Crystallisation driven by sedimentation: a particle resolved study

Turci, Francesco; Royall, C. Patrick

doi:10.1088/1742-5468/2016/08/084004

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…To estimate σ eff under our experimental conditions, we apply a method similar to the one used in Ref. [52]. In this study, the authors matched the pair correlation function g(r) of dense hard spheres with the known Percus-Yevick expression by varying the effective diameter σ eff .…”

Section: A Experimentsmentioning

confidence: 99%

Coupling between criticality and gelation in “sticky” spheres: a structural analysis

et al. 2018

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We combine experiments and simulations to study the link between criticality and gelation in sticky spheres. We employ confocal microscopy to image colloid-polymer mixtures and Monte Carlo simulations of the square-well (SW) potential as a reference model. To this end, we map our experimental samples onto the SW model. We find an excellent structural agreement between experiments and simulations, both for locally favored structures at the single particle level and large-scale fluctuations at criticality. We follow in detail the rapid structural change in the critical fluid when approaching the gas-liquid binodal and highlight the role of critical density fluctuations for this structural crossover. Our results link the arrested spinodal decomposition to long-lived energetically favored structures, which grow even away from the binodal due to the critical scaling of the bulk correlation length and static susceptibility.

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Section: A Experimentsmentioning

confidence: 99%

Coupling between criticality and gelation in “sticky” spheres: a structural analysis

et al. 2018

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“…It has been proposed that upon cooling, icosahedral-like arrangements of atoms might form in the glassformer [4] and that the dynamical arrest may be related to a (geometrically frustrated) transition to a phase of such icosahedra [5]. To test these ideas studies have been carried out to identify geometric motifs such as icosahedra and related locally favored structures (LFS) by means of computer simulation [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] and particle-resolved experiments on colloids [21][22][23][24][25][26][27][28]. Other, so-called order agnostic approaches show similar behaviour [29,30,31,32,33,42] Further experimental evidence of increasing numbers of LFS upon cooling is also found in metallic glassformers [34,35].…”

Section: Introductionmentioning

confidence: 99%

Locally favoured structures and dynamic length scales in a simple glass-former

Royall¹,

Kob²

2017

J. Stat. Mech.

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We investigate the static and dynamic properties of a weakly polydisperse hard sphere system in the deeply supercooled state, i.e. at densities higher than that corresponding to the mode-coupling transition. The structural analysis reveals the emergence of icosahedral locally favoured structures, previously only found in trace quantities. We present a new approach to probe the shape of dynamically heterogeneous regions, which is insensitive to particle packing eects that can hamper such analysis. Our results indicate that the shape of the dynamically heterogeneous regions changes only weakly and moreover hint that the often-used four-point correlation length may exhibit a growth in excess of that which our method identifies. The growth of the size of the dynamically heterogeneous regions appears instead to be in line with the one of structural and dynamic propensity correlations.

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“…To that end, we study both the crystallinity and the density at the single particle level by means of confocal microscopy. So far, few quantitative studies of the effect of gravity on crystal nucleation that stem from real time and space experiments have been reported 21 . We find that crystal nucleation is significantly enhanced during sedimentation, irrespective of the initial volume fraction at which the system is prepared.…”

Section: Introductionmentioning

confidence: 99%

Crystal nucleation in sedimenting colloidal suspensions

Ketzetzi¹,

Russo

Bonn³

2018

The Journal of Chemical Physics

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Homogeneous crystal nucleation from a metastable hard-sphere colloidal liquid has been extensively studied in simulations and experiments. A 12 order of magnitude difference between simulated and experimental nucleation rates is observed, the origin of which remains a puzzle. Here, we experimentally study crystal nucleation at the single particle level in suspensions of hard-sphere-like colloids under the influence of sedimentation. We find that sedimentation significantly enhances the nucleation rate, but contrary to what was previously thought, this is not due to simple density fluctuations, as the nucleation barriers become independent of the local density in a sedimentating fluid. Instead, we find an enhancement of the local dynamics, which suggests that local convective cells are responsible for shear-enhanced crystallization at low volume fractions.

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Crystallisation driven by sedimentation: a particle resolved study

Cited by 4 publications

References 41 publications

Coupling between criticality and gelation in “sticky” spheres: a structural analysis

Coupling between criticality and gelation in “sticky” spheres: a structural analysis

Locally favoured structures and dynamic length scales in a simple glass-former

Crystal nucleation in sedimenting colloidal suspensions

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