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Science 7 May 1999:
Vol. 284. no. 5416, pp. 948 - 951
DOI: 10.1126/science.284.5416.948
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Reports

Design and Self-Assembly of Open, Regular, 3D Mesostructures

Tricia L. Breen, Joe Tien, Scott R. J. Oliver, Tanja Hadzic, George M. Whitesides *

Self-assembly provides the basis for a procedure used to organize millimeter-scale objects into regular, three-dimensional arrays ("crystals") with open structures. The individual components are designed and fabricated of polyurethane by molding; selected faces are coated with a thin film of liquid, metallic alloy. Under mild agitation in warm, aqueous potassium bromide solution, capillary forces between the films of alloy cause self-assembly. The structures of the resulting, self-assembled arrays are determined by structural features of the component parts: the three-dimensional shape of the components, the pattern of alloy on their surfaces, and the shape of the alloy-coated surfaces. Self-assembly of appropriately designed chiral pieces generates helices.

Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA.
*   To whom correspondence should be addressed.

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