Fabrication Process of Silica Hard-shell Microcapsule (HSMC) Containing Phase-change Materials

Abstract

A fabrication process via the double-emulsion method is proposed for silica hard-shell microcapsules (HSMCs) that contain trimethylolethane (TME) hydrate. The TME-encapsulating silica-HSMCs are promising materials for reusable phase-change materials for latent-heat transportation systems. The obtained silica-HSMCs were visualized by a scanning electron microscope. The amount of TME hydrate inside the capsules was confirmed using a differential scanning calorimeter. The measured latent heat of the TME-encapsulating silica-HSMC was a reasonable fit to the predicted value.

Fabrication of hard-shell microcapsules containing inorganic materials

“…reported the fabrication method of silica hard shell microcapsules containing paraffin. Toyoda et al (2014b) also reported that the fabrication of silica hard shell microcapsules containing trimethylolethane hydrates.…”

“…Such a silica shell has advantages in mechanical strength, in chemical stability and it has low adsorption characteristics onto the metal walls. Additionally, it can be applied to the high temperature latent heat transportation because its melting point locates over 600 o C. Toyoda et al (2014b) made the silica microcapsules from the porous hollow microcapsules. This technology indicates any materials with the phase change temperature of lower than 600 o C can be inserted into the microcapsules.…”

“…In this study, silica hard shell microcapsules (HSMCs) containing inorganic phase change materials have been fabricated as following the method reported by Toyoda et al (2014b). Toyoda et al (2014b) also reported that supercooling depression occurs in such a micro-encapsulated phase change material. Then, it is expected that the low supercooling inorganic phase change material can be realized with the present fabrication.…”

“…A similar procedure as reported in the previous study (Toyoda et al, 2014b) was adopted in order to make silica hard shell microcapsules (HSMCs). At first, porous hollow silica microcapsules was made by following the method reported by Virtudazo et al (2011) and Virtudazo et al (2014) using a double-emulsion system based on interfacial reactions, as shown in Fig.…”

Crystal Growth and Viscosity Behaviors of Ammonium Alum Hydrate Solution with PVA in Shear Flow

“…The adsorption force between a hydrate and substrate might be significantly lower when a substrate is hydrophilic. 31,32) Therefore, crystals generated on the substrate will be easily removed into the slurry, resulting in the generation of a new crystal on the substrate, before it detaches from the surface. Thus, the crystals cannot grow to large sizes on the hydrophilic substrate.…”