Synthesis and Characterization of Silica-Copper Oxide Composite Derived from Microemulsion Processing

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• 作者：K. Zhang ; C. H. Chew ; G. Q. Xu ; J. Wang ; and L. M. Gan
• 刊名：Langmuir
• 出版年：1999
• 出版时间：April 27, 1999
• 年：1999
• 卷：15
• 期：9
• 页码：3056 - 3061
• 全文大小：163K
• 年卷期：v.15,no.9(April 27, 1999)
• ISSN：1520-5827

文摘

Silica-copper composite powders with high surface areas of about 200-400 m²/g have been successfullysynthesized by the controlled hydrolysis/polymerization of sodium metasilicate (Na₂SiO₃) and copper nitrate[Cu(NO₃)₂·3H₂O] via partial-microemulsion and double-microemulsion processes at 28 C. Each microemulsion system consists of sodium 1,4-bis(2-ethylhexyl) sulfosuccinate and sodium dodecyl sulfate,cyclohexane, and an aqueous solution of sodium metasilicate or copper nitrate. The partial-microemulsionmethod can produce silica-copper oxide composites consisting of nanoparticles ranging from 20 to 50 nmwith an uniform elemental distribution. The composites also exhibit a narrow distribution of mesopores(3-6 nm) having specific surface areas ranging from 320 to 370 m²/g. This partial-microemulsion processis very attractive because ultrafine powders of silica-copper oxide composites can be produced frominexpensive Na₂SiO₃ using relatively low amounts of organic solvent and surfactants. However, the roleof mixed anionic surfactants in the microemulsions affecting the formation of these nanocomposites is yetto be clarified.