Magnetic assembly of colloidal superstructures with multipole symmetry.

Published

Journal Article

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.

Full Text

Duke Authors

Cited Authors

  • Erb, RM; Son, HS; Samanta, B; Rotello, VM; Yellen, BB

Published Date

  • February 2009

Published In

Volume / Issue

  • 457 / 7232

Start / End Page

  • 999 - 1002

PubMed ID

  • 19225522

Pubmed Central ID

  • 19225522

Electronic International Standard Serial Number (EISSN)

  • 1476-4687

International Standard Serial Number (ISSN)

  • 0028-0836

Digital Object Identifier (DOI)

  • 10.1038/nature07766

Language

  • eng