 03/2014; 25(2):574–581. DOI:10.1016/j.apt.2013.09.007 · 1.64 Impact Factor
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    ABSTRACT: In order to improve the biomedical property of Blealla striata polysaccharide (BSP), this study presents a new method of BSP fiber preparation and its mechanical properties were preliminarily tested. BSP with excellent biocompatibility was extracted from a traditional Chinese herb, B. striata, by using an immersion precipitation phase-inversion approach. BSP fibers were prepared by wet spinning using ethanol as the coagulant at room temperature. The morphology of BSP fibers was observed by scanning electron microcopy (SEM), and it has been found that the shape of the fibers was flat. The formation of the flat shape contributed to the slow exchange rate between the solvent and the nonsolvent. The stress at break, strain at break, initial modulus and energy at break point of the BSP fibers increased with increasing BSP concentration in the spinning solutions. The excellent spinnability, mechanical property and biocompatibility enable the BSP fibers to be an ideal material in the potential applications such as tissue engineering scaffold and wound dressing. (C) 2013 Elsevier B.V. All rights reserved
    Materials Letters 02/2014; 117:208-210. DOI:10.1016/j.matlet.2013.05.098 · 2.27 Impact Factor
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    ABSTRACT: Polypyrrole/lignosulfonate (PPy/LGS) coated cotton fabrics have been prepared via in situ oxidation polymerization of pyrrole in the presence of lignosulfonate as both template and dopant. The mass loading on the fabric samples decreases dramatically with the increased LGS content. The electrical conductivity of the coated fabrics achieved 3.03 S cm−1 under the optimized conditions. The electrochemical properties of the coated fabrics were investigated using cyclic voltammetry and galvanostatic charge-discharge measurements. The specific capacitance of the coated fabrics can be as high as 304 F g−1 at a current density of 0.1 A g−1 in aqueous electrolyte. These novel fabrics are desirable for applications in wearable supercapacitors.
    RSC Advances 01/2014; 4(12):6261. DOI:10.1039/c3ra47224h · 3.71 Impact Factor
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    ABSTRACT: Porous anodic alumina (PAA) with highly ordered arrays of nanopores was prepared on Al fabrics or foils by a two-step anodization process. Studies on structural and thermal properties of the prepared PAA membranes were carried out. Scanning electron microscopy and transmission electron microscopy were performed on the prepared PAA membranes at room temperature and 600 °C. Photoluminescence (PL) properties of PAA on Al foils under different annealing temperatures (100–600 °C) and PAA on Al fabrics before-after dyeing by Rhodamine B (RhB) have been investigated. For PAA on Al foils, with the increase of the annealing temperature, the PL intensity increases first, which reaches a maximum value at 500 °C, and then it decreases. For PAA on Al fabrics after dyeing by RhB, the white sample changed to pink and a new peak at 580 nm in the PL curve was found.
    Materials Science and Engineering B 01/2014; 179:71–76. DOI:10.1016/j.mseb.2013.09.017 · 2.12 Impact Factor

Publication Stats

819 Citations
287.90 Total Impact Points

Institutions

  • 2008–2015
    • Wuhan Textile University
      Wu-han-shih, Hubei, China
    • University of Texas at Austin
      Austin, Texas, United States
  • 2010–2012
    • Donghua University
      • College of Textile
      Shanghai, Shanghai Shi, China
  • 2006–2010
    • Wuhan University of Science and Technology
      Wu-han-shih, Hubei, China
  • 2009
    • Huazhong University of Science and Technology
      Wu-han-shih, Hubei, China
  • 2008–2009
    • Government of the People's Republic of China
      Peping, Beijing, China
  • 2007
    • Feng Chia University
      臺中市, Taiwan, Taiwan
  • 2001–2006
    • Wuhan Institute of Technology
      Wu-han-shih, Hubei, China