Sintered Silica Colloidal Crystals with Fully Hydroxylated Surfaces

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• 作者：Thai Van Le ; Eric E. Ross ; Tomika R. C. Velarde ; Michael A. Legg ; Mary J. Wirth
• 刊名：Langmuir
• 出版年：2007
• 出版时间：July 31, 2007
• 年：2007
• 卷：23
• 期：16
• 页码：8554 - 8559
• 全文大小：658K
• 年卷期：v.23,no.16(July 31, 2007)
• ISSN：1520-5827

文摘

Silica colloidal crystals require multiple processing steps before they are useful materials in analytical applications,such as chemical separations, microarrays, sensors, and total internal reflection microscopy. These chemical processingsteps include calcination, sintering, surface rehydroxylation, and chemical modification, but these steps have not beenfully characterized for colloidal crystals. Silica particles of nominally 200 nm in diameter were prepared, and FTIR,SEM, UV-visible spectroscopy, and refractive index measurements were used to study the changes in chemicalcomposition, particle size, and particle density throughout the process. The final material is shown to be a durable,crack-free crystal of solid particles bearing a fully hydroxylated surface of silanols, which can then be chemicallymodified.