“Microviscoelasticity” of colloidal dispersions.

@article{2307883620051101, abstract = {We study the motion of a Brownian probe particle subjected to a small amplitude oscillatory external force and immersed in a colloidal dispersion, as a theoretical benchmark for particle-tracking microrheology experiments. The application of an external force on the probe drives the microstructure of the dispersion out of equilibrium; opposing this is the Brownian diffusion of the probe and colloidal ``bath'' particles. The degree to which the microstructure is driven away from equilibrium is given by the nondimensional external force on the probe, or P{\'{e}}clet number, Pe. The nonequilibrium microstructure of the dispersion is calculated for small departures from equilibrium, i.e., to first order in Pe, and to leading order in the bath particle volume fraction, accounting for excluded volume and hydrodynamic interactions between particles. The nonequilibrium microstructure is used to calculate the average velocity of the probe, from which one may infer the complex microviscosity (or modulu}, author = {Khair, Aditya S. and Brady, John F. }, citeulike-article-id = {1574460}, journal = {Journal of Rheology}, keywords = {microrheology, simulation, theory}, number = {6}, posted-at = {2007-08-19 00:31:25}, priority = {2}, title = {``Microviscoelasticity'' of colloidal dispersions.}, url = {http://search.ebscohost.com/login.aspx?direct=true\&db=a9h\&AN=23078836\&site=ehost-live}, volume = {49}, year = {20051101} }

TY - JOUR ID - 2307883620051101 L3 - citeulike-article-id:1574460 TI - ``Microviscoelasticity'' of colloidal dispersions. JF - Journal of Rheology VL - 49 IS - 6 N2 - We study the motion of a Brownian probe particle subjected to a small amplitude oscillatory external force and immersed in a colloidal dispersion, as a theoretical benchmark for particle-tracking microrheology experiments. The application of an external force on the probe drives the microstructure of the dispersion out of equilibrium; opposing this is the Brownian diffusion of the probe and colloidal ``bath'' particles. The degree to which the microstructure is driven away from equilibrium is given by the nondimensional external force on the probe, or P{\'{e}}clet number, Pe. The nonequilibrium microstructure of the dispersion is calculated for small departures from equilibrium, i.e., to first order in Pe, and to leading order in the bath particle volume fraction, accounting for excluded volume and hydrodynamic interactions between particles. The nonequilibrium microstructure is used to calculate the average velocity of the probe, from which one may infer the complex microviscosity (or modulu KW - microrheology KW - simulation KW - theory AU - Khair, Aditya AU - Brady, John PY - 20051101/// UR - http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=23078836&site=ehost-live ER -