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Probing shear-induced rearrangements in Fourier space. I. Dynamic light scattering

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Abstract

Understanding the microscopic origin of the rheological behavior of soft matter is a long-lasting endeavour. While early efforts concentrated mainly on the relationship between rheology and structure, current research focuses on the role of microscopic dynamics. We present in two companion papers a thorough discussion of how Fourier space-based methods may be coupled to rheology to shed light on the relationship between the microscopic dynamics and the mechanical response of soft systems. In this first companion paper, we report a theoretical, numerical and experimental investigation of dynamic light scattering coupled to rheology. While in ideal solids and simple viscous fluids the displacement field under a shear deformation is purely affine, additional non-affine displacements arise in many situations of great interest, for example in elastically heterogeneous materials or due to plastic rearrangements. We show how affine and non-affine displacements can be separately resolved by dynamic light scattering, and discuss in detail the effect of several non-idealities in typical experiments.

Graphical abstract: Probing shear-induced rearrangements in Fourier space. I. Dynamic light scattering

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Publication details

The article was received on 01 Aug 2018, accepted on 19 Nov 2018 and first published on 20 Nov 2018


Article type: Paper
DOI: 10.1039/C8SM01563E
Citation: Soft Matter, 2019, Advance Article
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    Probing shear-induced rearrangements in Fourier space. I. Dynamic light scattering

    S. Aime and L. Cipelletti, Soft Matter, 2019, Advance Article , DOI: 10.1039/C8SM01563E

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