Abstract
In this work, we have studied the wettability of zinc oxide (ZnO) nanorods grown on fluorine-doped tin oxide (FTO) by highlighting the effect of polar and non-polar ZnO facets on contact angle (CA) results. The variation in the wettability behaviors of the synthesized surfaces is mainly related to physical and chemical surface texturing which influenced the liquid drop penetration. Indeed, three main penetration states can be deduced: total, partial, and null-penetration. Where, low CA (100.9°) with high contact angle hysteresis (CAH) (13°) is observed for total penetration of the liquid drop. While, high CA (139.6°) with low CAH (7°) is observed for null-penetration. Moreover, we have found that the chemical texturing of ZnO, especially the hydrophilicity of ZnO tips, responsible for liquid drop sticking, prevents the liquid slipping over the surface. In order to promote the liquid rolling on the ZnO surface, we reported the physical modification of the ZnO structures. Therefore, the rolling of the liquid drop on the inclined surface of ZnO is achieved by using a new structure based on double scale roughness. This surface exhibits superhydrophobic behavior with a CA of 153° and CAH of 3°.
Highlights
The wettability is a surface property which describes the interaction between a liquid and a solid surface
We have studied the wettability of zinc oxide (ZnO) nanorods grown on fluorine-doped tin oxide (FTO) by highlighting the effect of polar and non-polar ZnO facets on contact angle (CA) results
We have found that the chemical texturing of ZnO, especially the hydrophilicity of ZnO tips, responsible for liquid drop sticking, prevents the liquid slipping over the surface
Summary
The wettability is a surface property which describes the interaction between a liquid and a solid surface. Paper nominated candidates in the manufacture of self-cleaning surfaces based on super-hydrophobic behavior These molecules with low surface energy largely increase the contact angle value, which can sometimes reach values higher than 170.20 the use of silicic molecules such as octadecylsilane have been very successful in the manufacture of superhydrophobic surfaces, but they remain expensive and toxic.[21] fatty acids are cheaper, non-toxic and more prevalent in nature. They have proven to be more effective. The rolling of the liquid drop is achieved by modifying the roughness of the surface
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