Improvement of Preparation Method of UV-protecting Suspensions by the Use of Rheological Techniques
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概要
- 論文の詳細を見る
Fine particles of titanium dioxide (TiO2) are effective UV-protecting inorganic materials in cosmetic products. The particles have the tendency to make flocs in liquids and the ability of UV light scattering of the suspensions strongly depends on the size of flocs. The degree of flocculation should be related to the rheological properties, and UV-protecting ability of the suspensions was investigated as a function of the size of flocs formed in a dispersion procedure during sample preparation. Essential requirements for UV-protecting cosmetics are strong cut-off ability for the UV light and high transparence for the visible light. Excellent balance of these optical properties was achieved in the suspensions of TiO2 particles with floc diameters ranging from 100 to 120 nm. When the floc diameter was decreased less than 100 nm in the dispersion procedure, the suspensions turned to shear-thinning fluids from Newtonian ones. Such the change in rheological behavior can be used to obtain TiO2 suspensions possessing the designed UV-protecting ability and flow behavior.
- 2009-02-15
著者
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Nasu Akio
Material Science Research Center Shiseido Co. Ltd.
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Otsubo Yasufumi
Chiba Univ. Chiba‐shi Jpn
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Otsubo Yasufumi
Department Of Urban Environment System Chiba University
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