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Quantized contact angles in the dewetting of a structured liquid

Ilton, M., Stasiak, P., Matsen, M. W. and Dalnoki-Veress, K. (2014) Quantized contact angles in the dewetting of a structured liquid. Physical Review Letters, 112 (6). 068303. ISSN 0031-9007

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To link to this item DOI: 10.1103/PhysRevLett.112.068303

Abstract/Summary

We investigate the dewetting of a disordered melt of diblock copolymer from an ordered residual wetting layer. In contrast to simple liquids where the wetting layer has a fixed thickness and the droplets exhibit a single unique contact angle with the substrate, we find that structured liquids of diblock copolymer exhibit a discrete series of wetting layer thicknesses each producing a different contact angle. These quantized contact angles arise because the substrate and air surfaces each induce a gradient of lamellar order in the wetting layer. The interaction between the two surface profiles creates an effective interface potential that oscillates with film thickness, thus, producing a sequence of local minimums. The wetting layer thicknesses and corresponding contact angles are a direct measure of the positions and depths of these minimums. Self-consistent field theory is shown to provide qualitative agreement with the experiment.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:67530
Publisher:American Physical Society

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