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KMID : 0604520130390010055
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Journal of the Society of Cosmetic Scientists of Korea
2013 Volume.39 No. 1 p.55 ~ p.63
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Stability of Nano-emulsions prepared upon Change of Composition
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Cho Wan-Goo
Kim Eun-Hee
Jeon Bong-Ju
Cha Young-Kweon
Park Seon-Ki
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Abstract
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Applications of nano-emulsion for cosmetics as a means of promoting dermal absorption have been the subject of interest. In this study, the stability of nano-emulsions prepared by low-energy emulsification method and varying the composition of raw materials was investigated. By measuring the particle size of the nano-emulsion against time, the stability of nano-emulsions prepared by adding polyol to water phase was increased significantly compared with the nano-emulsions prepared by adding polyol to ethanol phase. The speed of adding ethanol phase to water phase did not have a significant impact on the particle size and stability. Depending on the type of oil, stability was not affected. However, there would be a correlation between the initial size of the nano-emulsion droplets and the molecular weight and polarity of the oil. Stability and the initial particle size according to the type of polyols showed a similar trend except 1,2 hexanediol. The initial droplet size was affected by the concentration of surfactant and oil. However, the initial droplet size did not change against time. Concentration of ethanol was observed to have a significant impact on the initial particle size and stability.
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KEYWORD
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nanoemulsions, manufacturing process, self-emulsification, stability
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