Summary: Reversible switching between superhydrophobic and superhydrophilic wettability of a polyamide film with a triangular net‐like structure can be achieved by biaxially extending and unloading the elastic film. Both the change of the average side‐length of the triangular net‐like structure upon biaxial extension and unloading, and the surface tension of the water droplet, are believed to be responsible for the reversible switching between superhydrophobicity and superhydrophilicity.Change in structure and wettability of the triangular net‐like polyamide film upon extension and unloading.imageChange in structure and wettability of the triangular net‐like polyamide film upon extension and unloading.
Two-dimensionally ordered honeycomb structures have been prepared on dodecanethiol-capped gold nanoparticle films by blowing moist air across the surface of the nanoparticle solution. The pore morphology can be altered from circle to ellipse with tunable aspect ratios by carefully controlling the direction and velocity of airflow. The formation mechanisms of different surface morphologies have been discussed in terms of the surface and interfacial tension.
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