Abstract
Hydration reaction characteristics in a composite of calcium chloride and of silica microcapsules with holes have been investigated. Silica hollow microcapsules with holes with the diameter of 19.1 μm were fabricated by a double emulsion method and calcium chloride was installed inside the capsules. The including rate of calcium chloride in the capsules was 0.20. The observation of Silica hollow microcapsules by the scanning electron microscope was also performed. From the observation, the thickness of outer shell of microcapsules was 0.75 μm. From the results of hydration reaction experiments, it was found that the reaction rate is higher than that of the composite of calcium chloride and of expanded graphite. This was caused due to the high thermal conductivity of the present composite. It was also found that reacted water per volume is 2,000 times larger than the expanded graphite because the present capsules contains large amount of calcium chloride. Thus, the present composite is a promising item for realizing the chemical heat pumps.
