Two-Particle Microrheology of Quasi-2D Viscous Systems (original) (raw)
NASA/ADS
;
Abstract
We study the spatially correlated motions of colloidal particles in a quasi-2D system (human serum albumin protein molecules at an air-water interface) for different surface viscosities ηs. We observe a transition in the behavior of the correlated motion, from 2D interface dominated at high ηs to bulk fluid dependent at low ηs. 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. The scale factors used for the master curve allow for the calculation of the surface viscosity ηs that can be compared to one-particle measurements.
Publication:
Physical Review Letters
Pub Date:
October 2006
DOI:
arXiv:
Bibcode:
Keywords:
- 83.10.Mj;
- 68.35.Fx;
- 87.16.Dg;
- 87.68.+z;
- Molecular dynamics Brownian dynamics;
- Diffusion;
- interface formation;
- Membranes bilayers and vesicles;
- Biomaterials and biological interfaces;
- Condensed Matter - Soft Condensed Matter;
- Physics - Physics and Society
E-Print:
4 pages, 4 figures, submitted to PRL