Ionic Character and Alkyl Chain Length of Surfactants Affect Titanium Dioxide Dispersion and Its UV-Blocking Efficacy
2024
Jaehun Mun | Yeji Jeon | Suhui Jeong | Jeong Min Lim | Yeojin Kim | Hwain Myeong | Jeongwoo Han | Youngwoo Choi | Seong-Min Jo | Seung Yun Yang | Beum-Soo An | Dae Youn Hwang | Sungbaek Seo
The dispersion of titanium dioxide (TiO<sub>2</sub>) determines the performance of TiO<sub>2</sub>-based formulations in cosmetic and coating applications. In particular, the chemical and structural characteristics of the surfactants used to prepare TiO<sub>2</sub> dispersions are significant. However, the influence of surfactants on TiO<sub>2</sub> dispersion quality has not been systematically investigated. In this study, we observed the effects of the ionic character of commercial surfactants on the dispersion stability and UV-blocking efficacy of TiO<sub>2</sub>. Among the experimental surfactant groups, anionic sodium dodecyl sulfate was efficient in stabilizing TiO<sub>2</sub> as a water-in-oil formulation and enhancing its UV-blocking efficacy. Furthermore, an anionic fatty acid as a surfactant with a longer alkyl chain length was sufficient to stabilize the TiO<sub>2</sub> formulation, which also displayed the highest UV-blocking efficacy, comparable to the values of commercial TiO<sub>2</sub>-based cosmetic products.
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