Rotational Diffusion of Spherical Colloids Close to a Wall

Rogers, S.A.; Lang, P.R.; Lisicki, M.; Dhont, J.K.G.; Cichocki, B.

doi:10.1103/PhysRevLett.109.098305

Journal Article

PreJuSER-22839

Rotational Diffusion of Spherical Colloids Close to a Wall

Rogers, S. A.FZJ* ; Lisicki, M. ; Cichocki, B. ; Dhont, J. K. G.FZJ* ; Lang, P. R.FZJ*

2012
APS College Park, Md.

Physical review letters 109, 098305 (2012) [10.1103/PhysRevLett.109.098305]

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Please use a persistent id in citations: http://hdl.handle.net/2128/7592 doi:10.1103/PhysRevLett.109.098305

Abstract: There is currently no experimental technique available to probe spatially resolved rotational diffusion of nanoparticles in the vicinity of a wall. We present the first experimental study of rotational diffusion of small spherical colloids, using dynamic evanescent wave scattering. A setup is used where the wave vector components parallel and perpendicular to the wall can be varied independently, and an expression is derived for the first cumulant of the intensity correlation function in VH evanescent wave geometry for optically anisotropic spheres. The experimental results are in agreement with theoretical predictions that take particle-wall hydrodynamic interactions into account.

Keyword(s): J

Classification:

Physics, Multidisciplinary

Note: The authors acknowledge financial support from the EU through FP7, project Nanodirect (Grant No. NMP4-SL-2008-213948). M. L. acknowledges support by the Foundation for Polish Science, which is co-financed by the European Union (EU)-European Regional Development Fund. B. C. acknowledges financial support from the Deutsche Forschungsgemeinschaft Grant No. SFB-TR6, "Physics of Colloidal Dispersions in External Fields," Project A1.

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