Gui Shan Liu

Effects of Annealing in Different Atmosphere on the Near-Infrared Shielding Properties of CsxWO3 Particles

Using sodium tungstate and cesium carbonate as raw materials, cesium tungsten bronze (CsxWO3) powders were synthesized by low temperature hydrothermal reaction with citric acid as the reducing agent. Effects of annealing in different atmosphere on the near-infrared shielding properties of CsxWO3 were investigated. The microstructure of CsxWO3 powders was characterized by X-ray diffraction. The CsxWO3 films were prepared on glass using polyvinyl alcohol solution as film-forming agent, and the optical transmission properties of CsxWO3 films were investigated. The results indicate that the near-infrared shielding ability of samples after annealed at 200°C in the air atmosphere did not deteriorate apparently, but the 400°C-annealed samples in the air atmosphere showed apparent decrease of near-infrared shielding properties. Annealing in the carbon powder atmosphere had no apparent effects on the properties of CsxWO3 particles. As for the N2 annealing, the 500°C-annealed samples showed best improved near-infrared shielding as well as high transparency in the visible light region.

Effect of Composite Pore-Forming Agent on Performance of Light-Weight Thermal Insulation Materials

Production of porous and light-weight thermal insulation materials with reduced thermal conductivity and raised porosity were accomplished using sludge (SL) and sugar filter mud (SFM) as pore-forming agent respectively and composite pore-forming agent (CPFA) at different sintered temperature and holding time. The results of thermal insulation materials with flexural strength 7.65 MPa and thermal conductivity 0.056 W•m-1•K-1, obtained at 1000 °C for 0.5 h show that its the porosity factor raised to 40.60% and the bulk density of the materials decreased down to 1.265 g/cm3 using CPFA, closed porosity and dense structure in sample was observed by SEM

Effect of Cd2+ Concentration on the Structure and Properties of CBD-CdS

The CdS films were deposited on soda lime glass (SLG) substrate by Chemistry Bath Deposition (CBD). The influence of cadmium concentration on structure and properties of CdS films had been investigated. The phase compositions of the films were characterized by X-ray diffraction (XRD). The microstructure of the films was observed by Scanning Electron Microscope (SEM). The transmittance of the films was measured by Ultraviolet-visible Spectrophotometer. The results show that the cadmium concentration has great influence on Crystallite structure and grain size of the films. Under the condition of Cd2+ concentration of 0.006mol/L, the crystalline degree of the film is higher and the crystal growth is more remarkable, which help to make great progress on transmittance and optical band gap of the films.

Rapid Biomimetic Deposition of Drug-Loaded Apatite Coatings

In order to reduce the postoperative inflammation by the slow release of drugs at the beginning of implanting, drug-loaded apatite coatings and chitosan-apatite composite coatings on the NiTi alloy surface were prepared in the Simulated Body Fluid concentrated by five (5×SBF) under constant bubbling of carbon dioxide gas by biomimetic synthesis method. The composition and surface morphology of the coatings were studied using scanning electron microscopy (SEM) and X-ray diffraction (XRD). Additionally, a bacterial inhibition test was conducted for evaluating the drug slow release effects from the drug-loaded coatings. The results indicated that the porous apatite coatings with the flake structure could be deposited using the 5 times Simulated Body Fluid, and the drug-loaded chitosan-apatite composite coatings with better drug slow release effect were obtained. The incorporation of chitosan into the coatings could effectively control the drug release rate and was favorable for achieving better drug slow release effects.

Improved Corrosion Resistance of NiTi Alloy by Coated with TiO2-SiO2-HAP Composite Films

In order to further improve the corrosion resistance and bioactivity of NiTi alloy, TiO2-SiO2-HAP (hydroxyapatite) composite films with different composition were prepared on NiTi alloy substrate by a sol-gel method. The phase composition, surface morphology, interface adhesive strength and corrosion resistance were studied. The results indicated that the composite film heat-treated at 500°C showed amorphous state, and with increasing of heat-treatment temperature, crystals of CaSiO3, anatase TiO2 and hydroxyapatite (HAP) appeared. The composite film with higher (TiO2-SiO2) content was more uniform and smooth, and had higher interface adhesive strength with the substrate. With the decreasing of (TiO2-SiO2) content, the composite films tended to become irregular, and tiny crack clusters with ringy distribution appeared when the (Ti+Si)/Ca molar ratio was decreased to 25/75, which led to decrease of interface adhesive strength to some extent. The anodic polarization curves indicated that NiTi alloy coated with TiO2-SiO2-HAP composite films had an apparent improvement of corrosion resistance, with an obvious decrease of passivation current.

Preparation and Properties of ZnO/ZAO Double-Layers Thin Films on the Substrate of Glass

Aluminium zinc oxide(ZAO) thin films were deposited on soda-Lime-Silica glass substrate by middle frequency power magnetron sputtering. Then zinc oxide(ZnO) thin films were deposited above ZAO thin films by electrochemical deposition method at different time. ZAO thin films and ZnO/ZAO double-Layers thin films were characterized by X-Ray diffraction(XRD) and scanning electron microscope(SEM). A four-Point probe was used to determine the resistivity of the films. The optical transmittance of ZAO films and ZnO/ZAO films was measured by UV-Visible spectrum. The results represent that the transmittance of ZAO/ZnO thin films decreases gradually with deposition time increasing. When the deposition time is 5 minutes, the maximum transmittance of ZnO/ZAO films reaches to 85% at wave length from 400nm to 600nm, and the thickness and resistivity of thin film are 610nm and 2.04×10-3Ω•cm, respectively. However, the thickness and resistivity are highest when the deposition time is 20 minutes, which reaches to 808nm and 1.2×10-2Ω•cm. Meanwhile, the lattice constants a and c of ZAO/ZnO thin films demonstrate an expansion with deposition time increasing. In essence, good-Quality double-Layers thin films of ZnO/ZAO play an important role in CIGS solar cells.

Performance and Preparation of Porous Materials Using FGD Gypsum as Aggregate

Porous material with raised flexural strength 34.43 MPa and porosity 33.069% obtained at 1070 °C for 0.5 h, shows that its bulk density of the materials decreases down to 1.450 g/cm3 using FGD gypsum as aggregate. The closed porosity and dense structure of sample has been observed by SEM and the main crystalline phases of the sample using XRD techniques are quartz, mullite and anorthite. The calcium oxide from FGD gypsum decomposition helps to form the crystalline phase of anorthite and to improve the flexural strength of sample.

Research on the Insulation Materials with Sugar Filter Mud as Pore-Forming Agent and Jilin Clay as Aggregate

Insulation materials with flexural strength 5.238 MPa and porosity 39.24% obtained at 1050 °C for 0.5 h show that its bulk density of the materials decreased down to 1.252 g/cm3 using clay as aggregate. Due to change the amount of sugar filter mud, the porosity arises from 37.07% to 39.24% and the thermal conductivity decreases from 0.086 to 0.052 W·m-1·K-1. The clay and wastes were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and chemical elemental analysis. The main crystalline phases of sample observed by XRD are quartz, mullite and anorthite. The insulation materials were manufactured from clay and the optimal proportion of wastes.

Effect of Cu(Cr0.2Al0.8)2O4/TiO2 Composite Film Electrodes on DSSC Photoelectric Properties

Cu(Cr0.2Al0.8)2O4/TiO2 composite film electrodes were prepared on FTO glass substrate by screen printing method after Cu(Cr0.2Al0.8)2O4 nano-particles were doped in TiO2 powers. The characteristics were studied by the X-ray diffraction for the crystalline structure of composite films, UV-Vis diffuse reflectance spectrum instruction for absorption spectrum of composite films and dye sensitized solar cells tester for the performance of DSSC. The results show doping Cu(Cr0.2Al0.8)2O4 powers could enhance UV-Vis spectral absorption strength and improve the photoelectric conversion efficiency of the solar cells when the doping content of Cu(Cr0.2Al0.8)2O4 is 3％. Compared with pure TiO2 film electrodes, the photoelectric conversion efficiency of the solar cells reaches to 3.59％.

Effect of Substrate Temperature on One-Step Magnetron-Sputtered Cu(In,Ga)Se2 Thin Films for Solar Cells

CIGS thin films were deposited on soda lime glass by one-step magnetron sputtering using a single quaternary-CIGS target in stoichiometric proportions. The influences of substrate temperature on the structural, optical, and electrical properties of Cu(In,Ga)Se2 (CIGS) thin films were investigated. The phase structure of CIGS thin films was characterized by X-ray diffraction (XRD). The morphology and thickness of CIGS thin films were observed by Scanning Electron Microscope (SEM). The absorption coefficient of CIGS thin films was measured by Ultraviolet-visible Spectrophotometer. Four-point probe method was used to test the resistivity of CIGS thin films. Based on the results of characterization, the increase in crystallite size of CIGS was found to be significantly noticeable with increasing substrate temperature. UV-vis measurement analysis suggested that CIGS thin films deposited at different substrate temperatures had high absorption coefficient (~104 cm-1) and optical band gap (1.07-1.23 eV). The substrate temperature dependence of the resistivity of the films indicated that the resistivity of the films fall to about 0.5 Ω۰cm as the substrate glass was heated up to 300 °C.