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Non-Contact to Contact Transition: Direct Measurements of Interaction Forces between a Solid Probe and a Planar Air--Water Interface |
| WU Di;WANG Yi-Zhen;ZHANG Jin-Xiu |
| State Key Laboratory of Optoelectronic Materials and Technologies and Department of Physics, Sun Yat-sen University, Guangzhou 510275 |
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| Cite this article: |
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WU Di, WANG Yi-Zhen, ZHANG Jin-Xiu 2007 Chin. Phys. Lett. 24 2914-2917 |
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Abstract The interaction force between a solid probe and a planar air--water interface is measured by using an atomic force microscope. It is demonstrated that during the approach of the probe to the air--water interface, the force curves decline all the time due to the van der Waals attraction and induces a stable profile of water surface raised. When the tip approaches very close to the water surface, force curves jump suddenly, reflecting the complex behaviour of the unstable water surface. With a theoretical analysis we conclude that before the tip touches water surface, two water profiles appear, one stable and the other unstable. Then, with further approaching, the tip touches water
surface and the non-contact to contact transition occurs.
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| Keywords:
68.08.-p
68.37.Ps
47.20.Dr
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Received: 28 March 2007
Published: 20 September 2007
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| PACS: |
68.08.-p
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(Liquid-solid interfaces)
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68.37.Ps
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(Atomic force microscopy (AFM))
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47.20.Dr
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(Surface-tension-driven instability)
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