Simultaneous measurement of the microscopic dynamics and the mesoscopic displacement field in soft systems by speckle imaging
arXiv:1306.4073 · doi:10.1364/OE.21.022353
Abstract
The constituents of soft matter systems such as colloidal suspensions, emulsions, polymers, and biological tissues undergo microscopic random motion, due to thermal energy. They may also experience drift motion correlated over mesoscopic or macroscopic length scales, \textit{e.g.} in response to an internal or applied stress or during flow. We present a new method for measuring simultaneously both the microscopic motion and the mesoscopic or macroscopic drift. The method is based on the analysis of spatio-temporal cross-correlation functions of speckle patterns taken in an imaging configuration. The method is tested on a translating Brownian suspension and a sheared colloidal glass.
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- Role of normal stress in the creep dynamics and failure of a biopolymer gel
- Uncovering the dynamic precursors to motor-driven contraction of active gels
- RheoSpeckle: a new tool to investigate local flow and microscopic dynamics of soft matter under shear
- Multispeckle diffusing wave spectroscopy as a tool to study heterogeneous mechanical behavior in soft solids