Microrheological Characterisation of Anisotropic Materials

Details Microrheological Characterisation of Anisotropic Materials Microrheological Characterisation of Anisotropic Materials

2005-06-06

arxiv.org/abs/cond-mat/0506131v3

Phys. Rev. E 73 031901 (2006)

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures. Replaced after refereeing/ improvement. Main results are the same. The final, published version of the pap

Scientific paper

10.1103/PhysRevE.73.031901

We describe the measurement of anisotropic viscoelastic moduli in complex soft materials, such as biopolymer gels, via video particle tracking microrheology of colloid tracer particles. The use of a correlation tensor to find the axes of maximum anisotropy, and hence the mechanical director, is described. The moduli of an aligned DNA gel are reported, as a test of the technique; this may have implications for high DNA concentrations in vivo. We also discuss the errors in microrheological measurement, and describe the use of frequency space filtering to improve displacement resolution, and hence probe these typically high modulus materials.

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