PREPARATION OF MONODISPERSED W/O EMULSIONS BY SHIRASU-POROUS-GLASS FILTER EMULSIFICATION TECHNIQUE

The preparation of fine and monodispersed water-in-oil (W/O) emulsions by using the Shirasuporous-glass (SPG) filter emulsification technique with a copolymer type surfactant was investigated. W/O emulsions were prepared by two kinds of SPG filter emulsification techniques using batch and continuous methods. Highly monodispersed W/O emulsions were formed from this new technique and there was no difference in the size of the water droplets produced by these two methods. The dispersion stability of W/O emulsions prepared by this technique with a concentration of copolymer type surfactant above 7.5 wt% was extremely good. This remarkable stability was ascribed to the low interfacial tension in addition to the formation of a viscoelastic adsorbed film of copolymer type surfactants on the water droplets.