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Why re-entrant surface topography is needed for robust oleophobicity.
Philos Trans A Math Phys Eng Sci. 2016 Aug 06; 374(2073)PT

Abstract

Surface patterns affect wetting properties of solid materials allowing manipulation of the phase state of an adjacent fluid. The best known example of this effect is the superhydrophobic composite (Cassie-Baxter) interface with vapour/air pockets between the solid and liquid. Mathematically, the effect of surface micropatterns can be studied by an averaging technique similarly to the method of separation of motions in dynamics. However, averaged parameters are insufficient for robust superhydrophobic and superoleophobic surfaces because additional topography features are important: hierarchical organization and re-entrant roughness. The latter is crucial for the oleophobicity because it enhances the stability of a composite interface. The re-entrant topography can be achieved by various methods. Understanding the role of re-entrant surface topography gives us new insights on the multitude of wetting scenarios beyond the standard Wenzel and Cassie-Baxter models.This article is part of the themed issue 'Bioinspired hierarchically structured surfaces for green science'.

Authors+Show Affiliations

College of Engineering and Applied Science, University of Wisconsin, Milwaukee, WI 53201, USA bhushan.2@osu.edu.Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, Ohio State University, 201 W 19th Ave, Columbus, OH 43210, USA.

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

27354728

Citation

Nosonovsky, Michael, and Bharat Bhushan. "Why Re-entrant Surface Topography Is Needed for Robust Oleophobicity." Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, vol. 374, no. 2073, 2016.
Nosonovsky M, Bhushan B. Why re-entrant surface topography is needed for robust oleophobicity. Philos Trans A Math Phys Eng Sci. 2016;374(2073).
Nosonovsky, M., & Bhushan, B. (2016). Why re-entrant surface topography is needed for robust oleophobicity. Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences, 374(2073). https://doi.org/10.1098/rsta.2016.0185
Nosonovsky M, Bhushan B. Why Re-entrant Surface Topography Is Needed for Robust Oleophobicity. Philos Trans A Math Phys Eng Sci. 2016 Aug 6;374(2073) PubMed PMID: 27354728.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Why re-entrant surface topography is needed for robust oleophobicity. AU - Nosonovsky,Michael, AU - Bhushan,Bharat, PY - 2016/04/20/accepted PY - 2016/6/30/entrez PY - 2016/6/30/pubmed PY - 2016/9/14/medline KW - oleophobicity KW - re-entrant surface topography KW - superhydrophobicity KW - wetting JF - Philosophical transactions. Series A, Mathematical, physical, and engineering sciences JO - Philos Trans A Math Phys Eng Sci VL - 374 IS - 2073 N2 - Surface patterns affect wetting properties of solid materials allowing manipulation of the phase state of an adjacent fluid. The best known example of this effect is the superhydrophobic composite (Cassie-Baxter) interface with vapour/air pockets between the solid and liquid. Mathematically, the effect of surface micropatterns can be studied by an averaging technique similarly to the method of separation of motions in dynamics. However, averaged parameters are insufficient for robust superhydrophobic and superoleophobic surfaces because additional topography features are important: hierarchical organization and re-entrant roughness. The latter is crucial for the oleophobicity because it enhances the stability of a composite interface. The re-entrant topography can be achieved by various methods. Understanding the role of re-entrant surface topography gives us new insights on the multitude of wetting scenarios beyond the standard Wenzel and Cassie-Baxter models.This article is part of the themed issue 'Bioinspired hierarchically structured surfaces for green science'. SN - 1364-503X UR - https://www.unboundmedicine.com/medline/citation/27354728/Why_re_entrant_surface_topography_is_needed_for_robust_oleophobicity_ L2 - https://royalsocietypublishing.org/doi/full/10.1098/rsta.2016.0185?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -