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with ±15% precision within 0.4 s. The decrease of the diffusion coefficient due to the partial confinement near a surface is measured continuously over sphere–surface separations from 3 μm down to 200 nm. The increase in viscous drag is found to agree with Brenner’s analytical result [1].
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Received: 25 July 1997/Accepted: 1 October 1997
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Pralle, A., Florin, EL., Stelzer, E. et al. Local viscosity probed by photonic force microscopy . Appl Phys A 66 (Suppl 1), S71–S73 (1998). https://doi.org/10.1007/s003390051102
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DOI: https://doi.org/10.1007/s003390051102