Preparation of Monodispersed Silica-Cadmium Sulfide Composites
and Hollow Silica Spheres via Nonionic Reverse Microemulsion Route

Teng Fei, Tian Zhijian, Xiong Guoxing*, Yunpeng Xu, Liwu Lin
(Laboratory of Natural Gas Utilizations and Applied Catalysis, State Key Laboratory of Catalysis,
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, P.O. Box 110, Dalian 116023, China)

Abstract In this report, monodispersed CdS-SiO2 core-shell composites and hollow silica spheres of various dimensions ranging from nanometers to microns have been synthesized via a reverse microemulsion route. The products were characterized by TEM, SAED, XRD, N2 adsorption, XRF, etc. The study shows that the size of CdS/SiO2 composites and the thickness of hollow silica sphere can be easily controlled by altering the addition amount of reactants. The probable formation mechanism of the particle was also proposed. The CdS-SiO2 core-shell composites can be used to synthesize advanced functional materials through grafting other functional molecules on the surface of composites, and the hollow silica spheres can be used as useful microcapsules or novel supports of catalysts.
Key words Reverse microemulsion, CdS/SiO2 composites, Hollow spherical silica

　

CdS/SiO2复合颗粒及空心SiO2球的微乳法制备

滕 飞 田志坚 熊国兴* 汪哲明 徐云鹏 林励吾
(中国科学院大连化学物理研究所催化基础国家重点实验室 大连 116023)

摘要 采用反相微乳技术制备了CdS/SiO2纳米复合球(30～100nm)和微米球(～1.5m m)，并采用浓硝酸处理，得到了相应的空心SiO2球。用TEM及SAED、SEM、XRF、XRD、BET等手段对产品进行了表征。研究表明，只需通过改变反应物的加入量和加料顺序，就可以控制颗粒的尺寸和外壳层的厚度。
关键词 反相微乳液 CdS/SiO2复合球 空心SiO2球

滕飞 男，博士生，现从事纳米材料、纳米催化剂、微乳技术的研究。*联系人 E-mail:gxxiong@dicp.ac.cn

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