Pattern formation in colloidal explosions

Details Pattern formation in colloidal explosions Pattern formation in colloidal explosions

2010-09-10

arxiv.org/abs/1009.1930v2

Europhys. Lett. 94, 48008 (2011)

Physics

Condensed Matter

Soft Condensed Matter

New restructured version (supplementary material goes into main text, no change of content), added journal reference and DOI i

Scientific paper

10.1209/0295-5075/94/48008

We study the non-equilibrium pattern formation that emerges when magnetically repelling colloids, trapped by optical tweezers, are abruptly released, forming colloidal explosions. For multiple colloids in a single trap we observe a pattern of expanding concentric rings. For colloids individually trapped in a line, we observe explosions with a zigzag pattern that persists even when magnetic interactions are much weaker than those that break the linear symmetry in equilibrium. Theory and computer simulations quantitatively describe these phenomena both in and out of equilibrium. An analysis of the mode spectrum allows us to accurately quantify the non-harmonic nature of the optical traps. Colloidal explosions provide a new way to generate well-characterized non-equilibrium behaviour in colloidal systems.

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