Microrheological characterization of anisotropic materials
Microrheological characterization of anisotropic materials
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DOI：
10.1103/physreve.73.031901
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发表时间：
2006-03-01
影响因子：
2.4
通讯作者：
Donald, AM
中科院分区：
文献类型：
--
作者：
Hasnain, IA;Donald, AM
我们描述了在复杂的软材料，如生物聚合物凝胶，通过视频粒子跟踪胶体示踪粒子的微观流变学的各向异性粘弹性模量的测量。使用的相关张量，找到轴的最大各向异性没有先验知识，因此机械导演，进行了说明。对齐的DNA凝胶的模量的报告，作为该技术的应用，这可能会影响体内的高DNA浓度。我们还讨论了微流变测量中的误差，并描述了使用频率空间滤波来提高位移分辨率，从而探测这些典型的高模量材料。
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.