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    Wetting properties of hybrid structure with hydrophilic ridges and hydrophobic channels

    Year: 2018

    Journal: Appl. Phys. A-Mater. Sci. Process., Volume 124, FEB

    Authors: Lee, Dong-Ki; Choi, Su Young; Park, Min Soo; Cho, Young Hak

    Organizations: National Research Foundation of Korea (NRF) Grant - Korean government (MSIP) [NRF-2017R1D1A1B03029817]

    In the present study, we fabricated a hybrid structure where the upper surface of the ridge is hydrophilic and the inner surface of the channel is hydrophobic. Laser-induced backside wet etching (LIBWE) process was performed to machine the hybrid structure on a Pyrex glass substrate. Wetting properties were evaluated from static contact angles (CAs) measurement in parallel and orthogonal directions. The water droplet on the hybrid structure was in the Cassie-Baxter state and showed anisotropic wetting property along groove lines. Moisture condensation studies under humid condition indicated that water droplets grew and coalesced on the ridge with hydrophilicity. Furthermore, water-oil separation was tested using a microfluidic chip with the developed hybrid structure. In case of hybrid micro-fluidic chip, the water could not flow into channel but the hexadecane could flow due to the capillary pressure difference.
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