Abstract for an Invited Paper for the MAR11 Meeting of The American Physical Society Directed self-assembly of small colloidal clusters1
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for an Invited Paper for the MAR11 Meeting of The American Physical Society Directed self-assembly of small colloidal clusters1 VINOTHAN MANOHARAN, Harvard University We study the formation and structure of equilibrium colloidal clusters at small particle number (N ∼ 10) using optical microscopy. Our experimental system consists of isolated groups of colloidal microspheres with short-ranged attractions. With non-specific depletion interactions, we observe that the number of configurations increases sharply with N . The most favorable states are those with the lowest symmetry. With specific DNA-mediated attractions, the number of states is reduced. Experiments and theoretical calculations suggest that it is possible to direct the assembly of specific structures through multiple competing DNA-mediated interactions. 1We acknowledge support from the National Science Foundation under grant nos. DMR-0820484, ECS-0335765, and ECCS-0709323
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