One- and two-particle microrheology

被引:276
作者
Levine, AJ [1 ]
Lubensky, TC [1 ]
机构
[1] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA
关键词
D O I
10.1103/PhysRevLett.85.1774
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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.
引用
收藏
页码:1774 / 1777
页数:4
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