Computer Science
Scientific paper
Feb 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009natur.457..999e&link_type=abstract
Nature, Volume 457, Issue 7232, pp. 999-1002 (2009).
Computer Science
25
Scientific paper
The assembly of complex structures out of simple colloidal building blocks is of practical interest for building materials with unique optical properties (for example photonic crystals and DNA biosensors) and is of fundamental importance in improving our understanding of self-assembly processes occurring on molecular to macroscopic length scales. Here we demonstrate a self-assembly principle that is capable of organizing a diverse set of colloidal particles into highly reproducible, rotationally symmetric arrangements. The structures are assembled using the magnetostatic interaction between effectively diamagnetic and paramagnetic particles within a magnetized ferrofluid. The resulting multipolar geometries resemble electrostatic charge configurations such as axial quadrupoles (`Saturn rings'), axial octupoles (`flowers'), linear quadrupoles (poles) and mixed multipole arrangements (`two tone'), which represent just a few examples of the type of structure that can be built using this technique.
Erb Randall M.
Rotello Vincent M.
Samanta Bappaditya
Son Hui S.
Yellen Benjamin B.
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