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Phys Rev Lett. 2007 Sep 28;99(13):138303. Epub 2007 Sep 28.

Asymmetry in colloidal diffusion near a rigid wall.

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Departamento de Física, Cinvestav, Avenida IPN 2508, Colonia Zacatenco, 07360 México D.F., Mexico.


The three-dimensional motion of single colloidal particles close to a plane wall is measured by optical microscopy. In accordance with classical theoretical predictions, we find an asymmetric motion of the particles in the directions parallel and perpendicular to the wall. We also find that, close to the wall, the distribution functions of perpendicular steps are asymmetric, being shorter toward the wall and longer away from it.

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