Papers by Author: Wei Chang Hao

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Authors: Feng Pan, Jun Ying Zhang, Hai Ying Liu, Tian Min Wang, Wei Chang Hao
Abstract: Ag nano-particles were deposited on the surface of TiO2 self-assembled films by photo-reduction of Ag+ solution. SPM, XPS and UV-Vis spectrophotometer were employed to characterize the microstructure and photo-catalytic performance of the films. An obvious enhancement of photo-catalytic activity had been observed. Since rutile had a lower optical band gap than anatase, a higher photo-catalytic efficiency improvement of rutile than that of anatase was obtained under the help of Ag nano-particles, which acted as electron acceptors.
Authors: Ping Dong, Ling Wei Yuan, Wei Chang Hao, Ya Yi Xia, Guo Zu Da, Tian Min Wang
Abstract: Nickel Titanium alloy has been used widely in clinical iatrology for years because of its unique shape memory capability, proper elasticity and considerable biocompatibility. But as an implanted material, its possible release of Ni ions which might cause toxic effect and its improvable biocompatibility draw attentions of researchers. In this study, chitosan/heparin multilayer is coated on NiTi shape memory alloy by electrostatic self-assemble method. Field emission scanning electron microscopy (FE-SEM), contact angle test is used to show its surface character; hemolysis test, dynamic clotting time experiment and platelet binding test are utilized to investigate the blood compatibility of the materials. The results reveal that the hydrophilic character of the coated one is better than the substrate, and blood compatibility of NiTi is improved by coating treatment.
Authors: Yi Du, Wei Chang Hao, Jun Ying Zhang, Tian Min Wang
Abstract: In this paper, nanostructure zinc oxide (ZnO) hexagonal rods arrays on ZnO granular films coated substrates were fabricated by a simple chemical solution method. The shapes and structures can be controlled by changing the reactants and experimental conditions. X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) equipped with energy dispersive spectrometer (EDS), and fluorescence spectrum were used to characterize the structures and luminescent properties. The best reacting condition has been discussed. Urea was found playing an important role in forming rods. The granular films acting as the seed films were proved.
Authors: Yang Xi, Wei Chang Hao, Dan Ni Wang, Tian Min Wang, Run Sheng Yu, Bao Yi Wang, Long Wei
Abstract: In this paper, a series of mesoporous silica particles with different pore diameters were fabricated using tetraethyl orthosilicate (TEOS) as the network precursor, hexadecyl trimethyl ammonium bromide (CTAB) as a structure directing agent and 1,3,5-Trimethylbenzene (TMB) as a pore enlarge reagent. Compared with SAXRD and BET, the PALS may not only show the mesoporous information but also provide the structure information of microporous.
Authors: Wei Chang Hao, Jun Ying Zhang, Hai Bing Feng, Tian Min Wang
Abstract: Quantum size ZnO colloids were prepared by sol-gel method and size of colloids together with the luminescence properties were changed by varying preparing time and temperature. The absorption onset and the maximum of fluorescence peak of the ZnO colloid have obvious shift in UV region and visible light region respectively. The relationship between luminescence properties and energy level splitting is discussed in detail based on the experimental results.
Authors: Chun Yang, Jun Ying Zhang, Hai Bing Feng, Wei Chang Hao, Tian Min Wang
Abstract: Y2O3:Eu3+ thin film was synthesized by sol-gel method with inorganic salt raw materials, and the crystal structure and luminescent properties were investigated. By adding organic additive to the sol, a homogeneous film with high luminescent intensity could be obtained by dip-coating technique on the surface of alumina sheet and quartz glass. Structures of the films were studied by XRD and SEM. The excitation spectra of the films showed a wide excitation peak from 200nm to 260nm, and the emission spectra had a strongest emission peak at 611nm which revealed a close relationship with the calcining temperature.
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