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当水与材料的表面接触时,对于亲水材料水滴会散开;对于疏水材料则形成水珠。这种现象是由水滴边缘和水滴下面的表面所成的角度——所谓的接触角——决定的。当接触角大于90°时表面是疏水的,大于160°时材料是超疏水的。超疏水性与表面化学及表面材质有关。当疏水表面暴露在雾中或潮湿的环境里,湿气会凝结成微小的水滴,其大小与表面的结构相当,微小的水滴将停留在表面结构中,随着露水累积,水滴增大,结果材料变湿。
When the water comes in contact with the surface of the material, water drops spread out for the hydrophilic material, and water drops for the hydrophobic material. This phenomenon is determined by the angle between the edge of the drop and the surface below the water drop - the so-called contact angle. The surface is hydrophobic when the contact angle is greater than 90 ° and the material is superhydrophobic above 160 °. Superhydrophobic surface chemistry and surface materials. When the hydrophobic surface is exposed to fog or humid environment, the moisture condenses into tiny droplets whose size is comparable to that of the surface. The tiny water droplets will stay in the surface structure. As the dew water accumulates, the water droplets increase. As a result The material gets wet.