Page 146 - Handbook of Surface Improvement and Modification

9.1 Methods and mechanisms of hydrophobization 141

Figure 9.5. Schematic illustration of the synthesis of superhydrophobic composite coating on fiberglass cloth sur-
face. [Adapted, by permission, from Zang, D; Liu, F; Zhang, M; Niu, X; Gao, Z; Wang, C, Chem. Eng. J., 262,
210-5, 2015.]

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angle of 5 . The fiberglass cloth exhibited outstanding water-oil separation property with
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separation efficiency of 98%.
The state and stability of supercooled water on superhydrophobic surfaces is crucial
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for low temperature applications. It affects anti-icing and de-icing properties. Surface
characteristics such as topography and chemistry affect wetting hysteresis during tempera-
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ture cycling experiments and the freezing delay of supercooled water. Liquid flame
spraying was utilized to create a multi-scale roughness on wood surface by depositing tita-
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nium dioxide nanoparticles. The coating was then made non-polar using a thin plasma
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polymer layer. The modified silica surfaces with similar chemistries were utilized as flat
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reference samples. These substrates were used to test the hypothesis that superhydropho-
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bic surfaces should retard ice formation. The hysteresis in contact angle observed during