Abstract
A simple method of synthesis for the macroporous SiOC spheroidal microparticles was developed. Preceramic polysiloxane macroporous microbeads were obtained by a one-step aqueous emulsion process involving poly(hydromethylsiloxane) (PHMS) with the addition of FeCl3·6H2O. Thermal treatment of these particles gave various SiOC materials depending on the pyrolysis temperature. Hierarchically porous spheroidal mezo-macroporous ceramers were obtained at 600 °C. Heating at 850–1000 °C gave SiOC ceramic spheroidal particles with about 60% open porosity. Ceramization at 1200–1400 °C led to the particles decorated with ceramic whiskers and wires. Heating at 1600 °C gave wires and spilled ceramic particles. These 1D ceramic structures were formed by a Vapor–Liquid–Solid (VLS) mechanism.
Highlights
Polymer-derived SiOC ceramics are a fast developing field of materials science with great perspectives for application in many areas of advanced technologies [1]
We have recently described a method for the generation of macroporous microspheroidal particles by a simple one-pot emulsion processing of linear siloxane polymer [17]
In this paper we report the ceramization of these beads to fabricate SiOC ceramic particles of nearly spherical shape having open macropores
Summary
Polymer-derived SiOC ceramics are a fast developing field of materials science with great perspectives for application in many areas of advanced technologies [1]. Among various structures of these materials, ceramic beads of micrometric sizes having opened macropores are very promising for many practical uses. SiOC ceramics have excellent chemical and thermal stability, high mechanical strength and very good biocompatibility. Macroporous beads prepared of various ceramic materials have potential as catalysts [2, 3], enzyme supports [4], microorganism carriers [5], refractory materials [6], absorbers and materials for chromatography [7, 8], sensors [9], materials for tissue engineering [10] and for other biomedical applications [11].
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