Dynamic Dewetting through Micropancake Growth

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Seddon, James R.T. and Bliznyuk, Olesya and Kooij, E. Stefan and Poelsema, Bene and Zandvliet, Harold J.W. and Lohse, Detlef (2010) Dynamic Dewetting through Micropancake Growth. Langmuir, 26 (12). pp. 9640-9644. ISSN 0743-7463

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Abstract:We experimentally investigate the dynamics of nanometer-high, micrometer-wide gassy layers at the interface between a hydrophobic solid and bulk water. These micropancakes grow laterally in time, on the timescale of an hour, leading to partial dewetting of the solid. The growth is directional, mediated by chemical roughness on the substrate, and transient, occurring within the first hour after liquid deposition. We use circularity to measure the roundness of a micropancake (circularity C = 2(πA)1/2/L, where A is the surface area and L is the perimeter). The growth is anisotropic, as demonstrated by a decrease in circularity with time. However, once a micropancake reaches size saturation, its bulk rearranges its shape in order to minimize the length of its three-phase line. We interpret this combination of growth followed by bulk rearrangement as dynamic dewetting.
Item Type:Article
Copyright:© 2010 American Chemical Society
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/72811
Official URL:http://dx.doi.org/10.1021/la101414x
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Metis ID: 266596