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Title

ENGINEERING INTERFACIAL PROPERTIES BY GEMINI ANIONIC SURFACTANT–CHITOSAN COMPLEXES TO IMPROVE STABILITY OF OIL-IN-WATER EMULSIONS

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Abstract

 INTRODUCTION: OIL-IN-WATER EMULSIONS (10% W/W N-TETRADECANE) WERE PREPARED AT PH1/4 5.7 BY USING, AS SURFACE ACTIVE AGENTS, ELECTROSTATICALLY FORMED COMPLEXES OF DIOCTYLSULFUSOCCINATE (DSS) AT A CONCENTRATION OF 1% (W/W) AND CHITOSAN (CH) IN A CONCENTRATION RANGE BETWEEN 0 AND 4% W/W. THE USE OF COMPLEXES IN EMULSIONS WITH A LOW CONCENTRATION OF CH (<2% W/W) RESULTED IN HIGHLY FLOCCULATED SYSTEMS; INSTEAD, WITH INCREASED LEVEL OF CH, THE EMULSIONS HAD A SMALLER AVERAGE DROPLET SIZE AND EXHIBITED GREATER STABILITY DURING STORAGE. EMULSIONS STABILISED BY DSS/CH COMPLEXES SHOWED NON-NEWTONIAN FLOW BEHAVIOR WITH PRONOUNCED SHEAR THINNING. AMONG ALL FORMULATIONS STUDIED NONE SHOWED A GEL-LIKE BEHAVIOR SINCE IN ALL CASES THE G (STORAGE MODULUS) WAS LOWER THAT G (LOSS MODULUS).

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