Frustration of structural fluctuations upon equilibration of shear melts

Schöpe, Hans Joachim; Palberg, Thomas

doi:10.1016/s0022-3093(02)01512-0

Cited by 15 publications

(30 citation statements)

References 41 publications

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“…The slowing of the increase in J at elevated concentration is therefore solely attributed to an increased interfacial free energy, [207]. [118,207,249 ]. In the quoted lab codes, PTFE denotes polytetrafluoroethylene particles, PS denotes polystyrene particles and PnBAPS denotes polystyrene-poly-nbutylacrylamide copolymer particles.…”

Section: Homogeneous Nucleation Rates For Highly Charged Spheresmentioning

confidence: 99%

Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives

Palberg

2014

J. Phys.: Condens. Matter

129

132

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Colloidal model systems allow studying crystallization kinetics under fairly ideal conditions, with rather well-characterized pair interactions and minimized external influences. In complementary approaches experiment, analytic theory and simulation have been employed to study colloidal solidification in great detail. These studies were based on advanced optical methods, careful system characterization and sophisticated numerical methods. Over the last decade, both the effects of the type, strength and range of the pair-interaction between the colloidal particles and those of the colloid-specific polydispersity have been addressed in a quantitative way. Key parameters of crystallization have been derived and compared to those of metal systems. These systematic investigations significantly contributed to an enhanced understanding of the crystallization processes in general. Further, new fundamental questions have arisen and (partially) been solved over the last decade: including, for example, a two-step nucleation mechanism in homogeneous nucleation, choice of the crystallization pathway, or the subtle interplay of boundary conditions in heterogeneous nucleation. On the other hand, via the application of both gradients and external fields the competition between different nucleation and growth modes can be controlled and the resulting microstructure be influenced. The present review attempts to cover the interesting developments that have occurred since the turn of the millennium and to identify important novel trends, with particular focus on experimental aspects.

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Section: Homogeneous Nucleation Rates For Highly Charged Spheresmentioning

confidence: 99%

Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives

Palberg

2014

J. Phys.: Condens. Matter

129

132

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“…While one component charged and hard silica spheres show a structural signature comparable to that of HS, they display a different evolution of the dynamics and some differences in the q-dependence of the non-ergodicity parameter [104]. index matched suspensions of perfluorinated charged latex beads [105]. They observed the nucleation rate density to increase exponentially with increasing particle number density up to the largest investigated volume fractions.…”

Section: The Topological Approachmentioning

confidence: 99%

To make a glass—avoid the crystal

Palberg¹,

Bartsch²,

Beyer³

et al. 2016

J. Stat. Mech.

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Colloidal model systems allow for a flexible tuning of particle sizes, particle spacings and mutual interactions at constant temperature. Colloidal suspensions typically crystallize as soon as the interactions get sufficiently strong and long-ranged. Several strategies have been successfully applied to avoid crystallization and instead produce colloidal glasses. Most of these amorphous solids are formed at high particle concentrations. This paper shortly reviews experimental attempts to produce amorphous colloidal solids using strategies based on topological, thermodynamic and kinetic considerations. We complement this overview by introducing a (transient) amorphous solid forming in a thoroughly deionized aqueous suspension of highly charged spheres at low salt concentration and very low volume fractions.

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“…Their formation, stability and properties are of fundamental interest [1][2][3][4][5][6][7] but moreover play a decisive role in practical processes, like gelation, coating or food processing [8,9]. Clusters also appear as embedded ensembles in colloidal (shear-)melts during the initial steps of freezing [10,11] and vitrification [12]. Unlike in condensation problems, here the differences between cluster and melt properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

Equilibrium fluid-crystal interfacial free energy of bcc-crystallizing aqueous suspensions of polydisperse charged spheres

2016

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The interfacial free energy is a central quantity in crystallization from the metastable melt. In suspensions of charged colloidal spheres, nucleation and growth kinetics can be accurately measured from optical experiments. In previous work, from these data effective nonequilibrium values for the interfacial free energy between the emerging bcc nuclei and the adjacent melt in dependence on the chemical potential difference between melt phase and crystal phase were derived using classical nucleation theory (CNT). A strictly linear increase of the interfacial free energy was observed as a function of increased metastability. Here, we further analyze these data for five aqueous suspensions of charged spheres and one binary mixture. We utilize a simple extrapolation scheme and interpret our findings in view of Turnbull's empirical rule. This enables us to present the first systematic experimental estimates for a reduced interfacial free energy, σ(0,bcc), between the bcc-crystal phase and the coexisting equilibrium fluid. Values obtained for σ(0,bcc) are on the order of a few k(B)T. Their values are not correlated to any of the electrostatic interaction parameters but rather show a systematic decrease with increasing size polydispersity and a lower value for the mixture as compared to the pure components. At the same time, σ(0) also shows an approximately linear correlation to the entropy of freezing. The equilibrium interfacial free energy of strictly monodisperse charged spheres may therefore be still greater.

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Frustration of structural fluctuations upon equilibration of shear melts

Cited by 15 publications

References 41 publications

Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives

Crystallization kinetics of colloidal model suspensions: recent achievements and new perspectives

To make a glass—avoid the crystal

Equilibrium fluid-crystal interfacial free energy of bcc-crystallizing aqueous suspensions of polydisperse charged spheres

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