TITLE:
Preparation of Hollow Calcium Silicate Microparticles by Simple Emulsion
AUTHORS:
Eiichi Toorisaka, Syotaro Nagamatsu, Yasunobu Saruwatari, Makoto Hirata, Tadashi Hano
KEYWORDS:
Hollow Inorganic Microparticle, Water-in-Oil Emulsion, Solvent Extraction, Interfacial Reaction
JOURNAL NAME:
Journal of Encapsulation and Adsorption Sciences,
Vol.4 No.4,
November
12,
2014
ABSTRACT: Hollow calcium silicate microparticles were prepared by mixing a water-in-oil (W/O) emulsion containing silicate ions in aqueous phase with an oil phase containing a calcium/di-2-ethylhexyl phosphoric acid (D2EHPA) complex. The inorganic precipitation reaction at the oil-water interface was accelerated by using a simple W/O emulsion. Hollow microparticles were obtained when the mole ratio of D2EHPA and calcium in the oil phase was nearly 2:1. The shell formation of the par-ticles depended on the acceleration of the precipitation reaction, which could be accomplished by controlling the concentrations of the calcium and silicate ions.