Abstract: The synthesis of SiO2 coated palmitic acid (PA) nanoparticles via one-step,low heating temperature solid-state chemical reaction is reported. Analytical results of Infrared spectroscopy and X-ray diffraction prove that the palmitic acid (PA) was coated with a layer of SiO2.Morphology of scanning electron microscopy suggests that the sample is comprised of sphere-like nanoparticals with average diameter about 200nm.The as-prepared sample has been studied with differential scanning calorimetry (DSC).The transformation temperatures is 51.9℃and the fusion enthalpy are 3.36×104J/mol.The result shows that the sample possesses reasonable thermal property as a phase change material for latent heat energy storage application.

Key words: solid-state reaction%fatty acid%phase transition materials%composite