Glass transition of soft colloids

Physical Review. E
Adrian-Marie PhilippeLuca Cipelletti

Abstract

We explore the glassy dynamics of soft colloids using microgels and charged particles interacting by steric and screened Coulomb interactions, respectively. In the supercooled regime, the structural relaxation time τ_{α} of both systems grows steeply with volume fraction, reminiscent of the behavior of colloidal hard spheres. Computer simulations confirm that the growth of τ_{α} on approaching the glass transition is independent of particle softness. By contrast, softness becomes relevant at very large packing fractions when the system falls out of equilibrium. In this nonequilibrium regime, τ_{α} depends surprisingly weakly on packing fraction, and time correlation functions exhibit a compressed exponential decay consistent with stress-driven relaxation. The transition to this novel regime coincides with the onset of an anomalous decrease in local order with increasing density typical of ultrasoft systems. We propose that these peculiar dynamics results from the combination of the nonequilibrium aging dynamics expected in the glassy state and the tendency of colloids interacting through soft potentials to refluidize at high packing fractions.

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Citations

Oct 8, 2019·Soft Matter·Giovanni Del MonteEmanuela Zaccarelli
Nov 27, 2019·Proceedings of the National Academy of Sciences of the United States of America·Simone CiarellaLiesbeth M C Janssen
Feb 23, 2020·Soft Matter·Ryan Poling-SkutvikChinedum O Osuji
Aug 4, 2020·Soft Matter·Nafisa BegamFrank Schreiber
Jan 23, 2020·Physical Review. E·Natsuda KlongvessaMathieu Leocmach
Nov 16, 2018·Scientific Reports·Ruben Higler, Joris Sprakel
Jan 11, 2020·Physical Review Letters·Natsuda KlongvessaMathieu Leocmach
Oct 27, 2020·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Giovanni Del MonteEmanuela Zaccarelli
Feb 2, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·S FrancoR Angelini
Mar 17, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·J Galen Wang, Roseanna N Zia
May 1, 2021·Polymers·Simona SennatoDomenico Truzzolillo
May 1, 2021·International Journal of Molecular Sciences·Silvia FrancoRoberta Angelini
Aug 1, 2021·Journal of Colloid and Interface Science·Qi LiGregory B McKenna
Oct 28, 2019·Macromolecules·Andrea NinarelloEmanuela Zaccarelli
Apr 9, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Ruben HiglerJoris Sprakel
Aug 21, 2021·Physical Review. E·Lara FrenzelFelix Lehmkühler
Aug 23, 2019·The Journal of Physical Chemistry Letters·Lara FrenzelGerhard Grübel

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