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KMID : 0604520070330020105
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Journal of the Society of Cosmetic Scientists of Korea
2007 Volume.33 No. 2 p.105 ~ p.110
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The Evaluation for Characteristics of Titanium Dioxide Dispersion in Aqeous Medium by Zeta Potential
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Lee Kang-Yen
Park Byung-Jun
Kim Joong-Koo
Zhoh Choon-Koo
Kim Bong-Nam
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Abstract
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The stability of titanium dioxide dispersion was evaluated by zeta () potential and we intended to apply it for improvement of dispersion stability. Both theories related to potential (electric double layer, electrophoresis, isoelectric point and electroosmosis) and a method to measure potential were explained in this study. The change in potential of dispersion was measured by means of Henry’s function of Helmholtz-Smoluchowski’s equation (H-S equation). The potentials of dispersion were negative in all measured pH values (), and absolute values of potentials of increased as pH values increased. dispersion was maintained in pH 8.0 and 9.0 respectively. From these results, we suggest that potentials have an effect on dispersion and absolute value of potentials played an important role in the stability of dispersion in aqeous medium.
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KEYWORD
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zeta () potential, colloidal stability, Helmholtz-Smoluchowski’s equation, electric double layer
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