Papers by Author: Xiao Dong Shen

Abstract: Failure analysis of fracture of 35CrMo bolt was investigated. It was analyzed by means of morphology and microstructure analysis, chemical composition analysis, hydrogen content analysis, scanning electron microscope (SEM) micro-morphology of fracture surface, electronic differential system (EDS) corrosion products analysis. The results showed that the cause of fracture of 35CrMo bolt was stress corrosion cracking. Working stress of the bolt，H2S in surroundings and the high hardness of the bolt combined caused cracking of the bolt. Suitable heat treatment for the 35CrMo bolt is suggested.

Abstract: Paclitaxel-loaded microspheres with magnetic Fe3O4 nanoparticles were synthesized with albumin as carrier. The morphology was characterized by high-resolution transmission electron microscopy (HRTEM). The drug-loading rate and entrapment rate of the microspheres were researched by ultraviolet and visible spectrophotometer. The inhibition action of taxol microspheres to growth of esophagus cancer Eca109 cell were examined by MTT method. The result shows that it is regular spherical. The mean size and size distribution of microspheres are 275.6nm and 144.3nm by Zetasizer3000. The drug-loading rate is 3.013% and the entrapment rate is 35.26%. It has excellent target-orientation and sustained-release property which can prevent the growth of Eca109 cell.

Abstract: Cu₂O/Cu composite particles were successfully synthesized by a novel facile template-free chemical reduction route at room temperature. X-ray diffraction (XRD) results showed that the sample mainly consisted of the Cu₂O phase coexisting with a few Cu phases. Scanning electron microscopy (SEM) images indicated that the regular particles with a cubic shape about 2-3 μm is Cu₂O. In addition, the electrochemical behavior of the Cu₂O/Cu composite electrode and copper electrode during the charging and discharging process were both investigated. It was found that the first discharge capacity of Cu₂O/Cu composite electrode was up to 650 mAh•g^-1, which is much higher than the theoretical capacity of Cu₂O (about 375 mAh•g^-1). The additional capacity is attributed to the electrodeposition of lithium on pure copper, confirmed by the electrochemical property of copper as the anode material of the lithium-ion battery. The copper electrode presented a high discharge capacity of 280 mAh•g^-1 during the first cycle. However, a large irreversible capacity as same as the cuprous oxide electrode was observed during the first charging process. It is indicated that deposition of lithium on the Cu particle surface acts as a barrier preventing the contact between the Cu and the electrolyte. Furthermore, the Cu₂O/Cu composite electrode can exhibit reversible capacity of 210 mAh•g^-1 at a charge-discharge rate of 30 mA•g^-1 after 40 cycles.

Abstract: Citrate hydrolyzing method was used to prepare nano-LiAlO₂ powder, and the technological parameters were optimized by orthogonal experiment. The minimum size of LiAlO₂ powder was about 100nm, obtained when the green performs were sintered at 690°C for 2h, with the molar ratio of citric acid and metal-salt of 1:1 and concentration of Li⁺ of 0.5mol/L. XRD and SEM were used to examine the phase composition, particle size and microstructure. The LiAlO₂ powder had been agglomerated during the sintering process.

Abstract: Sn-In₂O₃ nanoparticles were synthesized by Sol-Gel method and dispersed steady Sn-In₂O₃ colloid solution was gained. Sn-In₂O₃ nanoparticles are body-center cube ferromanganese mine structure proved by XRD. And they are spheres and 15~25nm studied by HRTEM. The average size of nanoparticles is 21.7 nm with a narrow width 10.8nm measured by granularity instrument. Zeta potential is +33.4mV which means that there are very strong electrostatic repulsion to prevent the bird nesting of Sn-In₂O₃ nanoparticles.

Abstract: Silica-based aerogels doped with nano-ITO powder were synthesized using sol–gel process followed by supercritical drying. The main factors were studied including dosage of compling agent KH570 and ITO. The result shows that thermal radiation conductivity is 0.02659 W/(m•K) with ITO of 44.44% after 10 g ITO powder is modified with 1 mL KH570. The microstructure and physical characteristic of the SiO₂–ITO aerogels were characterized by FTIR, SEM, TG-DSC and BET. Their specific surface was in the range of 513–775m²/g and their average pore size was mainly 20 nm. Nano-ITO powders are physically embedded by SiO₂ aerogels.

Abstract: The electrochromic PANI film was prepared by emulsion polymerization with dodecyl benzene sulphonic acid (DBSA) as dopant and ammonium persulfate (APS) as initiator. Ultrasonic dispersion was adopted in the polymerization. The electrochemical properties, the surface morphology and structure of the prepared PANI film was characterized by means of Fourier Transform infrared spectroscopy (FT-IR), cyclic voltammograms (CV) and field emission scanning electron microscope (FE-SEM), respectively. The relationship between the morphology and properties of PANI film was detailedly discussed. The PANI film exhibited an excellent electrochromism with reversible color changes form yellow to purple. The PANI film also had quite good reaction kinetics with fast switching speed, and the response time for oxidation and reduction were 65 ms and 66 ms, respectively.