Weilin Xu

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

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Publications (188)372.22 Total impact

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    ABSTRACT: To obtain a hydrophobic surface, TiO2 coatings are deposited on the surface of silk fabric using atomic layer deposition (ALD) to realize a hierarchical roughness structure. The surface morphology and topography, structure, and wettability properties of bare silk fabric and TiO2-coated silk fabrics prepared are evaluated using scanning electron microscopy (SEM), field-emission scanning electron microscopy (FESEM), scanning probe microscope (SPM), X-ray diffraction (XRD), static water contact angles (WCAs), and roll-off angles, respectively. The surfaces of the silk fabrics with the TiO2 coatings exhibit higher surface roughness and excellent thermal stability compared with those of the bare silk fabric. Importantly, the hydrophobic and laundering durability properties of the TiO2-coated silk fabrics are largely improved by increasing the thickness of the ALD TiO2 coating. Meanwhile, ALD process have a litter effect on the service performance of silk fabric. Overall, TiO2 coating using an ALD process is recognized as a promising approach to produce hydrophobic surfaces for elastic materials.
    No preview · Article · Feb 2016 · ACS Applied Materials & Interfaces
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    ABSTRACT: Textile-based wearable electronics provides the combined advantages of both electronics and textiles, such as flexibility, stretchability and lightweight. Much effort has been dedicated to achieve flexible photovoltaic power for wearable electronics. Here, we have demonstrated polypyrrole (PPy) coated cotton fabrics as textile counter electrode (CE) in dye-sensitized solar cells (DSSCs). PPy is deposited on the Ni-coated cotton fabrics as catalytic material by electrochemical polymerization of pyrrole. The highly conductive PPy-coated fabric electrode with a surface resistance of 5.0 Ω sq−1 shows reasonable catalytic activity for the reduction of triiodide ion. The DSSC fabricated with the PPy-coated fabric CE exhibits a power conversion efficiency as high as ∼3.83% under AM 1.5 illumination.
    Full-text · Article · Feb 2016 · Organic Electronics

  • No preview · Article · Feb 2016 · Coloration Technology
  • Wenbin Li · Weilin Xu · Hao Wang · Xin Wang
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    ABSTRACT: The thermal and moisture behaviour of the microclimate of textiles is crucial in determining the physiological comfort of apparel, but it has not been investigated sufficiently due to the lack of particular evaluation techniques. Based on sensing, temperature controlling and wireless communicating technology, a specially designed tester has been developed in this study to evaluate the thermal and moisture behaviour of the surface of textiles in moving status. A temperature acquisition system and a temperature controllable hotplate have been established to test temperature and simulate the heat of human body, respectively. Relative humidity of the surface of fabric in the dynamic process has been successfully tested through sensing. Meanwhile, wireless communication technology was applied to transport the acquired data of temperature and humidity to computer for further processing. Continuous power supply was achieved by intensive contact between an elastic copper plate and copper ring on the rotating shaft. This tester provides the platform to evaluate the thermal and moisture behaviour of textiles. It enables users to conduct a dynamic analysis on the temperature and humidity together with the thermal and moisture transport behaviour of the surface of fabric in moving condition. Development of this tester opens the door of investigation on the micro-climate of textiles in real time service, and eventually benefits the understanding of the sensation comfort and wellbeing of apparel wearers.
    No preview · Article · Jan 2016 · Journal of Thermal Biology
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    ABSTRACT: To develop novel biocomposites, three different types of silk fibroin (SF) fabrics were, respectively, blended with poly(ϵ-caprolactone) (PCL) by a solution blending method. The effects of fabric structures on the mechanical and structural properties of PCL/SF biocomposites were investigated. Scanning electron microscopy photographs showed that SF were linked with PCL matrix. Wide-angle X-ray diffraction curves showed that PCL/SF biocomposites had higher crystallinity than pure PCL. Differential scanning calorimetry results indicated that the addition of three different types of silk fabrics changed the values of relevant thermodynamic parameter of PCL/SF biocomposites.
    No preview · Article · Jan 2016 · Journal of Natural Fibers
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    ABSTRACT: Tin (Sn) is one of the promising anode candidates for next generation applications in lithium ion batteries with high energy densities, but it suffers from drastic volume change (about 260%) upon lithiation. To address this issue, herein an efficient method is reported for coating Sn nanowires with an amorphous Al2O3 layer (Sn-Al2O3) based on a combination of mechanical pressure injection technique and partial dissolution of the anodic aluminum oxide template. Further, the Sn nanowires coated with Al2O3 are dispersed into carbon matrix (Sn-Al2O3-C) by ball milling. In this structure, Al2O3 helps to maintain structural integrity during charge–discharge process, and the introduced carbon matrix enhances electronic conductivity of the overall electrode. As a result, the Sn-Al2O3-C nanocomposite exhibits an enhanced cyclic and rate performance, namely, retaining the capacities of 1308.8 mAh g−1 at the current density of 30 mA g−1 after 20 cycles, 1063.3 mAh g−1 at the current density of 200 mA g−1, and 834.2 mAh g−1 at the current density of 500 mA g−1 after 100 cycles.
    No preview · Article · Jan 2016 · Advanced Materials Interfaces
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    ABSTRACT: Biodegradable polymers have received increased attention due to their potential application in the medicine and food industries; in particular, poly(lactic acid) (PLA) is a primary biopolymer because of its excellent biocompatibility and absorbability features. In this study, a porous PLA membrane was fabricated by phase separation using water microdroplets produced by an ultrasonic atomizer as a coagulation bath. The formation of S-type clusters was attributed to the slow exchange rate between solvent and coagulant, which provided time for the movement of polymer molecules. The effect of preparation conditions on the structure of S-type clusters, including polymer concentration in solution and ambient temperature was investigated. The PLA porous membrane prepared from water micro-droplets with different morphology compared with the sample fabricated from distilled water has potential application in fields of tissue engineering and artificial organ generation. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43355.
    No preview · Article · Jan 2016 · Journal of Applied Polymer Science
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    ABSTRACT: Silk fibroin (SF) was used to improve the biocompatibility of polysaccharide fibers isolated from the traditional Chinese herb, Bletilla striata through wet spinning at room temperature using ethanol as a coagulant. This was found to create a hybrid fiber structure through hydrogen bonding between the hydroxyl groups of the polysaccharide fibers and the amino groups of SF. Increasing SF concentration caused a loosening of this structure due to the formation of SF microspheres via ethanol-induced phase inversion, with the resulting cross-sectional variation causing first an increase then decrease in the breaking point strain of the hybrid fiber. The excellent biocompatibility and mechanical properties of these hybrid fibers makes them ideally suited for use as tissue engineering scaffolds and wound dressings.
    No preview · Article · Dec 2015
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    ABSTRACT: In this study, theoretical analysis was conducted for hair trapping by a short grooved surface contacting in different distances during conventional and siro-spinning, respectively. Then, blended cotton/ramie conventional and siro yarns were produced without and with the short grooved surface at different position distances. Hairs longer than 3 mm decreased as the surface position distance increased for both conventional and siro spun yarns, reducing short hairs by binding them onto the yarn stem. Conventional yarn hairiness H values decreased gradually as the surface position distance increased; however, siro spun yarn hairiness H values were similar without a gradual decrease as the surface position distance increased. The hair wrapping caused reduction of thin places, and occasional increase of thick places and neps for both conventional and siro yarns spun with the surface, respectively. Unevenness CVm results showed no serious deterioration after applying the surface during conventional and siro-spinning, and even some improved. The experimental results corresponded well to our theoretical analysis.
    No preview · Article · Dec 2015 · Textile Research Journal
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    ABSTRACT: Development of three-dimensional nano-architectures on current collectors has emerged as an effective strategy for enhancing rate capability and cycling stability of the electrodes. Herein, a new type of three-dimensional porous iron vanadate (Fe0.12V2O5) nanowire arrays on a Ti foil has been synthesized by a hydrothermal method. The as-prepared Fe0.12V2O5 nanowires are about 30 nm in diameter and several micrometers in length. The effect of reaction time on the resulting morphology is investigated and the mechanism for the nanowire formation is proposed. As an electrode material used in lithium ion batteries, the unique configuration of the Fe0.12V2O5 nanowire arrays presents enhanced capacitance, satisfying rate capability and good cycling stability, as evaluated by cyclic voltammetry and galvanostatic discharge-charge cycling. It delivers a high discharge capacity of 293 mAh•g-1 at 2.0-3.6 V or 382.2 mAh•g-1 at 1.0-4.0 V after 50 cycles at 30 mA•g-1.
    No preview · Article · Nov 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: To improve the hydrophilicity of chitosan fiber, N-carboxyethyl chitosan fiber was prepared through Michael addition between chitosan fiber with acrylic acid. The structure was studied by (1)H NMR. The degree of N-substitution, measured via (1)H NMR, was easily varied from 0.10 to 0.51 by varying the molar ratio of acrylic acid to chitosan. Series of properties of N-carboxyethyl chitosan fiber including mechanical property, crystallinity, thermal property and in vitro degradation were investigated by Instron machine, X-ray diffraction and differential scanning calorimetry and thermogravimetric analysis, respectively. The results showed that, introducing the carboxyethyl group into the backbone chain of chitosan fiber destroyed the intra/intermolecular hydrogen bonding, leading to loss of the intra/intermolecular hydrogen bonding and improvement of hydrophilicity. Indirect cytotoxicity assessment of carboxyethyl chitosan fibers was investigated using a L929 cell line. And the obtained results clearly suggested that N-carboxyethyl chitosan fiber was nontoxic to L929 cells. The N-carboxyethyl chitosan fibers are potential as tissue engineering scaffolds.
    No preview · Article · Nov 2015 · International journal of biological macromolecules
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    ABSTRACT: Ammonium vanadate (NH4V4O10) nanowire flowers and nanowires on titanium (Ti) foils are synthesized by hexamethylenetetramine (HMTA)-assisted hydrothermal reactions as a cathode material for lithium-ion battery. The as-prepared NH4V4O10 nanowires are about 50nm in diameter and several micrometers in length. The effects of reaction time, temperature and additive concentration on the resulting morphology are investigated. Reversible lithium intercalation behavior of the nanowires has been evaluated by cyclic voltammetry and galvanostatic discharge-charge cycling. The NH4V4O10 nanowires on Ti foil deliver a high discharge capacity of 168.5mAhg-1 after 100 cycles between 2.0 and 4.0V at 50mAg-1. A high rate capability is obtained with a remaining discharge capacity of about 182.6mAhg-1 after 35 cycles at various rates. Further, the NH4V4O10 nanowires on Ti foil have a higher discharge capacity of 330.5mAhg-1 after 100 cycles at 0.8-4.0V at 50mAg-1.
    No preview · Article · Nov 2015 · Applied Surface Science
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    ABSTRACT: Wearable energy storage devices that can be used in the garment industry are strongly required to power E-textiles. In this article, polypyrrole (PPy) nanorods were deposited on cotton fabrics via in situ polymerization of pyrrole in the presence of the fibrillar complex of FeCl3 and methyl orange as a reactive self-degraded template. The obtained fabrics could be directly used as supercapacitor electrodes, with a maximum specific capacitance of 325 F g-1 and an energy density of 24.7 Wh kg-1 at a current density of 0.6 mA cm-2. The capacitance remained higher than 200 F g-1 after 500 cycles.
    Full-text · Article · Nov 2015 · Organic Electronics
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    ABSTRACT: Highly hydrophobic silk fabric surfaces were successfully fabricated using a simple one-step atomic layer deposition (ALD) process. The surface morphology, chemical composition, and structure of bare silk fabric and silk fabrics coated with titanium dioxide (TiO2) subjected to 800 and 1600 ALD cycles were measured using scanning electron microscopy (SEM), field-emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), and scanning probe microscopy (SPM). The surface wettability of the silk fabrics was evaluated by determining their static water contact angles (WCAs) and roll-off angles. The results suggest that the good hydrophilicity of the surfaces of bare silk fabrics can be changed to high hydrophobicity by the application of TiO2 nanoparticles to their surfaces using ALD. The high hydrophobicity achieved can be attributed to the increase in roughness of the silk fabric surface. The laundering durability of TiO2-coated silk fabrics is greatly improved by increasing the thickness of the ALD TiO2 films.
    Full-text · Article · Oct 2015 · Applied Surface Science
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    ABSTRACT: Flexible and wearable energy storage devices are strongly demanded to power smart textiles. Herein, reduced graphene oxide (RGO) and polypyrrole (PPy) were deposited on cotton fabric via thermal reduction of GO and chemical polymerization of pyrrole to prepare textile-based electrodes for supercapacitor application. The obtained PPy–RGO-fabric retained good flexibility of textile and was highly conductive, with the conductivity of 1.2 S cm−1. The PPy–RGO-fabric supercapacitor showed a specific capacitance of 336 F g−1 and an energy density of 21.1 Wh kg−1 at a current density of 0.6 mA cm−2. The RGO sheets served as conductor and framework under the PPy layer, which could facilitate electron transfer between RGO and PPy and restrict the swelling and shrinking of PPy, thus resulting in improved electrochemical properties respect to the PPy-fabric device.
    No preview · Article · Sep 2015 · Organic Electronics
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    ABSTRACT: In this study, silk fiber was successfully modified via the application of a nanoscale titania coating using atomic layer deposition (ALD), with titanium tetraisopropoxide (TIP) and water as precursors at 100 °C. Scanning electron microscopy, X-ray energy dispersive spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscope, and field emission scanning electron microscope results demonstrated that uniform and conformal titania coatings were deposited onto the silk fiber. The thermal and mechanical properties of the TiO2 silk fiber were then investigated. The results showed that the thermal stability and mechanical properties of this material were superior to those of the uncoated substance. Furthermore, the titania ALD process provided the silk fiber with excellent protection against UV radiation. Specifically, the TiO2-coated silk fibers exhibited significant increases in UV absorbance, considerably less yellowing, and greatly enhanced mechanical properties compared with the uncoated silk fiber after UV exposure.
    No preview · Article · Sep 2015 · ACS Applied Materials & Interfaces
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    ABSTRACT: Xanthan-based hydrogels can be used for encapsulating and controlling release of nutrition ingredients, therapeutic agents, and cells in food and tissue engineering applications. Hydroxyl groups on the xanthan gum (XG) chains permitted the formation of the hydrogels through crosslinking XG with sodium trimetaphosphate (STMP). Dynamical oscillation tests were performed to monitor the in situ crosslinking process, and to evaluate the forming kinetics and mechanical stability for the XG-STMP hydrogels. The results indicated that the transition from hydrogen bonding to chemical crosslinking for the XG chains occurred and reached a balance approximately at 25 and 37 °C, respectively. The XG-STMP hydrogel networks with solid-like gel behavior exhibited more elastic and tougher to resist the deformation than the physical XG hydrogels. The XG-STMP hydrogels with porous and interconnected structure displayed good swelling and release-controlled properties. This work provides some valuable and fundamental information of the xanthan-based hydrogels for further application in biomaterials, medical and food engineering.
    No preview · Article · Sep 2015 · Food Hydrocolloids
  • Genyang Cao · Dan Sheng · Weilin Xu · Xin Wang
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    ABSTRACT: In this study, 2-phenoxyethanol was used as a carrier to realise the bright-colour dyeing of aramid fibre. Fourier transform infrared, X-ray diffraction, and thermal analyses were used to characterise the modification of 2-phenoxyethanol on the aramid fibre structure. The dyeing performance, including the K/S value and the dye uptake, was tested by varying the concentration of 2-phenoxyethanol and related experimental parameters. Structural analysis suggests strengthened H-bonds, lower crystallinity, and slightly lower thermal stability after 2-phenoxyethanol treatment, which can be explained by the swelling effect of 2-phenoxyethanol, enlarging the amorphous structure through the reassembly of hydroxyl bonding to the aramid fibre. The dyeing performance can be improved by increasing the dyeing time, the temperature, and the concentration of sodium nitrate under slightly acidic condition. Colour fastness tests showed that 2-phenoxyethanol treatment does not affect the rubbing fastness but lowers the wash fastness slightly. Dyeing of aramid is crucial under special environmental conditions in which the products must withstand a harsh environment while retaining a bright colour.
    No preview · Article · Sep 2015 · Coloration Technology
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    ABSTRACT: Wool, cotton and ramie thermal properties are qualitatively studied by temperature-dependent Fourier transform infrared (TD-FTIR) spectroscopy, and quantitatively investigated by thermogravimetry coupled with a differential thermal analyzer (TG-DSC). TD-FTIR results indicate that although cotton, ramie and wool exhibit significant water loss, they have no detected degradation within the temperature range from 25℃ to 210℃. These data are confirmed by TG-DSC analysis. Dynamic mechanical thermal analysis provides comparative study of cotton, ramie and wool bundles’ dynamic mechanical thermal properties. The four-fiber-bundle has a much lower storage modulus due to its larger fiber contact surface and twisting deformation; heating reduces the storage modulus significantly for cotton and ramie instead of wool fiber bundles in the temperature range from 25℃ to 100℃. Key E′-T and tan δ-T curve information reveals that ramie fiber bundles have the strongest temperature sensitivity, while wool fiber bundles express the weakest temperature sensitivity.
    No preview · Article · Aug 2015 · Textile Research Journal
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    ABSTRACT: Carboxymethyl chitosan fiber (CMCF) was successfully prepared and characterized by FTIR. The swelling behavior, mechanical property, antibacterial activity and indirect cytotoxicity assessment of CMCF were also studied, respectively. The results showed that, CMCF had higher liquid absorption capacity and lower tensile strength and elongation at break than those of chitosan fiber. The antibacterial activity of CMCF was similar with chitosan fiber, and carboxymethylation did not enhance the antibacterial activity directly. Indirect cytotoxicity assessment of the fibers indicated that CMCF was nontoxic to the L929 cell with relatively low extraction concentration. This novel fiber would be used as a potential wound dressing for skin regeneration.
    No preview · Article · May 2015 · Journal of Natural Fibers

Publication Stats

1k Citations
372.22 Total Impact Points

Institutions

  • 2008-2016
    • Wuhan Textile University
      Wu-han-shih, Hubei, China
    • University of Texas at Austin
      Austin, Texas, United States
  • 2009-2012
    • Donghua University
      • College of Textile
      Shanghai, Shanghai Shi, China
  • 2006-2010
    • Wuhan University of Science and Technology
      Wu-han-shih, Hubei, China
  • 2008-2009
    • Government of the People's Republic of China
      Peping, Beijing, China
  • 2001-2006
    • Wuhan Institute of Technology
      Wu-han-shih, Hubei, China