Microencapsulation of a salt hydrate phase change material by resorcinol formaldehyde through electrohydrodynamic disintegration of coaxially layered filament

Abstract

Uniform microcapsules of size on the order of 100 nm with CaCl2.6H2O at the core and resorcinol formaldehyde as the shell was made by electro hydrodynamically disintegrating the coaxially layered filament. The shell thickness was varied by changing the flow ratio. The effect of shell thickness on the phase change temperature and the heat flow at its peak value during the DSC scan were reviewed to ascertain the extent of thermal equilibration, and the fraction of PCM melting at the peak value of heat flow. The integrity of the shell was evaluated by sustained dipping in deionized water for a month. The DSC scan was repeated after several heating-cooling cycles to understand the cycle life of the microcapsules.