Abstract

CARDENAS, Antonio  and  CASTRO, Elizabeth. Breaking of multiple emulsions under osmotic pressure and the effect of w1/o relation. INCI [online]. 2003, vol.28, n.9, pp.534-538. ISSN 0378-1844.

Multiple emulsions of low dispersed phase, in which the internal phase (W1) was the concentrated phase, were made and their behavior under different osmotic pressure gradients and W1/O relations were studied. The behavior was followed by conductivity measurements, rheological measurements and microscopy. The microscopy results indicate a volumetric increase of the dispersed phase until it reaches a maximum, and then a decrease of the dispersed phase due to the breaking of the emulsion. The rheological measurements showed an initial increase in viscosity until it reached a maximum value, and finally a decrease towards the initial viscosity value. It was also observed that for smaller W1/O relations the breaking of the emulsion was slower.

Keywords : Multiple Emulsions ; Osmotic Gradient Controlled Release; Emulsion Rheology .