Polyhedral colloidal `rocks': low-dimensional networks

Details Polyhedral colloidal `rocks': low-dimensional networks Polyhedral colloidal `rocks': low-dimensional networks

2011-11-28

arxiv.org/abs/1111.6568v2

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1039/c1sm06663c

We introduce a model system of anisotropic colloidal `rocks'. Due to their shape, the bonding introduced via non-absorbing polymers is profoundly different from spherical particles: bonds between rocks are rigid against rotation, leading to strong frustration. We develop a geometric model which captures the essence of the rocks. Experiments and simulations show that the colloid geometry leads to structures of low fractal dimension. This is in stark contrast to gels of spheres, whose rigidity results from locally dense regions. At high density the rocks form a quasi one-component glass.

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