Local viscosity probed by photonic force microscopy.
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| Title: | Local viscosity probed by photonic force microscopy. |
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| Authors: | Pralle, A., Florin, E.-L., Stelzer, E.H.K., Hörber, J.K.H. |
| Source: | Applied Physics A: Materials Science & Processing. 1998, Vol. 66 Issue 7, pS71. 1p. |
| Subjects: | Brownian motion, Styrene, Diffusion, Viscosity |
| Abstract: | Abstract. The Brownian motion of 0.5 micro m and 1 micro m polystyrene spheres used as probes for a photonic force microscope is recorded at various distances from a surface with nanometer spatial and 25 micro s temporal resolution. Analyzing time-windows of 0.4s of the Brownian motion, the diffusion constant and local viscosity are determined. Using 0.5 micro m spheres the viscosity can be measured in volumes as small as 1 micro m[sup 3] 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 micro m down to 200 nm. The increase in viscous drag is found to agree with Brenner's analytical result [1]. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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