Center for Functional Nanomaterials Seminar

"Colloids + DNA: From Morphological Diversity to Programmable Self-Assembly"

Presented by Alexei Tkachenko, University of Michigan

Monday, October 17, 2005, 1:30 pm — Hamilton Seminar Room, Bldg. 555

We study theoretically self-assembly of colloidal particles with DNA-mediated interactions. In this class of systems, the sequence of ssDNA "markers" attached to a particle determines its type, and DNA "linkers" induce type-dependent interactions. Even in the simplest case of a binary mixture, the system is exhibits surprisingly diverse and unusual phase behaviour. Among the equilibrium morphologies are the diamond lattice, and the membrane phase with in-plane square order, a striking example of spontaneous compactification.

We have also studied the possibility of "programmable" self-assembly of mesoscopic clusters of such particles with type-dependent interactions. This scheme is reminiscent of heteropolymer folding problem (e.g. RNA or protein). However, thanks to relatively long-range DNA-mediated interactions the system is capable of reaching its ground state directly, without being arrested at any metastable configuration.

Hosted by: OLEG GANG

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