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Effect of Aqueous Phase Composition on the Properties of a Silica-Stabilized W/O Emulsion

✍ Scribed by B.R Midmore

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
554 KB
Volume
213
Category
Article
ISSN
0021-9797

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✦ Synopsis

A high volume fraction silica stabilized w/o emulsion with small droplet size (Ο·3 m) has been prepared using a commercially available hydrophobic silica. Addition of hydroxypropyl cellulose to the dispersed aqueous phase was found to improve the monodispersity of the emulsion by suppressing the production of larger droplets. The droplet size distribution showed complex behavior as the silica concentration was varied, which was explained using a simple kinetic argument. The effect of varying the acidity and ionic strength of the internal water phase was investigated. It was found that the presence of strong acid or strong alkali in the internal aqueous phase increased the gelation of the emulsions by promoting flocculation. This could be explained by acid-and alkali-catalyzed cleavage of surface siloxane groups increasing the number of surface silanol groups. If emulsions of strong acid and strong alkali were mixed, substantial additional gelation (again caused by flocculation) occurred. A possible explanation, preferred by the author, was an electrostatic one involving the interaction of dipoles in close proximity in the flocculated emulsion.

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