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KMID : 0604520140400020133
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Journal of the Society of Cosmetic Scientists of Korea
2014 Volume.40 No. 2 p.133 ~ p.139
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Stable Liquid Paraffin-in-Water Nanoemulsions Prepared by Phase Inversion Composition Method
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Kim Eun-Hee
Cho Wan-Goo
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Abstract
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Oil-in-water nanoemulsions were prepared in the system of water/Span 80?Tween 80/long-chain paraffin oilvia the PIC (phase inversion composition) method. With the increase of preparation temperature from 30 ℃ to 80 ℃,the diameter of emulsion droplets decreased from 120 nm to 40 nm, proving the formation of nanoemulsions. By varyingthe HLB (hydrophilic lipophilic balance) of mixed surfactants, we found that there was an optimum HLB around 12.0~ 13.0 corresponding to the minimum droplet size. The viscosity of nanoemulsions clearly increased with droplet volumefraction, f, but the droplet size slightly increased. Significantly, at ? ≤ 0.3, the size distribution of nanoemulsions keptconstant more than 2 months. These results proved that the viscous paraffin oil can hardly be dispersed by the PICmethod at 30 ℃, but the increase in preparation temperature makes it possible for producing monodispersenanoemulsions. Once the nanoemulsion is produced, the stability against Ostwald ripening is outstanding due to the extremelylow solubility of the liquid paraffin oil in the continuous phase. The highly stable nanoemulsions are of greatimportance in cosmetic applications.
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KEYWORD
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Liquid paraffin, Nanoemulsion, PIC, Ostwald ripening, Cosmetics
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