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首页> 外文期刊>Journal of Sol-Gel Science and Technology >Wettability of Microstructured Hydrophobic Sol-Gel Coatings
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Wettability of Microstructured Hydrophobic Sol-Gel Coatings

机译：微结构憎水溶胶-凝胶涂层的润湿性

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The formation of appropriate surface patterns on lydrophobic surfaces leads to a general change in their wettability and the contact angle increases substanially.Such coatings are of great technical interest,especially if aqueous media are concerned as in the prevention of ice-adhesion.For this reason various fluorine containing nanocomposite coatings have been developed by sol-gel processing.The morphology of these hydrophobic surfaces has been controlled by varying the content of silica particles reagrding si,degree of aggregation,and ocncentration.The wettability is characterized by themeasurement of dynamic contact angles against water.The complete range of different wettability regines is accessible,i.e.smooth surfaces (hoth low advancing contact angle and hyst3resis between advanicing and receding contact angle),surfaces (high advancing contact angle and low hysteresis).The wettability is correlated with the surface roughness as determined using a profilometer or AFM.The wettability of superhydrophobic surfaces is greatly dependent on the surface tension of the liquid.By comparison of the tiltangle theta_t of a smooth and a superhydrophobic surface,a critical surface tension gamma_c is identified,where theta_t (smooth surface)=gamma_t (microstructured surface).The microstructured surface provides a better run-off of liquids gamma_lg > gamma_capprox = 55 mN.m~-1.
机译：在疏水性表面上形成适当的表面图案会导致其润湿性发生一般性变化，并且接触角会显着增加。此类涂层具有重大的技术意义，尤其是在考虑水性介质（如防止结冰）的情况下。通过溶胶-凝胶工艺开发了各种含氟纳米复合涂层。通过改变硅颗粒的含量，聚集度和浓度来控制疏水表面的形貌。通过测量动态接触角来表征润湿性可以接触到各种不同的润湿性区域，包括光滑的表面（前进接触角和后退接触角之间低的接触角和滞后性），表面（前进接触角和滞后性低的滞后性）。润湿性与表面相关使用轮廓仪或AFM确定的粗糙度。超疏水表面的性质在很大程度上取决于液体的表面张力。通过比较光滑表面和超疏水表面的倾斜角theta_t，可以确定临界表面张力gamma_c，其中theta_t（光滑表面）= gamma_t（微结构化表面）。微结构表面提供了更好的液体溢流gamma_lg> gamma_capprox = 55 mN.m〜-1。

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