Laser tweezer microrheology of a colloidal suspension.

@article{meyer06, abstract = {The microrheology of a colloidal suspension is measured using laser tweezers. Suspensions of refractive index-matched fluorinated ethylene propylene (FEP) particles are seeded with index-mismatched polystyrene or silica probe particles. Laser trapped probes are then subjected to steady uniform flows, enabling measurements of the suspension microviscosity as a function of FEP volume fraction and flow velocity. The microrheology results agree with bulk rheology, and both exhibit the same volume fraction dependence of the Krieger-Dougherty relationship for hard spheres. As volume fraction increases, the microrheology more closely agrees with the infinite shear bulk viscosity. In this regime, measurements using small probes exhibit additional shear thinning. Using confocal microscopy and fluorescent poly(methylmethacrylate) dispersions, we demonstrate that the nonlinear microrheology is consistent with the development of an anisotropic nonequilibrium pair distribution function between the}, author = {Meyer, Alexander and Marshall, Andrew and Bush, Brian G. and Furst, Eric M. }, citeulike-article-id = {1574445}, journal = {Journal of Rheology}, keywords = {confocal, laser-tweezer, microrheology, poking}, number = {1}, posted-at = {2007-09-29 03:43:35}, priority = {4}, title = {Laser tweezer microrheology of a colloidal suspension.}, url = {http://search.ebscohost.com/login.aspx?direct=true\&\#38;db=a9h\&\#38;AN=23074328\&\#38;site=ehost-live}, volume = {50}, year = {2006} }

TY - JOUR ID - meyer06 L3 - citeulike-article-id:1574445 TI - Laser tweezer microrheology of a colloidal suspension. JF - Journal of Rheology VL - 50 IS - 1 N2 - The microrheology of a colloidal suspension is measured using laser tweezers. Suspensions of refractive index-matched fluorinated ethylene propylene (FEP) particles are seeded with index-mismatched polystyrene or silica probe particles. Laser trapped probes are then subjected to steady uniform flows, enabling measurements of the suspension microviscosity as a function of FEP volume fraction and flow velocity. The microrheology results agree with bulk rheology, and both exhibit the same volume fraction dependence of the Krieger-Dougherty relationship for hard spheres. As volume fraction increases, the microrheology more closely agrees with the infinite shear bulk viscosity. In this regime, measurements using small probes exhibit additional shear thinning. Using confocal microscopy and fluorescent poly(methylmethacrylate) dispersions, we demonstrate that the nonlinear microrheology is consistent with the development of an anisotropic nonequilibrium pair distribution function between the KW - confocal KW - laser-tweezer KW - microrheology KW - poking AU - Meyer, Alexander AU - Marshall, Andrew AU - Bush, Brian AU - Furst, Eric PY - 2006/// UR - http://search.ebscohost.com/login.aspx?direct=true&db=a9h&AN=23074328&site=ehost-live ER -