Abstract
Silica sol–gel reaction is studied based on a freeze-casting method. The effects of freezing temperature on the reaction and the microstructure of the resulted gels are characterized using SEM, DSC and IR techniques. The reaction mechanism induced by compaction pressure of ice crystals during the freezing process is explored by gel reaction kinetics analysis. The results demonstrate that the compressive strength of the frozen gels increases with the decrease of the freezing temperature.
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