The liquid-glass-jamming transition in disordered ionic nanoemulsions

Abstract

In quenched disordered out-of-equilibrium many-body colloidal systems, there are important distinctions between the glass transition, which is related to the onset of nonergodicity and loss of low-frequency relaxations caused by crowding, and the jamming transition, which is related to the dramatic increase in elasticity of the system caused by the deformation of constituent objects. For softer repulsive interaction potentials, these two transitions become increasingly smeared together, so measuring a clear distinction between where the glass ends and where jamming begins becomes very difficult or even impossible. Here, we investigate droplet dynamics in concentrated silicone oil-in-water nanoemulsions using light scattering. For zero or low NaCl electrolyte concentrations, interfacial repulsions are soft and longer in range, this transition sets in at lower concentrations, and the glass and the jamming regimes are smeared. However, at higher electrolyte concentrations the interactions are stiffer, and the characteristics of the glass-jamming transition resemble more closely the situation of disordered elastic spheres having sharp interfaces, so the glass and jamming regimes can be distinguished more clearly.

Structure, Hydration, and Interactions of Native and Hydrophobically Modified Phytoglycogen Nanoparticles

“…These deviations are not surprising, given the soft, sticky, and charged nature of the OSA-modified particles. For example, it has been shown recently that the electrostatic repulsion of negatively charged nanoparticles can lead to solidification of particle dispersions at lower concentrations due to overlap of the Debye screening lengths for the particles. − Clearly, more complex models of the interactions between OSA-modified particles are required to accurately describe the S ( q ) data for concentrated dispersions in detail.…”

Relationship between rheology and structure of interpenetrating, deforming and compressing microgels

“…Emulsions, bubbles and other soft building blocks, on the other hand, can deform, allowing for ζ J ≤ ζ < 1. In this range the particles form flat facets at contact points which in turn store elastic energy [10][11][12], resulting in familiar soft pastes such as mayonnaise or shaving foam. Polymer microgels however are different.…”

Crossover between Athermal Jamming and the Thermal Glass Transition of Suspensions

“…The stress scale is found to be proportional to the thermal stress σ T ¼ αk B T=R 3 with α ¼ 35 000. The large prefactor α likely has to be attributed to the high entropic osmotic pressure that results from limited free volume for thermal motion [21,24,25]. A prefactor of order 10 4 can be calculated, e.g., from published MCT data for the thermal yield stress (ϕ ¼ 0.60, ϵ=k B T ¼ 10 5 − 10 7 ), while simulations in this case give α ∼ 10 3 [26].…”