Two-Particle Microrheology of quasi-2D Viscous Systems

Details Two-Particle Microrheology of quasi-2D Viscous Systems Two-Particle Microrheology of quasi-2D Viscous Systems

2006-04-11

arxiv.org/abs/cond-mat/0604262v2

Phys. Rev. Lett. 97, 176001 (2006)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, submitted to PRL

Scientific paper

10.1103/PhysRevLett.97.176001

We study the correlated motions of colloidal particles in a quasi-2D system (Human Serum Albumin (HSA) protein molecules at an air-water interface) for different surface viscosities $\eta_{s}$. We observe a transition in the behavior of the correlated motion, from 2-D interface dominated at high $\eta_{s}$ to bulk fluid-dependent at low $\eta_{s}$. The correlated motions can be scaled onto a master curve which captures the features of this transition. This master curve also characterizes the spatial dependence of the flow field of a viscous interface in response to a force. From the flow field and the correlated particle motions, we calculate a two-particle MSD (mean square displacement) for direct comparison with rheological measurements.

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