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Simultaneous observation of asymmetric speed-dependent capillary force hysteresis and slow relaxation of a suddenly stopped moving contact line.
- Source :
-
Physical review. E [Phys Rev E] 2016 Oct; Vol. 94 (4-1), pp. 042802. Date of Electronic Publication: 2016 Oct 05. - Publication Year :
- 2016
-
Abstract
- We report direct atomic-force-microscope measurements of capillary force hysteresis (CFH) and relaxation of a circular moving contact line (CL) formed on a long micron-sized hydrophobic fiber intersecting a liquid-air interface. By using eight different liquid interfaces with varying solid-liquid molecular interactions, we find a universal behavior of the asymmetric speed dependence of CFH and CL relaxation. A unified model based on force-assisted barrier crossing is used to connect the mesoscopic measurements of CFH and CL relaxation with the energy barrier height E_{b} and size λ associated with the surface defects. The experiment demonstrates that the CL pinning (relaxation) and depinning dynamics are closely related and can be described by a common microscopic framework.
Details
- Language :
- English
- ISSN :
- 2470-0053
- Volume :
- 94
- Issue :
- 4-1
- Database :
- MEDLINE
- Journal :
- Physical review. E
- Publication Type :
- Academic Journal
- Accession number :
- 27841463
- Full Text :
- https://doi.org/10.1103/PhysRevE.94.042802