Local influence of boundary conditions on a confined supercooled colloidal liquid

Edmond, Kazem V.; Nugent, C. R.; Weeks, Eric R.

doi:10.1140/epjst/e2010-01311-3

Cited by 16 publications

(35 citation statements)

References 27 publications

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“…[19][20][21] The density (in colloidal samples) or temperature (in molecular liquids) at which the glass transition occurs is similarly dependent on the confining lengthscale and the boundary details. 10,19,[22][23][24] Through understanding and controlling the boundaries confining a system one can alter the energy landscape it experiences, offering new a) Electronic mail: ian.williams@bristol.ac.uk routes to self-assembly and control of reaction rates and crystal growth. 3,[25][26][27] The research described here is concerned with a twodimensional hard disc system.…”

Section: Introductionmentioning

confidence: 99%

The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs

Williams¹,

Oğuz

Jack

et al. 2014

The Journal of Chemical Physics

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The behaviour of materials under spatial confinement is sensitively dependent on the nature of the confining boundaries. In two dimensions, confinement within a hard circular boundary inhibits the hexagonal ordering observed in bulk systems at high density. Using colloidal experiments and Monte Carlo simulations, we investigate two model systems of quasi hard discs under circularly symmetric confinement. The first system employs an adaptive circular boundary, defined experimentally using holographic optical tweezers. We show that deformation of this boundary allows, and indeed is required for, hexagonal ordering in the confined system. The second system employs a circularly symmetric optical potential to confine particles without a physical boundary. We show that, in the absence of a curved wall, near perfect hexagonal ordering is possible. We propose that the degree to which hexagonal ordering is suppressed by a curved boundary is determined by the "strictness" of that wall.

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Section: Introductionmentioning

confidence: 99%

The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs

Williams¹,

Oğuz

Jack

et al. 2014

The Journal of Chemical Physics

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“…Experimentally, the colloidal glass transition shifts to lower volume fractions in confined samples: confinement makes colloidal samples glassier [22][23][24][25][26][27]. This has been studied exclusively in parallel-plate geometries, where samples are confined between two glass walls that are closely spaced.…”

Section: Introductionmentioning

confidence: 99%

Slow dynamics in cylindrically confined colloidal suspensions

Saklayen

Hunter

Edmond

et al. 2013

AIP Conference Proceedings

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Abstract. We study bidisperse colloidal suspensions confined within glass microcapillary tubes to model the glass transition in confined cylindrical geometries. We use high speed three-dimensional confocal microscopy to observe particle motions for a wide range of volume fractions and tube radii. Holding volume fraction constant, we find that particles move slower in thinner tubes. The tube walls induce a gradient in particle mobility: particles move substantially slower near the walls. This suggests that the confinement-induced glassiness may be due to an interfacial effect.

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“…However, the available experimental data for systems with equilibrium stratified density distributions do not agree with the predictions obtained from the analyses of Similarly, experimental studies by Edmond, Nugent and Weeks [6] of the single particle MSD in colloid suspensions confined between two flat plates with separations of a few particle diameters do not show any correlation between the MSD of a particle and the well-defined peaks in the transverse density distribution. We add to this data set with a report, in the appendix to this paper, of the results of a study of the azimuthal and radial single particle MSDs of a particle in a dense q2D colloid suspension confined in a small circular cavity.…”

Section: The Discrepancymentioning

confidence: 83%

A comment on the position dependent diffusion coefficient representation of structural heterogeneity

Wolfson

Liepold

Lin

et al. 2018

The Journal of Chemical Physics

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Experimental studies of the variation of the mean square displacement (MSD) of a particle in a confined colloid suspension that exhibits density variations on the scale length of the particle diameter are not in agreement with the prediction that the spatial variation in MSD should mimic the spatial variation in density. The predicted behavior is derived from the expectation that the MSD of a particle depends on the system density and the assumption that the force acting on a particle is a point function of position. The experimental data come from studies of the MSDs of particles in narrow ribbon channels and between narrowly spaced parallel plates, and from new data, reported herein, of the radial and azimuthal MSDs of a colloid particle in a dense colloid suspension confined to a small circular cavity. In each of these geometries a dense colloid suspension exhibits pronounced density oscillations with spacing of a particle diameter. We remove the discrepancy between prediction and experiment using the Fisher-Methfessel interpretation of how local equilibrium in an inhomogeneous system is maintained to argue that the force acting on a particle is delocalized over a volume with radius equal to a particle diameter. Our interpretation has relevance to the relationship between the scale of inhomogeneity and the utility of translation of the particle MSD into a position dependent diffusion coefficient, and to the use of a spatially dependent diffusion coefficient to describe mass transport in a heterogeneous system.

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Local influence of boundary conditions on a confined supercooled colloidal liquid

Cited by 16 publications

References 27 publications

The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs

The effect of boundary adaptivity on hexagonal ordering and bistability in circularly confined quasi hard discs

Slow dynamics in cylindrically confined colloidal suspensions

A comment on the position dependent diffusion coefficient representation of structural heterogeneity

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