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Abstract
We describe the formation of hierarchical dual dimple patterns on polymeric sublayers by evaporation-induced interfacial stress. As water vapor condenses on partially miscible volatile sublayers, the resulting unstable wet-on-wet configurations trigger droplet assembly under ordered convection, giving rise to hexagonal traces of surface dimples, which coexist with highly ordered dimple arrays. Monitoring the time-dependent Marangoni numbers proved that the interfacial stress plays a crucial role in the transition between hierarchically and uniformly ordered dimple patterns.
ACKNOWLEDGMENT
The authors acknowledge financial support from the Japan Society for the Promotion of Science (JSPS) KAKENHI (23560912) Grant-in-Aid for Scientific Research C.