, Volume 66, Issue 1 Supplement, pp S71-S73

Local viscosity probed by photonic force microscopy

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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].

Received: 25 July 1997/Accepted: 1 October 1997