2005/06/30 by I A Hasnain, I. A. Hasnain, Athene M. Donald +1 · 57 citations
Chemical Engineering · Materials Science · Physics and Astronomy · #Anisotropy #Characterization (materials science) #Force Microscopy Techniques and Applications #Material Dynamics and Properties #Materials science #Nanotechnology #Optics #Physics #Rheology and Fluid Dynamics Studies #cond-mat.soft
paper · pdf · doi:10.1103/physreve.73.031901
published in Physical Review E 73(3), 031901 (American Physical Society) · 5 pages, 5 figures. Replaced after refereeing/ improvement. Main results are the same. The final, published version of the paper is here http://link.aps.org/abstract/PRE/v73/e031901
openalex publication_date 2006/03/02 · arxiv created 2006/03/03 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 without prior knowledge, and hence the mechanical director, is described. The moduli of an aligned DNA gel are reported, as an application 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.