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Issue 43, 2016
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Perpetual superhydrophobicity

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Abstract

A liquid droplet placed on a geometrically textured surface may take on a “suspended” state, in which the liquid wets only the top of the surface structure, while the remaining geometrical features are occupied by vapor. This superhydrophobic Cassie–Baxter state is characterized by its composite interface which is intrinsically fragile and, if subjected to certain external perturbations, may collapse into the fully wet, so-called Wenzel state. Restoring the superhydrophobic Cassie–Baxter state requires a supply of free energy to the system in order to again nucleate the vapor. Here, we use microscopic classical density functional theory in order to study the Cassie–Baxter to Wenzel and the reverse transition in widely spaced, parallel arrays of rectangular nanogrooves patterned on a hydrophobic flat surface. We demonstrate that if the width of the grooves falls below a threshold value of ca. 7 nm, which depends on the surface chemistry, the Wenzel state becomes thermodynamically unstable even at very large positive pressures, thus realizing a “perpetual” superhydrophobic Cassie–Baxter state by passive means. Building upon this finding, we demonstrate that hierarchical structures can achieve perpetual superhydrophobicity even for micron-sized geometrical textures.

Graphical abstract: Perpetual superhydrophobicity

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Publication details

The article was received on 27 Jul 2016, accepted on 05 Oct 2016 and first published on 07 Oct 2016


Article type: Paper
DOI: 10.1039/C6SM01727D
Citation: Soft Matter, 2016,12, 8927-8934
  • Open access: Creative Commons BY license
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    Perpetual superhydrophobicity

    A. Giacomello, L. Schimmele, S. Dietrich and M. Tasinkevych, Soft Matter, 2016, 12, 8927
    DOI: 10.1039/C6SM01727D

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