Faculté des sciences

Dynamic arrest in charged colloidal systems exhibiting large-scale structural heterogeneities

Haro-Pérez, C. ; Rojas-Ochoa, Luis Fernando ; Castañeda-Priego, R. ; Quesada-Pérez, M. ; Callejas-Fernández, J. ; Hidalgo-Álvarez, R. ; Trappe, Véronique

In: Physical Review Letters, 2009, vol. 102, no. 1, p. 018301

Suspensions of charged liposomes are found to exhibit typical features of strongly repulsive fluid systems at short length scales, while exhibiting structural heterogeneities at larger length scales that are characteristic of attractive systems. We model the static structure factor of these systems using effective pair interaction potentials composed of a long-range attraction and a shorter range... Plus

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    Summary
    Suspensions of charged liposomes are found to exhibit typical features of strongly repulsive fluid systems at short length scales, while exhibiting structural heterogeneities at larger length scales that are characteristic of attractive systems. We model the static structure factor of these systems using effective pair interaction potentials composed of a long-range attraction and a shorter range repulsion. Our modeling of the static structure yields conditions for dynamically arrested states at larger volume fractions, which we find to agree with the experimentally observed dynamics.