전단응력 하에서 에멀젼 상 변이의 측정을 위한 전기 유변학적 연구 Electro-rheological Measurements of Phase Inversion of Emulsions under Shear Flow

This study aims at measuring electrical and rheological properties of cosmetic emulsions on the skin under shear flow. The effects of volume ratio and surfactants on structural changes of emulsions were examined by determining the changes of electrical resistance, viscosity, and morphology. As the ratio of the internal phase increased, the phase inversion occurred more quickly. The viscosity change was found to increase with increasing of the variation of electrical resistance of the emulsions. This phenomenon may be caused by decreased resistant force against the shear flow because of the breakdown of the internal phase. Surfactants a]so played a key ro]e on phase transition of emulsions. It is likely that polymeric surfactants anchoring on the emulsion surface reinforced the interfacial mechanical strength. As the concentration of surfactants increased, the phase transition occurred more slowly. It has been demonstrated that the phase changes of emulsions under shear flow can be monitored on the real-time basis by using a JELLITM/ chip system, a combination of conductiometry and rheometry. Our approach is expected to a useful experimental tool for predicting the phase transition of the cosmetic products during skin application.
Publisher
Society of Cosmetic Scientists of Korea
Issue Date
2004
Language
English
Citation

Journal of the Society of Cosmetic Scientists of Korea, v.30, no.2, pp.147 - 151

URI
http://hdl.handle.net/10203/225533
Appears in Collection
MS-Journal Papers(저널논문)
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