2016
DOI: 10.1088/1742-5468/2016/08/084004
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Crystallisation driven by sedimentation: a particle resolved study

Abstract: Abstract. We investigate the effects of the reversal of the gravitational field onto a sedimented and partially crystallised suspension of nearly-hard sphere colloids. We analyse the structural changes that take place during the melting of the crystalline regions and the reorganisation and assembly of the sedimenting particles. Through a comparison with numerical simulation, we access the single-particle kinetics and identify the key structural mechanism in the competition between five-fold symmetric and cubic… Show more

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Cited by 5 publications
(4 citation statements)
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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%
“…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%
“…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%
“…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%