Weilin Xu

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

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Publications (141)196.98 Total impact

  • [Show abstract] [Hide abstract]
    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). · 1.33 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 08/2014; · 1.40 Impact Factor
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    ABSTRACT: Ultrafine silk fibroin powder is prepared using our developed machine with special method and displays an excellent capability to decolorize model dyes commonly used in dyeing industry as eco-friendly adsorbents.
    Advanced Powder Technology 01/2014; 25(2):574–581. · 1.65 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 01/2014; 257:230–236. · 5.26 Impact Factor
  • Polymer. 01/2014;
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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. · 1.85 Impact Factor
  • Materials Letters. 01/2014; 117:208-210.
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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 12/2013; · 1.40 Impact Factor
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    ABSTRACT: Antifouling nanofibers with zwitterionic materials on surfaces that can prevent the nonspecific adhesion of biomolecules and microorganism are in demand for high efficiency biosensors and affinity membranes. The functionalization of zwitterionic sulfobetaine on surfaces of PVA-co-PE nanofiber membrane via click chemistry is performed employing two synthesis routes and reported in this paper. PVA-co-PE nanofiber membranes were activated with cyanuric chloride, and then surface functionalized with sodium azide or 2-propynylamine to prepare “clickable” nanofibers with azide or alkynyl groups, respectively. The zwitterionic sulfobetaine was finally “clicked” onto PVA-co-PE nanofiber membranes. The successful surface functionalizations of PVA-co-PE nanofiber membrane were confirmed with FTIR-ATR, Raman spectroscopy, XPS and EDS. The analysis of element composition using XPS indicated that alkynylation of activated PVA-co-PE nanofiber membranes can “click” more sulfobetaines on nanofiber surfaces than surface azidation. SEM results showed that functionalized PVA-co-PE nanofiber membranes maintained well-defined nanofibrous morphology. PVA-co-PE nanofiber membranes with zwitterionic sulfobetaine demonstrated excellent antifouling performance by effectively resisting bovine serum albumin (BSA) protein adsorption.
    RSC Advances 10/2013; 3(43). · 3.71 Impact Factor
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    ABSTRACT: Nanostructured Co3O4 in a novel hairy ball-like morphology is successfully synthesized from self-assembled hierarchical Co(CO3)0.35Cl0.2(OH)1.10·1.74H2O precursors via a facile hydrothermal method and subsequent annealing in air. The morphological evolution of the Co(CO3)0.35Cl0.2(OH)1.10·1.74H2O precursors is investigated by examining the different reaction times during the synthesis. First, fan-shaped microplates are formed, followed by nanowires grown on the surface of the plates. Subsequently, with an extended growth reaction time, the nanowires grow longer to form the hairy ball-like structures. The Co3O4, obtained from thermal decomposition of the Co(CO3)0.35Cl0.2(OH)1.10·1.74H2O precursor in air at 400 °C, exhibits highly reversible capacities as an anode material in lithium ion batteries, which retains 860 mA h g−1 at 100 mA g−1 after 50 cycles, with good cycling stabilities and rate capabilities.
    J. Mater. Chem. A. 10/2013; 1(42).
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    ABSTRACT: Biomedical polyurethane (BPU) and silk fibroin have similarly molecular architecture in their primary and aggregate structure, both of which have amide bonds and microphase separation, and they have been employed as scaffold materials for biomedical applications. Based on this, as the featured peptide sequence of silkworm silk fibroin, GlycineAlanineGlycineAlanine (GlyAlaGlyAla) tetrapeptide was synthesized by using traditional liquid-phase peptide synthesis method with Boc-protected glycine and alanine as starting materials, and was transformed to its derivative with two amine-terminated functional groups. The derivative was introduced as a chain extender into the backbone to form the hard segment of a silk-inspired PU with urea-linkage. Related measurements show that molecular weight of the synthesized silk-inspired PU ranged from 13,000 to 15,000. Fourier transform infrared (FTIR) absorption bands of Amides I and II are at 1651 cm−1 and 1534 cm−1, and Raman absorption band of Amide III is at 1302 cm−1. UV-Vis absorption peak of the silk-inspired PU is at 266 nm. This new concept and strategy may allow the fabrication of a new class of thermoplastic polyurethane elastomers to mimic the structure and properties of silk fibroin of silkworms and spiders. Information provided by this study may be used to better understand the correlation between the natural and man-made materials. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
    Journal of Applied Polymer Science 10/2013; 130(1). · 1.40 Impact Factor
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    ABSTRACT: Highly ordered ZrO2 nanotube arrays have been fabricated by anodization at different voltages between 20–50 V. Photoluminescence of the as-prepared freestanding ZrO2 membrane were tested and photocatalytic activities of ZrO2 nanotube arrays were characterized by quantifying the degradation of methyl orange dye solution. It was found that the as-prepared samples exhibited two types of photoluminescence peaks, one is stable peaks and another is unstable peaks which shift with the excitation wavelength. In the samples annealed at 400 °C, only stable peaks are presented. The decolorization percentage decreases with a higher solution concentration, while increases with a larger diameter of ZrO2 nanotubes.
    Optical Materials 05/2013; 35(7):1461–1466. · 1.92 Impact Factor
  • Source
    Zhigang Xia, Weilin Xu
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    ABSTRACT: In this article, ring staple single yarn spinning method development has been reviewed after an introductory background about ring spinning principle and ring staple yarn defect problems. The review concludes that previous novel ring staple spinning methods have been developed mainly on a basis of staple spinning strand control enhancements by means of separating single strands into two or several subones, concentrating triangular ring spinning strand, rewrapping protruding fiber ends, and improving online twisting density distribution. Reputed novel ring spinning technologies are included in this review such as siro-spinning, solo-spinning, compact spinning, air-jet spinning, air-suction spinning, and Nu-torque yarn spinning. The inadequacy of some reviewed novel spinning methods is considered as a motility of ring spinning method further development. It is predicted that ring staple spinning can be further developed via increasing spinning efficiency and improving online spinning strand properties. KEYWORDS ring spinning,
    Journal of Natural Fibers 04/2013; 10(1):62-81. · 0.56 Impact Factor
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    ABSTRACT: The geometries, electronic structures and absorption spectra of two unsymmetrical squaraine dyes (SQ1 and SQ2) were theoretically investigated by using density functional theory (DFT) and time-dependent DFT (TD-DFT). The dye-(TiO2)9 nanocluster systems were also simulated to show the electronic coupling at the interface. The results reveal that compared to SQ1, SQ2 with an electron-rich thiophene spacer and a strongly π-accepting carboxycyanovinyl group could cause a red shift of the absorption spectrum, increase the oscillator strength and improve the light harvesting efficiency, thus leading to the larger short-circuit photocurrent density (JSC) in dye-sensitized solar cells (DSSCs), in good agreement with experimental data. While the larger normal dipole moment pointing outward from the semiconductor surface of SQ2 is the major factor resulting in the higher open-circuit photovoltage (VOC). Then, we designed another six dyes with different π-spacers to screen dyes with improved performance. The results indicate that SQ6, SQ7 and SQ8 with benzathiadiazole, bithiophene and thienothiophene spacer, respectively, will be more efficient squaraine dyes used in DSSCs. This study is expected to assist the design and synthesis of novel squaraine dyes.
    RSC Advances 03/2013; 3(15):5227-5237. · 3.71 Impact Factor
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    ABSTRACT: The superfine down powder (SDP) was chemically modified using phenyl isocyanate (PI) and octadecyl isocyanate(ODI), respectively. The wetting behavior of water on the SDP surface was observed by the contact angle. The modified and unmodified SDP-filled polypropylene (PP/SDP) fibers were prepared and characterized by the moisture absorption experiments and thermal and mechanical analysis. The PI- and ODI-modification improved the hydrophobic property of SDP, and the excellent moisture absorption of SDP remained as such. The addition of SDP improved the moisture absorption and thermal stability of the PP fiber. The modification of PI and ODI strengthened the mechanical property of the blend fiber. © 2012 Wiley Periodicals, Inc. Adv Polym Techn 32: E514–E519, 2013; View this article online at wileyonlinelibrary.com. DOI 10.1002/adv.21297
    Advances in Polymer Technology 03/2013; 32(S1). · 1.10 Impact Factor
  • Xin Liu, Shaojin Gu, Weilin Xu
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    ABSTRACT: The thermal degradation of down fiber and down powder was studied using TG, DSC, TG-FTIR, and ATR-FTIR as a function of mass loss. For both down fiber and down powder, two evident mass loss stages were observed. Compared to down fiber, down powder had higher moisture and lower thermal stability. The oxygen in air weakened the mass loss of superfine down powder in the temperature range of 300–530 °C, and accelerated the oxidation–reduction reaction between oxygen and powder when the temperature was over 530 °C. The microstructures of down fiber and down powder were investigated on the analysis of DSC results. As the decrease in the average particle size of down powder, the absorbed energy of the destruction of crystallinity, rupture of crosslinks and thermal degradation of peptide bonds decreased, respectively. The gases evolved during thermal degradation of superfine down powder were inspected by in situ FTIR, and then the solid residues collected at different temperature were analyzed using ATR-FTIR. The color evaluation of superfine down powder hot-pressed at high temperature was discussed to confirm the best hot-processing condition.
    Journal of Thermal Analysis and Calorimetry 01/2013; 111(1). · 1.98 Impact Factor
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    ABSTRACT: As a biomaterial, besides excellent biocompatibility and biodegradability, suitable macropores and pores structure should be provided to guide cell extension and migration. In present study, the silk fibroin (SF) scaffold with uniaxial channels was prepared by directional temperature field freezing technique. The average pore diameter, pore density and porosity of the scaffold with oriented channels are ∼128.7 µm, ∼158 mm−2 and ∼91.4 %, respectively. By controlling of the temperature gradient direction, the oriented multichannels of the scaffolds were formed in longitudinal easily. In process of the scaffolds fabrication, the directional growth of ice crystal could shear and draft to the silk fibroin molecule segments, which resulted in the new crystal nucleus formation in new zone and increase of β-sheet components in the scaffolds. In vitro, L929 cells were seeded on the scaffolds with oriented channels to evaluate the effect on cell behavior. Cell viability, adhesion and morphology were determined by methyl thiazolyl tetrazolium, confocal microscope and scanning electron microscope. The results showed that the cells anchored on the oriented channels, spread along the direction of the channels and hold a higher viability on the scaffolds with oriented channels. These new oriented multichannel scaffold could guide the adhesion and proliferation of L929 cells, which hold a potential in tissue engineering.
    Fibers and Polymers 01/2013; 14(11). · 1.11 Impact Factor
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    ABSTRACT: Porous polyurethane (PU) membrane was fabricated by the method of phase separation using water droplets produced from ultrasonic atomizer as coagulation bath. The morphology of PU membrane was characterized by scanning electron microscope, and these images indicated that regular micropores were formed on cross-section surface. The formation of regular micropores attributes to the decrease of exchange rate between solvent and nonsolvent. One interesting and important structure was built in porous PU membrane. Some small holes were observed on every micropores wall. Adjacent micropores were connected by these small holes, which provided channels for the moving of water droplets. The effect of PU solution concentration on the morphology as well as size of micropores was studied. The average diameter of micropores and small holes decreased as the PU solution concentration increased from 10% to 25%. We believed that the prepared PU membranes with connected micropores have excellent permeability and potential applications in tissue engineering and artificial organs.
    Materials Letters. 01/2013; 100:23-25.
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    ABSTRACT: Conductive nanocomposite membranes of polypyrrole/bacterial cellulose (PPy/BC) were fabricated in situ by oxidative polymerization of pyrrole with iron (III) chloride as an oxidant and BC as a template. The morphology of the PPy/BC membrane indicated that PPy nanoparticles deposited on the BC surface connected to form a continuous nanosheath structure by taking along the BC nanofiber. The flexible PPy/BC membrane obtained with the optimized reaction condition exhibited a high electrical conductivity of 3.9 S cm−1, which was hardly affected by bending stress. The PPy/BC membrane could be directly used as flexible supercapacitor electrodes, with a maximum discharge capacity of 101.9 mA h g−1 (459.5 F g−1) at 0.16 A g−1 current density. The capacity decreased with charge/discharge cycling, which is attributed to mechanical degradation of PPy as evidenced by scanning electron microscopy (SEM).
    Organic Electronics 01/2013; 14(12):3331–3338. · 3.84 Impact Factor
  • Dong Wang, Kai Wang, Weilin Xu
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    ABSTRACT: A novel technique of fabricating magnetic thermoplastic nanofibers by the control of the phase separation of immiscible polymer blends during melt extrusion was presented. The magnetic poly(vinyl alcohol‐co‐ethylene) (PVA‐co‐PE)/Fe3O4 composite nanofibers were prepared via the melt extrusion of cellulose acetate butyrate matrix and PVA‐co‐PE preloaded with different amounts of Fe3O4 nanoparticles. The morphologies of magnetic composite nanofibers were characterized by scanning electron microscopy. The uniform dispersion of Fe3O4 nanoparticles in nanofiber matrixes and crystal structures were confirmed using transmission electron microscopy and wide angle X‐ray diffraction. Thermogravimetric analysis was employed to quantify the exact loading amount of Fe3O4 nanoparticles in the composite nanofibers. The magnetic measurements showed that composite nanofibers displayed superparamagnetic behavior at room temperature. With increasing content of Fe3O4 nanoparticles, the saturation magnetization of the magnetic composite nanofiber significantly improved. The prepared magnetic composite nanofibers might have found potential applications in the sensors and bio‐molecular separation fields. Copyright © 2012 John Wiley & Sons, Ltd.
    Polymers for Advanced Technologies 01/2013; 24(1). · 1.64 Impact Factor

Publication Stats

209 Citations
196.98 Total Impact Points

Institutions

  • 2010–2014
    • Wuhan Textile University
      Wu-han-shih, Hubei, China
  • 2006–2011
    • Donghua University
      • College of Textile
      Shanghai, Shanghai Shi, China
    • 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
    • Deakin University
      • Australian Future Fibres Research and Innovation Centre (AFFRIC)
      Geelong, Victoria, Australia
    • Government of the People's Republic of China
      Peping, Beijing, China
    • Tianjin Polytechnic University
      T’ien-ching-shih, Tianjin Shi, China
  • 2001–2006
    • Wuhan Institute of Technology
      Wu-han-shih, Hubei, China