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Issue 23, 2017
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Shear-induced reversibility of 2D colloidal suspensions in the presence of minimal thermal noise

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Abstract

The effects of minimal thermal noise on particle rearrangements in cyclically sheared colloidal suspensions are experimentally investigated using particle tracking methods. Our experimental model system consists of polystyrene microspheres adsorbed at an oil–water interface, in which the particles exhibit small but non-negligible Brownian motion. Experiments are performed on bidisperse (1.0 and 1.2 μm in diameter) systems, which form area fractions of 0.20 and 0.32 at the interface. We first characterize the thermal (Brownian) noise using particle diffusivities at quiescent states, and show that under our experimental flow conditions both systems (0.20 and 0.32 area fraction) behave as athermal, in the sense that the particle diffusion time scale is larger than the flow time scale. We then characterize particle rearrangements as a function of strain amplitude, and show that small but finite levels of thermal noise affect the reversibility dynamics, even in effectively athermal systems. Our data indicate that as thermal noise is slightly increased in a cyclically sheared athermal system, the fraction of reversible rearrangements is reduced, the reversible cycles become unstable, and the rearrangement hysteresis is significantly hindered.

Graphical abstract: Shear-induced reversibility of 2D colloidal suspensions in the presence of minimal thermal noise

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Publication details

The article was received on 13 Dec 2016, accepted on 08 Apr 2017 and first published on 10 Apr 2017


Article type: Paper
DOI: 10.1039/C6SM02772E
Citation: Soft Matter, 2017,13, 4278-4284
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    Shear-induced reversibility of 2D colloidal suspensions in the presence of minimal thermal noise

    S. Farhadi and P. E. Arratia, Soft Matter, 2017, 13, 4278
    DOI: 10.1039/C6SM02772E

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