Journal
CERAMICS INTERNATIONAL
Volume 40, Issue 3, Pages 4415-4420Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.08.113
Keywords
Porosity; SiO2; Functional applications; Chemical preparations
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This study presents a novel approach for the synthesis of porous calcium silicate hydrate (CSH) at a low hydrothermal temperature of 110 C based on enhanced reactivity SiO2 (i.e. silica/polyethylene glycol (PEG(2000)) composites) as the source silica material. The as-prepared CSH materials exhibited a porous microstructure with a large number of small mesopores. The porosity formation mechanism of CSH was apparent that cavitation, resulting from sonication, enabled PEG2000 (via intercalation on silica) to break apart Si-O-Si structural units, thereby enhancing SiO2 reactivity at a low hydrothermal temperature. In addition, the presence of PEG2000 effectively prevented the aggregation of particles during the formation process of the porous CSH solid. The low temperature synthesis proposed herein represents a viable and effective method for the further development of porous CSH as a functional ceramic material. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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