Two-Particle Microrheology of Quasi-2D Viscous Systems

by: V Prasad, SA Koehler, Eric R Weeks

Physical Review Letters, Vol. 97, No. 17. (2006), 176001.

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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 s. We observe a transition in the behavior of the correlated motion, from 2D interface dominated at high s to bulk fluid dependent at low 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 s that can be compared to one-particle measurements.

@article{prasad06, 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 s. We observe a transition in the behavior of the correlated motion, from 2D interface dominated at high s to bulk fluid dependent at low 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 s that can be compared to one-particle measurements.}, author = {Prasad, V. and Koehler, S. A. and Weeks, Eric R. }, citeulike-article-id = {1676532}, doi = {10.1103/PhysRevLett.97.176001}, journal = {Physical Review Letters}, keywords = {2d, diffusion, interface, microrheology, two-point}, number = {17}, pages = {176001+}, posted-at = {2007-09-19 17:36:29}, priority = {0}, publisher = {APS}, title = {Two-Particle Microrheology of Quasi-2D Viscous Systems}, url = {http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal\&id=PRLTAO000097000017176001000001\&idtype=cvips\&gifs=yes}, volume = {97}, year = {2006} }

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TY - JOUR ID - prasad06 L3 - citeulike-article-id:1676532 TI - Two-Particle Microrheology of Quasi-2D Viscous Systems JF - Physical Review Letters VL - 97 IS - 17 SP - 176001 PB - APS N2 - 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 s. We observe a transition in the behavior of the correlated motion, from 2D interface dominated at high s to bulk fluid dependent at low 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 s that can be compared to one-particle measurements. KW - 2d KW - diffusion KW - interface KW - microrheology KW - two-point AU - Prasad, V AU - Koehler, SA AU - Weeks, Eric PY - 2006/// UR - http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id=PRLTAO000097000017176001000001&idtype=cvips&gifs=yes ER -

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