期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 552, 期 -, 页码 563-571出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2019.05.081
关键词
Droplet wettability; Contact angle; Sharp edge; Contact line pinning
资金
- National Natural Science Foundation of China (NSFC) [U1562105, 11372313]
- Chinese Academy of Sciences (CAS) through CAS Interdisciplinary Innovation Team Project
- CAS Key Research Program of Frontier Sciences [QYZDJ-SSW-JSC019]
- CAS Strategic Priority Research Program [XDB22040401]
Understanding the role of pinning force in droplet dynamic wetting is of critical importance for surface science studies. Generally, the pinning force is only related to the surface tension and the change of contact angle. However, there is an obvious correlation between the pinning force and the surface geometry. In this paper, the relation between the surface geometry and contact line pinning was studied with systematical experiments and theoretical analysis. We compared the samples with different edge angles and carried out plenty experiments with different liquids. Meanwhile, the theoretical analysis and molecular simulation were carried out. The results show that the sharp edge has a strong pinning effect on the contact line and can significantly change the contact angle and wetting state of droplets. The maximum contact angle of droplet has a linear relation with the edge angle of substrate. The formula of pinning force was revised to consider the impact of surface topography. According to the relationship between surface defect and contact line, we proposed a model to classify the cases of contact line pinning for the first time. Our research will deepen the understanding of contact line pinning and provide help for potentially industrial production designs. (C) 2019 Elsevier Inc. All rights reserved.
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