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Evaluation of macroscale wetting equations on a microrough surface.
Langmuir. 2015 Mar 03; 31(8):2342-50.L

Abstract

The wettability of critical droplets on microscale geometric rough surfaces has been investigated using a density functional theory approach. In order to analyze the effect of roughness on nucleation free-energy barriers, the local density fluctuations at liquid-solid interfaces induced by the multi-interactions of a corner substrate are presented to interpret the interfacial free-energy variations, and the vapor-liquid-solid contact line tensions are derived from the contact angles of nuclei to account for the three-phase contact energies. The corresponding wetting diagrams have been constructed in Cassie, Wenzel, and impregnation regions. It is shown that, under the same condition, modest deviations between the microscale and the macroscale models can be observed within the Cassie region, whereas these deviations have been enlarged in the Wenzel and impregnation regions as well as the Cassie-Wenzel transition region. These deviations are also correlated to the roughness of the surface. The reason can be attributed to the cooperative effect of the liquid-solid interfacial free energy and line tension. This study offers a fundamental understanding of wettability of ultrasmall droplets on a microscale geometric rough surface.

Authors+Show Affiliations

State Key Laboratory of Organic-Inorganic Composites and ‡The Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education, Beijing University of Chemical Technology , Beijing 100029, China.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

25654557

Citation

Wang, Yang, et al. "Evaluation of Macroscale Wetting Equations On a Microrough Surface." Langmuir : the ACS Journal of Surfaces and Colloids, vol. 31, no. 8, 2015, pp. 2342-50.
Wang Y, Wang X, Du Z, et al. Evaluation of macroscale wetting equations on a microrough surface. Langmuir. 2015;31(8):2342-50.
Wang, Y., Wang, X., Du, Z., Zhang, C., Tian, M., & Mi, J. (2015). Evaluation of macroscale wetting equations on a microrough surface. Langmuir : the ACS Journal of Surfaces and Colloids, 31(8), 2342-50. https://doi.org/10.1021/la505035k
Wang Y, et al. Evaluation of Macroscale Wetting Equations On a Microrough Surface. Langmuir. 2015 Mar 3;31(8):2342-50. PubMed PMID: 25654557.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Evaluation of macroscale wetting equations on a microrough surface. AU - Wang,Yang, AU - Wang,Xiangdong, AU - Du,Zhongjie, AU - Zhang,Chen, AU - Tian,Ming, AU - Mi,Jianguo, Y1 - 2015/02/13/ PY - 2015/2/6/entrez PY - 2015/2/6/pubmed PY - 2015/12/15/medline SP - 2342 EP - 50 JF - Langmuir : the ACS journal of surfaces and colloids JO - Langmuir VL - 31 IS - 8 N2 - The wettability of critical droplets on microscale geometric rough surfaces has been investigated using a density functional theory approach. In order to analyze the effect of roughness on nucleation free-energy barriers, the local density fluctuations at liquid-solid interfaces induced by the multi-interactions of a corner substrate are presented to interpret the interfacial free-energy variations, and the vapor-liquid-solid contact line tensions are derived from the contact angles of nuclei to account for the three-phase contact energies. The corresponding wetting diagrams have been constructed in Cassie, Wenzel, and impregnation regions. It is shown that, under the same condition, modest deviations between the microscale and the macroscale models can be observed within the Cassie region, whereas these deviations have been enlarged in the Wenzel and impregnation regions as well as the Cassie-Wenzel transition region. These deviations are also correlated to the roughness of the surface. The reason can be attributed to the cooperative effect of the liquid-solid interfacial free energy and line tension. This study offers a fundamental understanding of wettability of ultrasmall droplets on a microscale geometric rough surface. SN - 1520-5827 UR - https://www.unboundmedicine.com/medline/citation/25654557/Evaluation_of_macroscale_wetting_equations_on_a_microrough_surface_ L2 - https://dx.doi.org/10.1021/la505035k DB - PRIME DP - Unbound Medicine ER -
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