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Yang X.,Donghua University | Fan L.,Deakin University | Ma L.,Donghua University | Wang Y.,Donghua University | And 7 more authors.
Materials and Design | Year: 2017

Wound dressing plays an irreplaceable role in preventing infection and accelerating healing of wounds, especially the chronic non-healing wounds. Recently, the electrospun silk fibroin (SF) fibrous matrices is regarded as an ideal candidate for wound healing in virtue of its excellent skin affinity and good permeability for air and water. Manuka honey (MH) has demonstrated its unique properties in wound healing, including anti-inflammatory and anti-bacterial function as well as promoting tissue growth and reducing pain of patients. Here we report the feasibility of developing MH/SF composite fibrous matrices as antimicrobial wound dressing. SF fibrous matrices loading different amount of MH were manufactured by green electrospinning. The FTIR spectra indicated that MH was successfully loaded into the SF fibers. The composite fibers show smooth morphology and their diameter increases with MH content increased. Interestingly, the incorporation of MH significantly improved the antimicrobial activity of SF fibrous matrices, without negative effect on the excellent biocompatibility of SF. Moreover, the MH/SF composite fibrous matrices showed good performance on improving wound healing according to the data of animal experiment. Our findings suggest as-prepared natural green composite matrices combining the merits of both SF and MH could be a promising candidate for wound dressing. © 2017 Elsevier Ltd

Zhang H.,Donghua University | Liu X.,Donghua University | Liu X.,Key Laboratory of Textile Science & Technology
Iranian Polymer Journal (English Edition) | Year: 2017

Photonic crystals play the vital role in structural color appearance, and they can be fabricated on polymer substrates. In this paper, monodispersed SiO2 microspheres with the average diameter ranging from 150 to 300 nm were prepared by classical Stöber method. The spherical size of SiO2 microspheres was regulated by controlling concentrations of ammonia. The tunable structural colors could be changed by modulating the diameters of SiO2 microspheres or viewing angles, which adhered to the law of the Bragg diffraction. As a kind of polymer fabric, the polyester fabrics, smoother than natural fiber fabrics, exhibited bright structural colors from the well-ordered photonic crystal microstructure by vertical deposition self-assembly of SiO2 photonic crystals. Moreover, the result indicated that the difference of fabric-woven structure could affect the lightness of structure color, and the lightness on satin fabric was duller than that of plain fabric. Besides, we have also discussed the influence of fabric structure on the lightness of structure color using the theory of thin film interference. It is believed that the structural color could provide a new strategy for related polymer product coloration without chemical dyes and pigments, and has a potential to reduce the pollution in related polymer materials dyeing and printing processes. © 2017, Iran Polymer and Petrochemical Institute.

Wang Z.,Donghua University | Liu B.,Donghua University | He J.,Donghua University | He J.,Key Laboratory of Textile Science & Technology
Journal of Industrial Textiles | Year: 2015

Bismuth vanadate-coated cotton fabric was synthesized by a chemical bath deposition method at low temperature (≤100℃) and characterized by using scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction and UV-V is diffuse reflectance spectroscopy. Its photocatalytic activities were evaluated by decomposition of C.I. reactive blue 19 in aqueous solution under visible light irradiation. The as-prepared composite possesses excellent photocatalytic activity for the degradation of liquid contamination especially in static system due to its large specific surface area. The reduction of total organic carbon (about 48.0% after 4 h of irradiation) showed that the mineralization of C.I. Reactive Blue 19 over the bismuth vanadate-coated cotton fabric is realizable. Moreover, the preparation of the composites is convenient for potential practical application. The formation mechanism of bismuth vanadate on the fabric was also discussed preliminarily. © The Author(s) 2013.

Jiang R.,Key Laboratory of Textile Science & Technology | Jiang R.,Donghua University | Hu J.,Key Laboratory of Textile Science & Technology | Yang X.,Key Laboratory of Textile Science & Technology | Ding X.,Key Laboratory of Textile Science & Technology
Fibers and Polymers | Year: 2016

Tactile textures of textiles depend on the non-linear friction vibrations which are generated by the fingertip sliding across textile surfaces. It is relatively difficult to understand these complex vibrations, since skin and textile are viscoelastic and their vibration spectra are too redundant. Currently, the method of handling such complex vibrations in the field of tactile evaluation and tactile rendering usually adopts Fourier analysis. Unfortunately, only Fourier analysis can neither trace the multi-scales surface textures nor delete the redundant information. This paper proposed a time-frequency analysis, which extends the recorded 1-D vibration signals to 2-D time-frequency spaces to realize the multi-scales decomposition and dimension reduction. By applying this method to four typical kinds of texture surfaces, such as grille and textiles, the results demonstrated that the time-frequency analysis can accurately capture the major textural features from friction-induced vibration signals and decrease the dimensionality of complex signals. Considering the merits of dimension reduction, the time-frequency analysis could use in the texture synthetic of tactile virtual rendering and the tactile design of textile products. © 2016, The Korean Fiber Society and Springer Science+Business Media Dordrecht.

Zhou J.,Donghua University | Wang J.,Donghua University | Wang J.,Key Laboratory of Textile Science & Technology
Journal of the Textile Institute | Year: 2015

Developing an efficient real-time detection algorithm is quite important for an automated inspection system. This paper presents a practical method based on local singular value decomposition (SVD) and normalised cross-correlation (NCC) for real-time defect detection in woven fabrics. As fabric-textured images exhibit high periodicity among the repeated sub-patterns, non-defective or normal image samples (image patches) can be efficiently approximated as a linear combination of the basis vectors (BVs) obtained via SVD. Since these BVs are recovered from normal samples, they will only capture the key structural features of the non-defective images. When using the BVs to model new samples, we can expect defective or abnormal samples with structural features not found in normal cases will incur substantial approximation errors. Therefore, complex defect detection can be converted to a template matching problem, where the robust NCC is utilised to measure disparities between the original and its approximation for defect identification. Experimental results on various real-world fabrics exhibit accurate defect detection with low false alarm rate, and we also conduct a comparison with a feature extraction-based method to further confirm the effectiveness of our algorithm. © 2014 The Textile Institute.

Zhang S.,Key Laboratory of Textile Science Technology | Li F.A.-X.,Donghua University | Yu J.-Y.,Donghua University
Cellulose Chemistry and Technology | Year: 2011

The coagulation properties of cellulose-NaOH/thiourea/urea/H 2O solutions under various coagulation conditions have been investigated, to determine the kinetics of this special coagulation process (known as including diffusion on the contact surfaces of the polymer solution with the precipitant and the chemical reaction between acid and alkali). The observation was made that, at the beginning of the coagulation process, thickness of the coagulated layer, ξ(t), is proportional to the square root of time, √ t, which agrees with Fick's law. By building a coagulation model, the influence of precipitant composition and concentration, of coagulation time, bath temperature and cellulose concentration on the coagulation rate has been demonstrated. The process of cellulose shaping from NaOH/thiourea/urea/H 2O solutions can be characterized by examining the thickness and surface morphology of the coagulated layer, which is a reliable and direct method for understanding and controlling the cellulose regeneration behavior. It was found out that the coagulation rate enhanced with the increase in coagulation temperature, and decreased with increasing cellulose concentration. The activation energy of coagulation was calculated to be of 10.808 KJ/mol. The kinetics of diffusion-controlled chemical reactions has been viewed as the mechanism of coagulation.

Zhou D.,Donghua University | Zhu Z.,Donghua University | Zhu Z.,Key Laboratory of Textile Science & Technology | Liu B.,Donghua University | Liu B.,Key Laboratory of Textile Science & Technology
Materials Letters | Year: 2016

A novel reduced graphene oxide (RGO)/BiVO4/SiO2 composites with high-efficiency visible-light photocatalytic activity were synthesized by a simple one-step solvothermal method at 180 °C for 4 h. The as-prepared RGO/BiVO4/SiO2 hybrid material was characterized by X-ray powder diffraction (XRD), high resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS) and UV–vis diffuse reflectance spectrum (UV–vis DRS), respectively. The photocatalytic activity of samples was evaluated by the degradation behaviors of C.I. Reactive Blue 19 in aqueous solution under visible light irradiation at room temperature, which is much higher than that of the pure semiconductor materials BiVO4 and hybrid material BiVO4/SiO2. © 2016 Elsevier B.V.

Wang C.-E.,Donghua University | Wang C.-E.,Key Laboratory of Textile Science & Technology | Zhang P.-H.,Donghua University | Zhang P.-H.,Key Laboratory of Textile Science & Technology
Autex Research Journal | Year: 2016

Biodegradable intravascular stent has attracted more and more focus in recent years as an effective solution for angiostenosis. Ideal stents were expected to exhibit sufficient radial force to support the vascular wall, while suitable flexibility for the angioplasty. After vascular remodeling, stents should be degraded into small molecular and be eliminated from human body, causing no potential risk. In this paper, poly-p-dioxanone (PDO) monofilament was braided into net structure with four different braiding density, two of which exhibited sufficient radial force larger than 30 kPa, and three of which showed the bending rigidity within 11.7-88.1 N•mm2. The degradation behaviors of monofilaments and stents have been observed for 16 weeks. The findings obtained indicate that degradation first occurred in morphology region, which induced temporary increase of crystallinity, monofilament bending rigidity and stent mechanical properties. During this period, monofilament tends to be hard and brittle and lost its tensile properties. Then the crystalline region was degraded and stent mechanical properties decreased. All the results reveal that the PDO intravascular stents with braided structure were able to afford at least 10 weeks of sufficient support to the vascular wall. © AUTEX.

Lv T.-J.,Donghua University | Lv T.-J.,Key Laboratory of Textile Science & Technology | Long H.-R.,Donghua University | Long H.-R.,Key Laboratory of Textile Science & Technology
Textile Research Journal | Year: 2015

In this paper, based on Hessian invariant moments, a new approach for classification of fancy weft knitted stitch was proposed. The speeded up robust features (SURF) algorithm was used to identify fancy weft knitted samples including cable stitch and tuck stitch. Weft knitted stitch images generally contain many repeated features, wrong matches are easily encountered when the SURF algorithm is applied to match images. To resolve this problem, the inflection point of misjudgment was found out. The general regularity of faults and the key threshold were concluded by analyzing a number of classification experiments. The results show that wrong matches can be removed by locking the inflection point and feature matching of fancy weft knitted stitch is proved to be feasible for assigning an unknown image to one of a set of known texture classes. © The Author(s) 2014 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav

Han W.,Jiaxing University | Wang X.,Donghua University | Wang X.,Key Laboratory of Textile Science & Technology
Fibers and Polymers | Year: 2016

The characteristics of molten polymer plays a major role in fiber formation in the melt blowing (MB) process. In this paper, the Maxwell model and two kinds of the standard linear solid (SLS) models in the bead-viscoelastic element model are proposed for melt blown fiber formation simulation. The fiber diameter, velocity and stress are studied with these different constitutive equations of polymer. The trajectory path of fiber whipping is obtained using numerical simulation and compares with the actual fiber motion which is captured with a high-speed camera. The results present that the Standard Linear Solid Model (SLS) is better than Maxwell model to predict the melt blown fiber’s characteristics under the same air drawing conditions, including fiber diameter, velocity and stress. The whipping motion of the fiber also can be well expressed by SLS constitutive model. The mathematical model with SLS model provides a clear understanding on the mechanism of the formation of microfibers during melt blowing. © 2016, The Korean Fiber Society and Springer Science+Business Media Dordrecht.

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