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| 1 | Nanostructured Cadmium Sulfide:Sonochemical Synthesis,Optical Properties and Formation Process显示文摘Semiconductor CdS nanoparticles were synthesized by the sonochemical reduction of a mixed aqueous solution ofCdCl2, Na2S2O3 and (CH3)2CHOH in Ar atmosphere at room temperature. The results of a detailed investigationwith X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectrum and optical absorption spec-troscopy are reported. A clearly red shift of the absorption edge and a broad absorption band related to the surfacestates of nanoparticles have been observed in the optical absorption spectra with the increasing of CdS particle size.The mechanisms of the CdS nanoparticle formation and size growth during sonochemical irradiation were discussed.This convenient method is found to be an efficient way to produce other chalcogenides as well. | GuozhongWANG YewuWANG YuchuanZHANG YuchengWU GuanghaiLI LideZHANG | 2003 | Journal of Materials Science & Technology2003，19，3： | 2 |
| 2 | PREPARATION AND MICROSTRUCTURE CHARACTERIZATION OF Ni/TiO2 NANOCOMPOSITE显示文摘Homogeneous Ni2+-doped titania gel was synthesized by a sol-gel process, and the xerogel was then ob-tained through aging and drying, leading to the formation of Ni/TiO2 nanocomposite after heat treatment under a suitable reducing atmosphere. The resulting nanocomposite was characterized by TGA-DSC, TEM, XRD and BET methods. The results show that the structure and grain size of the nanocomposites could be manipulated by altering the heat-treatment conditions, and that the nanocomposite possesses a mesoporous structure with a pore radius of ca. 28 nm and a specific surface area of 49.1 m2.g-1. It is demonstrated that the nanosized Ni dispersion in the titania matrix significantly affects the anatase-rutile phase transformation. | YuchengWu XiaWu LideZhang | 2003 | China Particuology2003，1，6： | 1 |
| 3 | EFFECTS OF FINELY DISPERSED METALLIC PALLADIUM ON MICROSTRUCTURE AND PROPERTIES OF NANOCOMPOSITES PRODUCED BY SOL-GEL TECHNIQUE显示文摘Nanosized palladium particles were incorporated into mesoporous silica matrix to obtain nanocomposites using the sol-gel technique. Effects of the finely dispersed metallic palladium on the microstructure and properties of the nanocomposites were investigated. By means of X-ray diffraction and optical absorption, it was found that palladium particles were 5-9 nm in diameter and their uniform dispersion in the mesoporous silica depended on both the content of the palladium and the structural features of the silica matrix. The results showed that the mixing method of preparation led to wider size distribution of the nanosized particles as compared to the immersion method, but dispersed degree was reduced. Although the incorporation of nanosized palladium particles could not substantially induce significant structural changes of the matrix, the apparent red-shifted optical absorptions for the nanocomposites were observed as compared to the parent monolithic silica, particularly with increase in palladium loading and calcination temperature. | YuchengWu YongZhang LideZhang | 2004 | China Particuology2004，2，1： | 0 |
| 4 | PREPARATION AND PROPERTIES OF ULTRAFINE COMPOSITE POWDERS OF Fe_3O_4 AND Ni/MICA显示文摘This paper presents the preparation of ultrafine powders of Fe3O4 and Ni by a chemical method, followed by mixing the prepared powders with mica and other ultrafine powders for synthesizing microwave absorption coatings.The microwave attenuation rate of the coatings was measured by the Microwave Network Analyzer in the frequency range of 8-12 GHz at room temperature. The results indicate that microwave could be absorbed by the coatings with an effectiveness strongly dependent on the powder sort and content and the coating thickness. | YuchengWu JiaqinLiu RujunXue GuozhongWang LideZhang | 2005 | China Particuology2005，3，3： | 0 |
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