NEXAFS and FTIR-ATR investigation of the static and dynamic superhydrophobicity of functionalized titanium dioxide nanoparticle coatings

Journal of the Brazilian Chemical Society

Rajajeyaganthan Ramanathan¹  Daniel E. Weibel¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Química Porto Alegre RS ,Brazil

关键词: superhydrophobic;    titanium dioxide;    NEXAFS;    contact angle hysteresis;   

DOI  :  10.5935/0103-5053.20130134

来源: SciELO

【 摘 要 】

Superhydrophobic surfaces with static water contact angles higher or equal to 159º were fabricated using titanium dioxide nanoparticules and trimethoxypropyl silane (TMPSi) in aqueous or non-aqueous solvents. The superhydrophobic surface fabricated in aqueous solvent showed high contact angle hysteresis. On the other hand, the superhydrophobic surface fabricated in non-aqueous solvent showed low contact angle hysteresis and self-cleaning properties. The application of near edge X-ray absorption fine structure (NEXAFS) spectroscopy in surface analysis of superhydrophobic surface is demonstrated and justified with the help of Fourier transform infrared spectroscopy by attenuated total reflectance (FTIR-ATR). The present work highlights the importance of chemical heterogeneity of the surface on the final properties of a superhydrophobic surface. The self cleaning superhydrophobic surface is obtained only with a complete coverage of the surface with TMPSi in a non-aqueous solvent. This finding is supported by detailed NEXAFS and FTIR-ATR data.

【 授权许可】

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