Papers by Author: Xiao Liang Wang

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Authors: Xiao Min Wang, Xu Dong Li, Gui Qiu Zheng, Xiao Liang Wang, Xing Dong Zhang, Zhong Wei Gu
Abstract: Poly(vinyl alcohol) (PVA) was introduced during in situ synthesis of hydroxyapatite (HA) in neutral collagen (COL) solution and final PVA-COL-HA nanohybrids were achieved via sequential steps including gelation by fibrillogenesis, freezing-thawing physical crosslinking, removal of unreacted residues and dehydration. This method is expected to endow the pure PVA with good bioactivity and meanwhile the presence of elastic PVA would improve the properties of COL-HA composites. The phase, microstructure and possible molecular interactions of the achieved PVA-COL-HA nanohybrids were analyzed by using X-ray diffraction, Fourier transform infra-red spectroscopy and scanning electron microscopy. The results indicate that the inorganic phase is poorly crystallized apatite with a nanometer size due to the confinement of organic macromolecules which forms a network structure.
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Authors: Xiao Liang Wang, Xu Dong Li, Xiao Min Wang, Jian Lu, Hui Chuan Zhao, Xing Dong Zhang, Zhong Wei Gu
Abstract: Collagen (Col) and chitosan (Chi) are both natural polymers and have received extensive investigation in recent years in the field of tissue engineering, but there are few reports on the introduction of hydroxyapatite (HA) into the Col-Ch system. In this study, based on the miscibility of these two polymers under proper condition, hydroxyapatite (HA) was synthesis in the Col-Chi system by in-situ co-precipitate method to give rise to a novel nanocomposite. The structural characterization of such Col-Ch-HA nano-materials was carried out by using FT-IR, XRD, SEM and TGA analyses with main components and Col-Chi samples used for comparison. It was found that there exist interactions between Col and Chi molecules. The nucleation and growth of inorganic phase occurs in the Col-Chi system and final products are uniform dispersion of nano-sized HA in the Col-Chi network without obvious phase separation. This novel nanocomposite would be a promising material for bone tissue engineering.
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Authors: Zhe Zhang, Xiao Liang Wang, Jian Xu, Heng Chang Ma, Zi Qiang Lei
Abstract: The present work describes an ultrasonic assisted in-situ dynamic inverse emulsion polymerization process of aniline (ANI) in the presence of organic palygorskite (OPGS) in toluene. Core-shell structure of electrically conducting polymerized ANI (PANI) combined with OPGS was prepared by utilizing the method. Dodecylbenzenesulfonic acid (DBSA) was used as the dopant and emulsifier. The OPGS was obtained via the chemical reaction of pretreated palygorskite with hexadecyltrimethyl ammonium bromide (HTAB). The prepared PANI/OPGS composite was characterized by FT-IR, UV-Vis, XRD, TGA and SEM. In addition, the conductivity was evaluated at different ANI/OPGS weight ratio. When the ANI/OPGS weight ratio increased to 2:7, the conductivity of the composite still remained at 10 S/m at room temperature. The results demonstrated that ultrasonic assisted dynamic inverse emulsion would be an excellent polymerization technique to increase the conductivity and the polymerization rate.
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