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A modified Wenzel model for hydrophobic behavior of nanostructured surfaces |
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| Authors: | Tao-Yun Han Chien-Te Hsieh |
| Affiliation: | a Department of Civil Engineering and Engineering Informatics, Chung-Hua University, Hsinchu 300, Taiwan b Graduate Institute of Construction Management, Chung-Hua University, Hsinchu 300, Taiwan c Department of Chemical Engineering and Materials Science/Fuel Cell Center, Yuan Ze University, Taoyuan 320, Taiwan |
| Abstract: | A modified Wenzel model was proposed to explore the influence of pore size distributions (PSDs) on water repellency of nanostructured surfaces. Rough surfaces with different porous structures, including surface areas and PSDs, were fabricated by stacking different solid ratios of TiO2 nanoparticles. These fluorinated surfaces exhibited an excellent hydrophobic performance with the highest value of contact angle ∼ 165°. The PSDs of these surfaces, determined from Dubinin-Stoeckli equation, were found to vary with the solid ratios. The modified Wenzel model incorporated with the PSDs gave a fairly good prediction in describing the variation of contact angle with surface roughness, which is very close to the experimental data. These results demonstrated that the heterogeneity of surfaces caused by different PSDs would induce the hydrophobic behavior. |
| Keywords: | Nanostructures Water repellency Wenzel model Pore size distribution Contact angle |
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