Photoinduced superhydrophilicity: a kinetic study of time dependent photoinduced contact angle changes on TiO2 surfaces.
作者： Philip S. Foran , Colin Boxall , Kieth R. Denison
DOI: 10.1021/LA3026649
关键词: Thin film 、 Superhydrophilicity 、 Kinetic energy 、 Wetting 、 Substrate (electronics) 、 Materials science 、 Analytical chemistry 、 Molecular physics 、 Contact angle 、 Micelle 、 Goniometer
摘要: Transparent TiO2 thin films were prepared on quartz substrates via a reverse micelle, sol–gel, spin-coating technique. The time dependence of the film photoinduced superhydrophilicity (PISH) was measured by goniometric observation contact angle, θ, sessile water drops at surfaces. In these measurements, substrate illuminated 315 nm light and sequentially applied range illumination times. Using model for wetting heterogeneous surfaces derived Israelachvili Gee, measurements used to calculate f2, fractional surface coverage adventitious contaminating organics (Israelachvili, J. N.; M. L. Contact angles chemically Langmuir1989, 5, 288). Extending this include Langmuir–Hinshelwood based kinetic analysis f2 as function allowed calculation an expected value θ immediately prior illumination, that is, illumi...
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