| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Forces Acting on Submillimeter Spheres at the Air–Water Interface |
| WANG Le-Feng, LIU Lu, XU Hui-Chao, RONG Wei-Bin**, SUN Li-Ning |
State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150080
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| Cite this article: |
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WANG Le-Feng, LIU Lu, XU Hui-Chao et al 2015 Chin. Phys. Lett. 32 116801 |
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Abstract The forces acting on submillimeter spheres at the air–water interface are investigated theoretically and experimentally. To calculate the capillary force acting on the sphere, an iterative method is used to determine the immersing position of the liquid interface on the sphere for a given distance. Then the total forces acting on the sphere are considered. The scaling effects of the net force acting on the sphere at the air–water interface are demonstrated. For the experiments, the force-position relationship of microspheres is measured with a precise electronic balance. The results show that the evaporation of the liquid in the container affects the measuring results greatly under ambient conditions. After considering the evaporation compensation, there is a great agreement between the theoretical and experimental results. Obvious hysteresis phenomena of the force-distance curve during the emersion processes are also observed and explained.
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Received: 07 June 2015
Published: 01 December 2015
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| PACS: |
68.03.Cd
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(Surface tension and related phenomena)
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68.08.-p
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(Liquid-solid interfaces)
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47.55.dr
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(Interactions with surfaces)
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