One- and Two-Particle Microrheology

by: Alex J Levine, TC Lubensky

Physical Review Letters, Vol. 85, No. 8. (2000), 1774.

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Abstract

We study the dynamics of rigid spheres embedded in viscoelastic media and address two questions of importance to microrheology. First; we calculate the complete response to an external force of a single bead in a homogeneous elastic network viscously coupled to an incompressible fluid. From this response function we find the frequency range where the standard assumptions of microrheology are valid. Second; we study fluctuations when embedded spheres perturb the media around them and show that mutual fluctuations of two separated spheres provide a more accurate determination of the complex shear modulus than do the fluctuations of a single sphere.

@article{citeulike:822249, abstract = {We study the dynamics of rigid spheres embedded in viscoelastic media and address two questions of importance to microrheology. First; we calculate the complete response to an external force of a single bead in a homogeneous elastic network viscously coupled to an incompressible fluid. From this response function we find the frequency range where the standard assumptions of microrheology are valid. Second; we study fluctuations when embedded spheres perturb the media around them and show that mutual fluctuations of two separated spheres provide a more accurate determination of the complex shear modulus than do the fluctuations of a single sphere.}, author = {Levine, Alex J. and Lubensky, T. C. }, citeulike-article-id = {822249}, doi = {10.1103/PhysRevLett.85.1774}, journal = {Physical Review Letters}, keywords = {cooperative, diffusion, microrheology}, number = {8}, pages = {1774+}, posted-at = {2008-04-28 23:22:21}, priority = {2}, publisher = {American Physical Society}, title = {One- and Two-Particle Microrheology}, url = {http://dx.doi.org/10.1103/PhysRevLett.85.1774}, volume = {85}, year = {2000} }

RIS record

TY - JOUR ID - citeulike:822249 L3 - citeulike-article-id:822249 TI - One- and Two-Particle Microrheology JF - Physical Review Letters VL - 85 IS - 8 SP - 1774 PB - American Physical Society N2 - We study the dynamics of rigid spheres embedded in viscoelastic media and address two questions of importance to microrheology. First; we calculate the complete response to an external force of a single bead in a homogeneous elastic network viscously coupled to an incompressible fluid. From this response function we find the frequency range where the standard assumptions of microrheology are valid. Second; we study fluctuations when embedded spheres perturb the media around them and show that mutual fluctuations of two separated spheres provide a more accurate determination of the complex shear modulus than do the fluctuations of a single sphere. KW - cooperative KW - diffusion KW - microrheology AU - Levine, Alex AU - Lubensky, TC PY - 2000//21/ UR - http://dx.doi.org/10.1103/PhysRevLett.85.1774 ER -

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