Connecting short and long time dynamics in hard-sphere-like colloidal glasses

Pastore, Raffaele; Ciamarra, Massimo Pica; Pesce, Giuseppe; Sasso, Antonio

doi:10.1039/c4sm02147a

Cited by 23 publications

(36 citation statements)

References 35 publications

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“…In hard-sphere colloidal systems, its correlations with cooperative motion of particles in small clusters 14 and with the jump of particles to different cages 20 are discussed. Activation of such particle motions could cause structural rearrangements and accelerate crystallization.…”

Section: Resultsmentioning

confidence: 99%

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Accelerated crystallization of colloidal glass by mechanical oscillation

Nakamura

Inayama

Okuno

et al. 2017

Sci Rep

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Crystallization of a hard-sphere colloidal glass by mechanical oscillation is investigated, and accelerated crystallization is found at a specific frequency. The crystallization frequency increases as attractive force between particles increases, indicating that interparticle interaction affects the crystallization frequency. Time scale of the mechanical oscillation is different from that of the slow relaxation, and notable relationship with the low-frequency mode is not observed. The experimental results are not explained by the previously proposed model for crystallization by oscillatory shear. Conversely, we speculate that activations of the fast relaxation and particle motion in crystal-like clusters are possible causes of the observations.

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Section: Resultsmentioning

confidence: 99%

“…In colloidal glasses, the low-frequency mode 17–19 , analogous to the Boson peak, is observed. Particle motion in cages and a jump to a different cage are also observed 14, 20 . Thus, colloidal systems can be model materials for studying dynamic properties of atomic materials.…”

Section: Introductionmentioning

confidence: 89%

Accelerated crystallization of colloidal glass by mechanical oscillation

Nakamura

Inayama

Okuno

et al. 2017

Sci Rep

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“…Here we show that the jumps we have identified are irreversible, and we give evidence suggesting that these can be considered as 'elementary' irreversible events, i.e that they are the smallest irreversible single-particle move, at least in the range of parameters we have investigated. Investigating both the model considered here 32 , as well as the 3d Kob-Andersen Lennard-Jones (3d KA LJ) binary mixture 34 and experimental colloidal glass 35 , we have previously shown that the protocol defined in Sec. 2 leads to the identification of irreversible events.…”

Section: Jumps As Irreversible Elementary Processesmentioning

confidence: 99%

Spatial correlations of elementary relaxation events in glass-forming liquids

2015

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The dynamical facilitation scenario, by which localized relaxation events promote nearby relaxation events in an avalanching process, has been suggested as the key mechanism connecting the microscopic and the macroscopic dynamics of structural glasses. Here we investigate the statistical features of this process via the numerical simulation of a model structural glass. First we show that the relaxation dynamics of the system occurs through particle jumps that are irreversible, and that cannot be decomposed in smaller irreversible events. Then we show that each jump does actually trigger an avalanche. The characteristic of this avalanche change on cooling, suggesting that the relaxation dynamics crossovers from a noise dominated regime where jumps do not trigger other relaxation events, to a regime dominated by the facilitation process, where a jump trigger more relaxation events.

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“…It is known that in the case of molecular liquids and hard-sphere-like colloidal glasses, on approaching the glass transition to an amorphous solid-like state, the dynamic becomes intermittent and shows large spatiotemporal fluctuations, also known as dynamic heterogeneities 56,57 . The dynamic is spatiotemporal heterogeneous since the probability that a particle rearranges in a given time interval is not spatially uniform, as long as the considered time interval is smaller than the relaxation time.…”

Section: Resultsmentioning

confidence: 99%

Dynamic heterogeneity in an orientational glass

Caballero

Zuriaga

Tamarit³

et al. 2017

The Journal of Chemical Physics

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Family of compounds CBr n Cl 4−n has been proven helpful in unraveling microscopic mechanisms responsible of glassy behavior. Some of the family members show translational ordered phases with minimal disorder which appears to reveal glassy features, thus deserving special attention in the search for universal glass anomalies. In this work, we studied CBrCl 3 dynamics by performing extensive molecular dynamics simulations. Molecules of this compound perform reorientational discrete jumps, where the atoms exchange equivalent positions among each other revealing a cage-orientational jump motion fully comparable to the cage-rototranslational jump motion in supercooled liquids. Correlation times were calculated from rotational autocorrelation functions showing good agreement with previous reported dielectric results. From mean waiting and persistence times calculated directly from trajectory results, we are able to explain which microscopic mechanisms lead to characteristic times associated with α and β-relaxation times measured experimentally. We found that two nonequivalent groups of molecules have a longer characteristic time than the other two nonequivalent groups, both of them belonging to the asymmetric unit of the monoclinic (C2/c) lattice.

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Connecting short and long time dynamics in hard-sphere-like colloidal glasses

Cited by 23 publications

References 35 publications

Accelerated crystallization of colloidal glass by mechanical oscillation

Accelerated crystallization of colloidal glass by mechanical oscillation

Spatial correlations of elementary relaxation events in glass-forming liquids

Dynamic heterogeneity in an orientational glass

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