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KMID : 0984920130150010065
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Journal of Skin Barrier Research
2013 Volume.15 No. 1 p.65 ~ p.69
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Application of Rheological Theory to Assess Emulsion Stability and Physical Skincare Barrier
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Lee Weon-Ju
Park Chan-Ik
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Abstract
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Rheology is a study on the flow and deformation of a material when stress is applied on it. After this definition was accepted in 1929, the scope of the study has been greatly widened into biorheology, psychorheology and etc. In cosmetics industry, rheology has long been studied to control quality of products and to develop new vehicles for skincare. But most of studies have been limited within the boundary of simple application of viscosity for measuring consistency. In this study, firstly, we are to study the rheological properties of emulsion for the purpose of quality control in emulsified skincare products. We studied the mechanism of breaking the stability of emulsion in terms of coalescence, sedimentation, creaming and flocculation. Those phenomena can cause the separation or irregularity in emulsion products so that efficacy of products can be greatly damaged. Secondly, the physical skincare barrier concept should be considered by characterizing the visco-elastic properties of skincare emulsion when it is applied on skin. The physical skincare barrier which is skincare residue remaining on skin after application protects skin against dryness, environmental harms by forming short-term thin film on skin. This function can be controlled by regulating the rheological properties of skincare product to reinforce the intended function of the product such as physical UV protection or duration of moisturizing effect. In these ways, rheology can be usefully applied to research and development for skincare cosmetics.
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KEYWORD
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Rheology, Emulsion, Physical skincare barrier, Moisturizer
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