Please use this identifier to cite or link to this item: https://doi.org/10.1021/la900341r
Title: Asymmetric wetting of patterned surfaces composed of intrinsically hysteretic materials
Authors: Anantharaju, N.
Panchagnula, M.V.
Vedantam, S. 
Issue Date: 7-Jul-2009
Source: Anantharaju, N., Panchagnula, M.V., Vedantam, S. (2009-07-07). Asymmetric wetting of patterned surfaces composed of intrinsically hysteretic materials. Langmuir 25 (13) : 7410-7415. ScholarBank@NUS Repository. https://doi.org/10.1021/la900341r
Abstract: Wetting of chemically heterogeneous surfaces is modeled using a phase field theory. We focus on a chemically heterogeneous surface composed of squares of one component material embedded in another. Unlike previous studies where the component materials were characterized only by an equilibrium contact angle, in this paper each of the component materials is constitutively allowed to exhibit hysteresis. Using this approach, we investigate the effect of heterogeneity length scale on observed macroscopic behavior. Cassie theory is found to be applicable only in the limit of vanishing length scale. For surfaces with a finite heterogeneity length scale, the advancing and receding contact angles deviate from Cassie theory. We find that this deviation and its length scale dependence are asymmetric and depend on the wetting properties of the embedded material relative to the contiguous substrate. © 2009 American Chemical Society.
Source Title: Langmuir
URI: http://scholarbank.nus.edu.sg/handle/10635/59588
ISSN: 07437463
DOI: 10.1021/la900341r
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