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KMID : 0604519960220020167
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Journal of the Society of Cosmetic Scientists of Korea
1996 Volume.22 No. 2 p.167 ~ p.173
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Study on the Evaluation of Stability of Gel Structured Cosmetics
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Park, Chan Ik
Kim, Ki Sun/Lee, Sung Jun/Yoon, Myeong Suk/Kang, Seh Hoon
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Abstract
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The stability of gel structured emulsion and the effect of studied by rheological property and interfacial tension.
In this paper, three types of gel structured emulsions were prepared by using three polyols respectively(glycerine for sample 1, 1.3 BG-for sample 2, PG for sample 3). And both complex modulus(G*) and loss angle[δ = tan-1(G"/G´)] of samples were investigated against oscillating shear stress and frequency(ω). The results show sample 1 is most highly consistent with oscillatig shear stress. And the results were compared with those of accelerated tests concerning storage stability of-gel structured emulsion. To correlate consistency of rheological property with storage stability, interfacial tension from which adsorption efficiency of surfactant(Octyldodecyl Ether) could be known was measured. Sample 1 showed the largest value of [dγ/dln_(Cconc. of sufactant)] in Gibbs equation.
In summary, the prediction of stability could be correctly made by the consistency of rheological property(G*,γ) of gel structured emulsion against oscillating shear stress and it could be supported by measuring interfacial tension. And polyol affected the value of [dγ/dlnC_(conc. of sufactant)], consequently affected the stability.
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