Binary colloidal structures assembled through Ising interactions.


Journal Article

New methods for inducing microscopic particles to assemble into useful macroscopic structures could open pathways for fabricating complex materials that cannot be produced by lithographic methods. Here we demonstrate a colloidal assembly technique that uses two parameters to tune the assembly of over 20 different pre-programmed structures, including kagome, honeycomb and square lattices, as well as various chain and ring configurations. We programme the assembled structures by controlling the relative concentrations and interaction strengths between spherical magnetic and non-magnetic beads, which behave as paramagnetic or diamagnetic dipoles when immersed in a ferrofluid. A comparison of our experimental observations with potential energy calculations suggests that the lowest energy configuration within binary mixtures is determined entirely by the relative dipole strengths and their relative concentrations.

Full Text

Duke Authors

Cited Authors

  • Khalil, KS; Sagastegui, A; Li, Y; Tahir, MA; Socolar, JES; Wiley, BJ; Yellen, BB

Published Date

  • January 2012

Published In

Volume / Issue

  • 3 /

Start / End Page

  • 794 -

PubMed ID

  • 22531179

Pubmed Central ID

  • 22531179

Electronic International Standard Serial Number (EISSN)

  • 2041-1723

International Standard Serial Number (ISSN)

  • 2041-1723

Digital Object Identifier (DOI)

  • 10.1038/ncomms1798


  • eng