Selective directional liquid transport on artificial CMIAs. (IMAGE)

The Hong Kong Polytechnic University

Selective directional liquid transport on artificial CMIAs.

Caption

(A) Schematic of the CMIA. Structural characteristics consists of the upper height (H), lower height (h), bottom to bottom spacing (d), upper-tilting reentrant angle (ω1) and lower-tilting reentrant angle (ω2). (B) Scanning electron microscope images of a 3D printed fin on the CMIA with side view and top view. (C) Normalized lengths (l/d) versus time on CMIA I with ω1 = 70°, ω2 = 40° (blue symbols) and CMIA II with ω1 = 51°, ω2 = 57° (red symbols). (D and E) Timelapse images of selective directional liquid transport on two artificial CMIAs. Ethanol is transported in the negative direction and pinned toward the positive side (indicated by orange triangles) on CMIA I, while it spreads in the positive direction and is thwarted in the reverse side (indicated by orange triangles) on CMIA II. This selective directional liquid transport phenomenon manifests through the heterogeneous liquid meniscus and is separated by two sites in which the liquid meniscus is pinned by the lower fin edge (red arrows) and the front edge of the liquid meniscus reaches the adjacent fin (green arrows).

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© 2024 Research and Innovation Office, The Hong Kong Polytechnic University. All Rights Reserved.

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