Optical micrographs of a thermocapillary instability in molten nanofilms that creates arrays of cold-seeking protrusions. Top: Structured growth beneath a cooled cylindrical mesa before (left) and after contact (right). Bottom: Growth beneath a more distant cooled sapphire window at early (left) and late times (right).
From the article:
Experimental Verification of the Formation Mechanism for Pillar Arrays in Nanofilms Subject to Large Thermal GradientsEuan McLeod, Yu Liu, and Sandra M. Troian
Phys. Rev. Lett. 106, 175501 (2011)
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