Abstract
In this paper, a gas permeable waterproof film with superhydrophobic characteristics of irregular microstructures and vertical microchannels, is presented. A wet etching technique of aluminum alloys was employed for the preparation of a superhydrophobic surface, and a typical punching technique was used for the fabrication of vertical microchannels. A waterproof film was created via the casting process of polydimethylsiloxane (PDMS). The contact angle of the prepared film was measured as 156°, and the diameter of the vertical microchannel was approximately 100 μm. In the experiment involving maximum liquid entry pressure (LEP) measurement, the LEP of the microtextured PDMS film with 50 vertical microchannels was approximately 16 kPa, whereas the smooth PDMS film could not withstand any pressure. In the long-term reliability test, by using a pressure relief valve of 14 kPa, the fabricated film maintained the water pressure without any leakage.
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