Crystal Growth Observation of Tetrabutylphosphonium Acetate (TBPAce) Hydrate Suitable as Thermal Energy Storage Medium

Abstract

Formation and growth of tetrabutylphosphonium acetate (TBPAce) hydrate was observed. This study was performed at the mass fraction 0.35 and 0.42. The crystal growth was observed respectively at the subcooling temperature 3 K and 7 K. When the subcooling temperature was 3 K, the skeletal crystals were observed at both mass fractions. When the subcooling temperature was 7 K, the dendrite crystals were observed at both mass fractions.