Formation of a transient amorphous solid in low density aqueous charged sphere suspensions

Abstract

Colloidal glasses form from hard spheres, nearly hard spheres, ellipsoids and platelets or their attractive variants have been studied in detail. Complementing and checking theoretical approaches and simulations, the many different types of model systems have significantly advanced our understanding of the glass transition in general. Despite their early prediction, however, no experimental charged sphere glasses have been found at low density, where the competing process of crystallization prevails. We here report the formation of a transient amorphous solid formed from charged polymer spheres suspended in thoroughly deionized water at volume fractions of 0.0002-0.01. From optical experiments, we observe the presence of short-range order and an enhanced shear rigidity as compared to the stable polycrystalline solid of body centred cubic structure. On a density dependent time scale of hours to days, the amorphous solid transforms into this stable structure. We further present preliminary dynamic light scattering data showing the evolution of a second slow relaxation process possibly pointing to a dynamic heterogeneity known from other colloidal glasses and gels.We compare our findings to the predicted phase behaviour of charged sphere suspensions and discuss possible mechanisms for the formation of this peculiar type of colloidal glass.

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References in corpus (26)

• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture I: The van Hove Correlation Function
• Electrostatic correlations: from Plasma to Biology
• The Physics of the Colloidal Glass Transition
• Testing Mode-Coupling Theory for a Supercooled Binary Lennard-Jones Mixture II: Intermediate Scattering Function and Dynamic Susceptibility
• Dynamics on the Way to Forming Glass: Bubbles in Space-time
• The role of local structure in dynamical arrest
• Probing the equilibrium dynamics of colloidal hard spheres above the mode-coupling glass transition
• Precursor-mediated crystallization process in suspensions of hard spheres
• Understanding fragility in supercooled Lennard-Jones mixtures. I. Locally preferred structures
• Direct measurements of growing amorphous order and non-monotonic dynamic correlations in a colloidal glass-former
• Multiple nonergodic disordered states in Laponite suspensions: a phase diagram
• Structural and dynamical features of multiple metastable glassy states in a colloidal system with competing interactions
• The glass transition and the Coulomb gap in electron glasses
• An introduction to the colloidal glass transition
• Mean field theory for the three-dimensional Coulomb glass
• Independent Ion Migration in Suspensions of Strongly Interacting Charged Colloidal Spheres
• Strong geometric frustration in model glassformers
• Phase behaviour of deionized binary mixtures of charged colloidal spheres
• Shape of Dynamical Heterogeneities and the Stokes-Einstein and Stokes-Einstein-Debye Relations in Suspensions of Colloidal Ellipsoids
• Complete description of re-entrant phase behaviour in a charge variable colloidal model system
• Numerical Investigation of Glassy Dynamics in Low Density Systems
• Glass-Transition Properties from Hard Spheres to Charged Point Particles
• Arrest of flow and emergence of activated processes at the glass transition of a suspension of particles with hard sphere-like interactions
• Polymer-Enforced Crystallization of a Eutectic Binary Hard Sphere Mixture
• Manifestation of Random First Order Transition theory in Wigner glasses
• An Empirical Correction for Moderate Multiple Scattering in Super-Heterodyne Light Scattering