Mesostructured fluorocarbon–silica hybrid materials with a low dielectric constant

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• 作者：Carlos Rodrí ; guez-Abreu ; Pablo M. Botta ; José ; Rivas ; Kenji Aramaki ; Manuel Arturo Ló ; pez Quintela
• 关键词：Fluorocarbon surfactant ; Mesostructured silica ; Small angle X-ray scattering ; Thermogravimetric analysis ; Dielectric behavior
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2007
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：1 May 2007
• 卷：298
• 期：3
• 页码：284-286
• 文件大小：195 K

摘要

The properties of a fluorocarbon–silica hybrid prepared by sol–gel hydrolytic polycondensation using a non-ionic fluorocarbon surfactant as a structure-directing agent are studied by small angle X-ray scattering, scanning electron microscopy, ²⁹Si MAS-NMR, thermogravimetric analysis and dielectric relaxation. The obtained hybrid material consists mainly of micron-sized spherical particles with an internal two-dimensional hexagonal (p6mm) nanostructure. The material is thermally stable (with a high proportion of fully cross-linked silica) and shows a very low dielectric constant (about 2.15), which can be interesting from the point of view of applications.