Multiangle static and dynamic light scattering in the intermediate scattering angle range

Tamborini, Elisa; Cipelletti, Luca

doi:10.1063/1.4751864

Cited by 16 publications

(20 citation statements)

References 14 publications

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“…Light scattering is not limited to stucture identification and many light scattering-based methods have emerged in biology [10]. One of them is speckle analysis or dynamic light scattering (DLS), which was already well-established in soft matter [11][12][13]. In the multiple scattering regime, it has been used for functional imaging such as the measure of brain activity [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Structure and dynamics of multicellular assemblies measured by coherent light scattering

Brunel¹,

Blanch²,

Gourrier³

et al. 2017

New J. Phys.

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Section: Introductionmentioning

confidence: 99%

Structure and dynamics of multicellular assemblies measured by coherent light scattering

Brunel¹,

Blanch²,

Gourrier³

et al. 2017

New J. Phys.

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“…To provide a more quantitative account of the plasticity process, we couple the shear cell to a low-angle light scattering setup designed to access the characteristic length scale of the GB network [32]. We check that the apparatus is stable enough to reliably probe the dynamics over thousands of cycles [30].…”

Section: Introductionmentioning

confidence: 99%

Plasticity of a Colloidal Polycrystal under Cyclic Shear

2014

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We use confocal microscopy and time-resolved light scattering to investigate plasticity in a colloidal polycrystal, following the evolution of the network of grain boundaries as the sample is submitted to thousands of shear deformation cycles. The grain boundary motion is found to be ballistic, with a velocity distribution function exhibiting non-trivial power law tails. The shearinduced dynamics initially slow down, similarly to the aging of the spontaneous dynamics in glassy materials, but eventually reach a steady state. Surprisingly, the cross-over time between the initial aging regime and the steady state decreases with increasing probed length scale, hinting at a hierarchical organization of the grain boundary dynamics. The mechanical properties of amorphous solids are a topic of intense research. Recent works focus on the irreversible (or plastic) rearrangements at the microscopic level [1][2][3][4][5][6][7], resulting from an applied deformation or stress, which are ultimately responsible for the macroscopic mechanical behavior. Research on amorphous solids is also relevant to crystalline materials [8]. On the one hand, simulations and experiments have revealed that particles in the grain boundaries (GBs) separating crystalline grains exhibit glassy dynamics [9,10]. On the other hand, polycrystals may be regarded as an amorphous assembly of crystalline grains separated by GBs. In fact, driven polycrystals display mechanical features similar to those of amorphous solids [11] and GB process has been shown to be at the origin of the plasticity of polycrystals in the limit of small grain sizes [11][12][13][14][15].A large number of numerical works have explored the microscopic dynamics induced in amorphous systems by a continuous shear, finding quite generally diffusive dynamics at the particle level [1][2][3], once the affine component of the displacement is removed, as also confirmed by experiments on sheared colloidal glasses [2,7,16]. By contrast, the effect of a cyclic shear has been less investigated, in spite of its relevance to the fatigue tests commonly adopted in material science. Furthermore, cyclic deformation tests allow one to unambiguously identify irreversible rearrangements (as opposed to the non-affine displacement measured in continuous shear, which may be reversible) and to follow the evolution, or aging, of the dynamics as the sample is kept under an oscillatory deformation.Similarly to the case of continuous shear, the microscopic dynamics in cyclically deformed amorphous solids have been found to be diffusive (or even subdiffusive), in simulations [18,19] as well as in experiments on colloids [2,20] or granular matter [21,22]. Aging effects have been reported for macroscopic quantities, e.g. pressure or compacity [23,24], or for the microscopic dynamics. In the latter case, however, aging has been probed over a few tens of cycles at most [22,25].In this Letter, we report on experiments probing the irreversible rearrangements induced in a colloidal polycrystal by thousands of sh...

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“…Dynamic light scattering experiments are performed using the custom-made apparatus described in 43 , allowing simultaneous measurements at scattering angles in the range 0.4 deg ≤ θ ≤ 25 deg, corresponding to scattering vectors q = 2k sin θ /2 in the range 0.1 µm −1 ≤ q ≤ 5 µm −1 , where k = 2πnλ −1 is the wave vector of the incoming beam, with n the refractive index of the solvent and λ = 0.633 µm the in-vacuo wave length of the laser source. A simplified scheme of the DLS apparatus is shown in Fig.…”

Section: Small-angle Dls Apparatusmentioning

confidence: 99%

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

Aime

Cipelletti

2019

Soft Matter

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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.

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Multiangle static and dynamic light scattering in the intermediate scattering angle range

Cited by 16 publications

References 14 publications

Structure and dynamics of multicellular assemblies measured by coherent light scattering

Structure and dynamics of multicellular assemblies measured by coherent light scattering

Plasticity of a Colloidal Polycrystal under Cyclic Shear

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

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