Figure 2: Hydrophobicity of patterned S-PDMS surfaces. | Scientific Reports

Figure 2: Hydrophobicity of patterned S-PDMS surfaces.

From: Continuity of Monolayer-Bilayer Junctions for Localization of Lipid Raft Microdomains in Model Membranes

Figure 2

(A) Microphotographs showing the contact angles of water on a hydroxylated glass surface (θ1 = 6°, inset) and on the S-PDMS surface transferred at 200 °C for 3 min (θ2 = 80°). (B) A water droplet expelled from the S-PDMS pattern (white rectangle; 1 cm x 2 cm) transferred to a piranha-cleaned glass of 2 cm × 2 cm, showing the distinct wettability boundary along the S-PDMS pattern. The upper inset shows the schematic illustrations of the experiment. (C) The stamping process of the PDMS on a glass substrate and the SEM image of the PDMS stamp. (D) A microphotograph obtained during the water vapor test on square regions (50 μm × 50 μm each) enclosed by 15 μm-wide PDMS grids shows that water only condenses on the hydrophilic glass regions bounded by S-PDMS. The scale bar is 50 μm. (E,F), The AFM image (E) of the glass (non-contact) and S-PDMS (contact) regions, and corresponding thickness profiles (F) along two paths, (A,B) across the boundary between the glass and S-PDMS regions.

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