Two-particle microrheology of quasi-2D viscous systems - PubMed (original) (raw)
. 2006 Oct 27;97(17):176001.
doi: 10.1103/PhysRevLett.97.176001. Epub 2006 Oct 24.
Affiliations
- PMID: 17155483
- DOI: 10.1103/PhysRevLett.97.176001
Two-particle microrheology of quasi-2D viscous systems
V Prasad et al. Phys Rev Lett. 2006.
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 eta s. We observe a transition in the behavior of the correlated motion, from 2D 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. The scale factors used for the master curve allow for the calculation of the surface viscosity eta s that can be compared to one-particle measurements.
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