Microencapsulation through thermal sintering Pickering emulsion-based colloidosomes
Microcapsules of phase change material by thermally sintering Pickering emulsion-based colloidosomes were demonstrated. The protocol including three steps: ①Monodispersive poly(glycidyl methacrylate) (PGMA) microspheres were prepared by dispersive polymerization and endowed with a contact angle of 63.4° for oil-in-water Pickering stabilization by hydrolysis; ②By phase separation during Pickering emulsion polymerization, microcapsules with a structure of single PCM core and PGMA armored polystyrene shell were fabricated; ③A thermal sintering was followed to fume the polystyrene and PGMA microspheres into an integral shell of microcapsules. Durability of microcapsules before and after sintering was investigated by suspension test (in water and ethanol) and accelerated thermal cycling test. The sintering reduced the percentage of leaked dodecanol from 19.6% to 10.3% in suspension test in ethanol and from 10.4% to 2.8% in accelerated cycling test. These results verified that the sintering process endowed the prepared microcapsules with better tightness and durability.