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Progress in understanding wetting transitions on rough surfaces.
Adv Colloid Interface Sci. 2015 Aug; 222:92-103.AC

Abstract

The abrupt change in the apparent contact angle occurring on a rough surface is called wetting transition. This change may be spontaneous or promoted by external stimuli such as pressure or vibration. Understanding the physical mechanism of wetting transitions is crucial for the design of highly stable superhydrophobic and omniphobic materials. Wetting regimes occurring on rough surfaces are introduced. Experimental methods of study of wetting transitions are reviewed. Physical mechanisms of wetting transitions on rough surfaces are discussed. Time and energy scaling of wetting transitions are addressed. The problem of the stability of Cassie wetting on inherently hydrophobic and hydrophilic surfaces is discussed. The origin and value of a barrier separating the Cassie and Wenzel wetting states are treated in detail. Hierarchical roughness increases the value of the energy barrier. The stability of Cassie wetting observed on re-entrant topographies is explained. The irreversibility of wetting transitions is explained, based on the asymmetry of the energy barrier, which is low from the side of the metastable (higher-energy) state and high from the side of the stable state. The critical pressure necessary for a wetting transition is introduced. The problem of "dimension" of wetting transition is discussed. Reducing the micro-structural scales enlarges the threshold pressure of a wetting transition. The roles of gravity and air compressibility in wetting transitions are treated. The dynamics of wetting transitions is reviewed. The results of molecular simulations of wetting transitions are presented. The trends of future investigations are envisaged.

Authors+Show Affiliations

Ariel University, Physics Faculty, P.O.B. 3, Ariel 40700, Israel. Electronic address: edward@ariel.ac.il.

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

24594103

Citation

Bormashenko, Edward. "Progress in Understanding Wetting Transitions On Rough Surfaces." Advances in Colloid and Interface Science, vol. 222, 2015, pp. 92-103.
Bormashenko E. Progress in understanding wetting transitions on rough surfaces. Adv Colloid Interface Sci. 2015;222:92-103.
Bormashenko, E. (2015). Progress in understanding wetting transitions on rough surfaces. Advances in Colloid and Interface Science, 222, 92-103. https://doi.org/10.1016/j.cis.2014.02.009
Bormashenko E. Progress in Understanding Wetting Transitions On Rough Surfaces. Adv Colloid Interface Sci. 2015;222:92-103. PubMed PMID: 24594103.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Progress in understanding wetting transitions on rough surfaces. A1 - Bormashenko,Edward, Y1 - 2014/02/17/ PY - 2013/10/16/received PY - 2014/02/04/revised PY - 2014/02/04/accepted PY - 2014/3/6/entrez PY - 2014/3/7/pubmed PY - 2014/3/7/medline KW - Apparent contact angle KW - Cassie wetting KW - Rough surfaces KW - Superhydrophobicity KW - Wenzel wetting KW - Wetting states KW - Wetting transitions SP - 92 EP - 103 JF - Advances in colloid and interface science JO - Adv Colloid Interface Sci VL - 222 N2 - The abrupt change in the apparent contact angle occurring on a rough surface is called wetting transition. This change may be spontaneous or promoted by external stimuli such as pressure or vibration. Understanding the physical mechanism of wetting transitions is crucial for the design of highly stable superhydrophobic and omniphobic materials. Wetting regimes occurring on rough surfaces are introduced. Experimental methods of study of wetting transitions are reviewed. Physical mechanisms of wetting transitions on rough surfaces are discussed. Time and energy scaling of wetting transitions are addressed. The problem of the stability of Cassie wetting on inherently hydrophobic and hydrophilic surfaces is discussed. The origin and value of a barrier separating the Cassie and Wenzel wetting states are treated in detail. Hierarchical roughness increases the value of the energy barrier. The stability of Cassie wetting observed on re-entrant topographies is explained. The irreversibility of wetting transitions is explained, based on the asymmetry of the energy barrier, which is low from the side of the metastable (higher-energy) state and high from the side of the stable state. The critical pressure necessary for a wetting transition is introduced. The problem of "dimension" of wetting transition is discussed. Reducing the micro-structural scales enlarges the threshold pressure of a wetting transition. The roles of gravity and air compressibility in wetting transitions are treated. The dynamics of wetting transitions is reviewed. The results of molecular simulations of wetting transitions are presented. The trends of future investigations are envisaged. SN - 1873-3727 UR - https://www.unboundmedicine.com/medline/citation/24594103/Progress_in_understanding_wetting_transitions_on_rough_surfaces_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0001-8686(14)00053-0 DB - PRIME DP - Unbound Medicine ER -
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