Colloidal Flying Carpets

Details Colloidal Flying Carpets Colloidal Flying Carpets

2009-06-17

arxiv.org/abs/0906.3137v1

Physics

Condensed Matter

Soft Condensed Matter

submitted to PRL

Scientific paper

DNA plays a special role in polymer science not just because of the highly selective recognition of complementary single DNA strands but also because bacteria can express DNA chains that are very long yet perfectly monodisperse. The latter reason makes long DNA molecules widely used as model systems in polymer science. Here, we report the unusual self-assembly that takes place in systems of colloids coated with very long double-stranded DNA. In particular, we find that colloids coated with such long DNA can assemble into unique floating crystalline monolayers. Floating colloidal structures have potentially interesting applications as such ordered structures can be assembled in one location and then deposited somewhere else. This would open the way to the assembly of multi-component, layered colloidal crystals.

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