Dynamic Wettability of Superhydrophilic TiO2 and TiO2 SiO2 Surfaces

Abstract

Abstract: The dynamic wetting of water spreading on TiO₂ and TiO₂ SiO₂ films prepared by sol gel method and subsequently treated by air plasma and UV irradiation was investigated. Water completely spread on TiO₂ surface within 3 s and its dynamic contact angles can be expressed by a power law θ_d= k(t+a)^-n with the n value 0.98. Less than 50%(molar fraction) SiO₂ addition can accelerate the dynamic water spreading rate on the TiO₂ SiO₂ films and the optimum molar fraction of SiO₂ amount corresponding to as annealed, air plasma, and UV irradiation treatment process is 15%, 10% and 20%, respectively.

Key words: TiO₂ film, SiO₂, Dynamic wetting, Superhydrophilic surface

CLC Number:

O647.11

TrendMD:

FENG Wen Hui, GUAN Zi Sheng, JIANG Feng Zhi, ZHANG Jin Biao, SONG Yan Lin, JIANG Lei. Dynamic Wettability of Superhydrophilic TiO₂ and TiO₂ SiO₂ Surfaces[J]. Chem. J. Chinese Universities, 2003, 24(4): 745.

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Dynamic Wettability of Superhydrophilic TiO₂ and TiO₂ SiO₂ Surfaces

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