Abstract
The aim of this work was to synthesize porous ceramic materials from the SiOC system by the sol-gel method and the subsequent pyrolysis. The usage of two types of precursors (siloxanes) was determined by Si/C ratio in starting materials. It allows us to control the size of the pores and specific surface area, which are crucial for the potential applications of the final product after thermal processing. Methyltrimethoxysilane and dimethyldiethoxysilane were mixed in three different molar ratios: 4:1, 2:1, and 1:1 to emphasize Si/C ratio impact on silicon oxycarbide glasses properties. Structure and microstructure were examined both for xerogels and obtained silicon oxycarbide materials. Brunauer-Emmett-Teller (BET) analysis was performed to confirm that obtained materials are porous and Si/C ratio in siloxanes precursors affects porosity and specific surface area. This kind of porous ceramics could be potentially applied as gas sensors in high temperatures, catalyst supports, filters, adsorbents, or advanced drug delivery systems.
Highlights
Porous ceramic materials have been successfully used in many industries, including thermal insulation materials [1,2], filters [3], membranes [4], adsorbents [5], catalyst supports [6], and materials for medicine [7]
It was decided to mix both reagents in three different proportions: 1:1, 2:1, and 4:1, to examine the influence of Si/C ratio in starting materials on structural and microstructural characterization and most important properties for final porous products
Porous ceramic silicon oxycarbide materials were prepared by the sol-gel method
Summary
Porous ceramic materials have been successfully used in many industries, including thermal insulation materials [1,2], filters [3], membranes [4], adsorbents [5], catalyst supports [6], and materials for medicine [7]. One of the traditional and simplest methods of obtaining porous ceramics is sintering of ceramic powders. This method is used to receive materials with low porosity in the order of 30% [8]. More sophisticated and modern methods, such as additive manufacturing and other rapid prototyping techniques, enable to obtain materials with precisely defined porosity and designed shape [9,10]. Porous ceramics can be received from preceramic polymers as starting precursors. This type of materials is classified as a Polymer Derived
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