Papers by Author: Jian Xu

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Authors: X.Y. Xu, Hui Zhao Zhang, Qiang Zhao, Yun Fa Chen, Jian Xu, D.P. Yu
Abstract: Large area well-aligned ZnO nanowire arrays have successfully been synthesized on an unconventional substrate: stainless-steel mesh at a low growth temperature of 400oC. The as-grown ZnO nanowires have uniform diameters about 20 nm and a strong UV peak was observed in photoluminescence spectra. The growth method provides a novel way to produce high quality ZnO nanowire arrays, and can be also used to direct the controllable growth of other nanomaterials.
Authors: Wei Shen Zhu, Shu Cai Li, R.H.C. Wong, K.T. Chau, Jian Xu
Authors: Zhi Jie Wang, Jing Hua Gong, Shu Guang Yang, Jing Hong Ma, Jian Xu
Abstract: Polyvinylpyrrolidone (PVP)/boehmite nanocomposites fibers were successfully prepared by electrospinning using boehmite sol containing PVP as the spinning solution. Several techniques, including Fourier transform infrared (FT-IR), thermal gravimetric analyzer (TGA) and field emission scanning electron microscopy (FE-SEM) were used to characterize their ingredients, thermal properties and morphology. The results showed that PVP concentration exhibited significant effect on the PVP/boehmite nanofibers morphology. With increasing PVP concentration, the morphology changed from beaded, beaded fiber to uniform fiber. These PVP/boehmite nanofibers can be used as good candidates for continuously preparing uniform and compact alumina nanofibers.
Authors: Peng Chao Liu, Jing Hong Ma, Jing Hua Gong, Jian Xu
Abstract: Alumina nanofibers were fabricated by single-spinneret electrospinning of aluminium nitrate (Al (NO3)3)/polyacrylonitrile (PAN) precursor solution, followed by sintering treatment. The Al (NO3)3/PAN composite fibers and sintered fibers were characterized by SEM, TG, FTIR and XRD. It is found that the obtained alumina nanofibers show porous external surfaces and hollow sections. Upon calcining the composite fibers at 1000 or 1300 oC, the nanofibers are consisted of α-phased crystalline grains. Sintering temperature plays an important role in controlling the morphology and crystal structure of the nanofibers. A mechanism based on Kirkendall Effect was proposed to explain the formation process of the hollow structure.
Authors: J. Moxom, Jian Xu, L.D. Hulett, David M. Schrader, G. Laricchia, B. Somieski
Authors: H. Men, M.C. Yang, Jian Xu
Authors: Chi Zhang, Hui Min Han, Peng Qu, Jing Xu, Ye Zhou, Jing Wang, Ning Zhao, Jian Xu
Abstract: A pH-sensitive semi-interpenetrating polymer network (semi-IPN) hydrogel based on Konjac glucomannan(KGM) and methylacrylic acid(MAA) was prepared by free radical polymerization at different concentrations of initiator potassium persulfate (KPS) in presence of crosslinker N,N-methylene-bis-acrylamide (MBA). The chemical structure and rheological properties of hydrogels were characterized by FT-IR and rheometry, respectively. In addition, the swelling behavior of the hydrogels were studied in buffer solution at different pHs.
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