Gel and glass transition in fragile colloidal clays

Abstract

Dynamic Light Scattering (DLS) measurements were performed on colloidal suspensions of Laponite\textsuperscript{\textregistered} at different concentrations in the range $C_{\text{w}}=(1.5÷3.0)$%. The slowing down of the dynamics induced by aging was monitored by following the temporal evolution of autocorrelation functions at different concentrations towards the gel and glass transition. Exploiting analogies with supercooled liquids approaching their glass transitions, an Angell plot for the structural relaxation times was drawn. Finally, the fragility of Laponite\textsuperscript{\textregistered} suspensions at different concentrations, in different solvents, at two salt concentrations and with the addition of a polymer was reported and discussed.

arXiv comment8 pages, 4 figures

References in corpus (15)

• Observation of empty liquids and equilibrium gels in a colloidal clay
• Evolution of particle-scale dynamics in an aging clay suspension
• The evolution of vibrational excitations in glassy systems
• Routes to gelation in a clay suspension
• Microstructure and Soft Glassy Dynamics of Aqueous Laponite Dispersion
• Multiple nonergodic disordered states in Laponite suspensions: a phase diagram
• Competing interactions in arrested states of colloidal clays
• Experimental observation of the intricate free-energy landscape for a soft glassy system
• Dichotomic Aging Behaviour in a Colloidal Glass
• Arrested state of clay-water suspensions: gel or glass?
• Study of network composition in interpenetrating polymer networks of poly(N isopropylacrylamide) microgels:the role of poly(acrylic acid)
• Structural and microscopic relaxations in a colloidal glass
• Aging in a Laponite colloidal suspension: A Brownian dynamics simulation study
• Structural and Microscopic Relaxation Processes in Liquid Hydrogen Fluoride
• Microscopic dynamics and relaxation processes in liquid Hydrogen Fluoride