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KMID : 0604520140400030227
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Journal of the Society of Cosmetic Scientists of Korea
2014 Volume.40 No. 3 p.227 ~ p.236
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A Study on Emulsion Stability of O/W and W/S Emulsion according to HLB of Emulsifier
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Yeon Jae-Young
Shin Bo-Ram
Kim Ta-Gon
Seo Jeong-Min
Lee Cheong-Hee
Lee Sang-Gil
Pyo Hyeong-Bae
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Abstract
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In this study, O/W and W/S emulsions were prepared by combining oils having different required hydrophilic lipophilic balance (HLB) values under the diverse conditions of HLB values composed of a hydrophilic surfactant and a lipophilic surfactant and their stability was investigated. Results showed that the higher the viscosity of O/W emulsions was as the lower the HLB value of emulsifier and emulsion particle showed a tendency to be a smaller and compact and stabler in centrifugal filtration. W/S emulsions also showed a similar tendency to be a smaller and compact as HLB values of emulsifier was higher and stabler in centrifugal filtration. However, the viscosity of W/S emulsion tended to get lower in HLB conditions of all emulsifiers as the time passed. This indicated that the emulsions had an unstable feature in long-term stability. In conclusion, the results showed opposite to the known theory that O/W emulsion is proper to be applied by nonionic surfactant with a high HLB value and W/S emulsion to be applied by nonionic surfactant with a low HLB value and provide useful information for the cosmetics research and related areas.
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KEYWORD
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HLB, emulsion stability, O/W emulsion, W/S emulsion, emulsifier
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