Abstract
Dynamic spreading over superhydrophobic and copper surfaces was studied experimentally under the condition of contact line movement with speed greater than 1 mm/sec. Three modes of spreading of distilled water drop over copper surfaces with sufficient typical roughness (0.591, 5.190 and 6.210 μM) were detected. The first one is drop formation when the contact line speed and dynamic contact angle increase sharply. The second mode is spreading of a drop, which is characterized by a monotonic decrease in the contact line speed and dynamic contact angle. The third one is a formation of an equilibrium contact angle at a constant wetted area (the contact line speed tends to zero, and spreading of a drop occurs as long as the driving force is greater than zero). Some features in spreading were detected on superhydrophobic surface with parameter roughness of 0.751μm compared to other substrates. During drop formation after sharp increase in the contact line speed and dynamic contact angle, there is a mode which is accompanied by a decrease in the contact line speed and monotonic increase in the advancing dynamic contact angle.
Highlights
Superhydrophobic surface is not a unique phenomenon in nature, and it is common to many plants and insects
A similar effect can be obtained in automobile manufacturing at treatment of car body by superhydrophobic coating
The first mode is characterized by the drop formation; the contact line speed and dynamic contact angle increase sharply
Summary
Superhydrophobic surface is not a unique phenomenon in nature, and it is common to many plants and insects. In the textile industry hydrophobe processing of clothes will allow to make them waterproof, anti-dirtying in contact with coloring food and drinks. In the power industry there are several examples of using superhydrophobic surfaces: design of filters for cleaning of fuels and oils The use of such filters allow to separate water-oil emulsions with high efficiency in a wide range of compositions of dispersion systems and the particle size of the dispersed phase. Such surfaces have a great potential in aviation when creating anti-icing surfaces
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