鈥淟iquid-Phase Calcination鈥?of Colloidal Mesoporous Silica Nanoparticles in High-Boiling Solvents

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• 作者：Valentina Cauda ; Christian Argyo ; Davin G. Piercey ; Thomas Bein
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：May 4, 2011
• 年：2011
• 卷：133
• 期：17
• 页码：6484-6486
• 全文大小：707K
• 年卷期：v.133,no.17(May 4, 2011)
• ISSN：1520-5126

文摘

We report on a novel high temperature liquid phase 鈥渃alcination鈥?method with trioctylphosphine oxide (TOPO), tri-n-octylamine (TOA), and squalene for removing the template and strengthening the silica network in colloidal mesoporous silica (CMS) nanoparticles. For such materials, the common calcination procedure in air would result in strong agglomeration, thus preventing their use in colloidal suspensions. The highest efficiency of the new approach is obtained by thermal calcination in TOPO at only 275 掳C, as shown by an increasing degree of silica condensation, and the retention of the high colloidal stability of the CMS nanoparticles. Moreover, we also show the ability of the TOPO treatment to remove the template, thus saving a preparation step. The resulting CMS nanoparticles retain the ordered mesostructure, high porosity, and large surface area of the original mesoporous nanoparticles, while showing a much greater degree of silica condensation and high stability. The concept of 鈥渓iquid calcination鈥?represents a powerful general approach for the preparation of stable colloidal porous nanoparticles.