Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2011-11-16
Physics
Condensed Matter
Soft Condensed Matter
Accepted in Soft Matter. 12 pages, 12 figures
Scientific paper
We investigate the thermodynamics and percolation regimes of model binary mixtures of patchy colloidal particles. The particles of each species have three sites of two types, one of which promotes bonding of particles of the same species while the other promotes bonding of different species. We find up to four percolated structures at low temperatures and densities: two gels where only one species percolates, a mixed gel where particles of both species percolate but neither species percolates separately, and a bicontinuous gel where particles of both species percolate separately forming two interconnected networks. The competition between the entropy and the energy of bonding drives the stability of the different percolating structures. Appropriate mixtures exhibit one or more connectivity transitions between the mixed and bicontinuous gels, as the temperature and/or the composition changes.
da Gama Margarida M. Telo
las Heras Daniel de
Tavares José Maria
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