Chin. Phys. Lett.  2009, Vol. 26 Issue (12): 126801    DOI: 10.1088/0256-307X/26/12/126801
CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
Capillary Forces between Submillimeter Spheres and Flat Surfaces at Constant Liquid Volumes
WANG Le-Feng, RONG Wei-Bin, SUN Li-Ning, CHEN Li-Guo, SHAO Bing
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080
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WANG Le-Feng, RONG Wei-Bin, SUN Li-Ning et al  2009 Chin. Phys. Lett. 26 126801
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Abstract We investigate the capillary forces between submillimeter spheres and flat surfaces at constant liquid volumes theoretically and experimentally. An iterative method is used to estimate the capillary force with contact angles as the boundary conditions and the constant volume as a constraint. The theoretical analysis shows that the maximum capillary force between them decreases with the increase of the liquid bridge volume at small contact angles. The experimental results show that the force is smaller than the theoretical values at the initial separation distances. It is also observed that the force first increases and then decreases with an increasing separation distance in some cases. These phenomena of capillary forces hysteresis are explained according to the wetting hysteresis.
Keywords: 68.03.Cd      68.08.-p      47.55.Dr     
Received: 20 April 2009      Published: 27 November 2009
PACS:  68.03.Cd (Surface tension and related phenomena)  
  68.08.-p (Liquid-solid interfaces)  
  47.55.dr (Interactions with surfaces)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/12/126801       OR      https://cpl.iphy.ac.cn/Y2009/V26/I12/126801
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WANG Le-Feng
RONG Wei-Bin
SUN Li-Ning
CHEN Li-Guo
SHAO Bing
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