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ABSTRACT 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

crystals1 and DNA biosensors2) and is of fundamental importance in improving our understanding of self-assembly processes occurring on molecular to macroscopic length scales3,4,5. 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. Access through your institution Buy or subscribe This is a preview of subscription content,

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NANOPARTICLES Article Open access 28 September 2021 TUNABLE ASSEMBLY OF HYBRID COLLOIDS INDUCED BY REGIOSELECTIVE DEPLETION Article 27 July 2020 TOTAL SYNTHESIS OF COLLOIDAL MATTER Article

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authors would like to thank the US National Science Foundation (grants NSEC DMI-0531171 and MRSEC DMR-0213695 to V.M.R. and grants CMMI-0608819 and CMMI-0625480 to B.B.Y.) for supporting

this work. AUTHOR INFORMATION Author notes * Randall M. Erb and Hui S. Son: These authors contributed equally to this work. AUTHORS AND AFFILIATIONS * Department of Mechanical Engineering

and Materials Science, Duke University, Center for Biologically Inspired Materials and Material Systems, Box 90300, Hudson Hall, Durham, North Carolina 27708, USA, Randall M. Erb, Hui S. Son

 & Benjamin B. Yellen * Department of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, USA, Bappaditya Samanta & Vincent M. Rotello Authors * Randall M. Erb View

author publications You can also search for this author inPubMed Google Scholar * Hui S. Son View author publications You can also search for this author inPubMed Google Scholar *

Bappaditya Samanta View author publications You can also search for this author inPubMed Google Scholar * Vincent M. Rotello View author publications You can also search for this author

inPubMed Google Scholar * Benjamin B. Yellen View author publications You can also search for this author inPubMed Google Scholar CORRESPONDING AUTHOR Correspondence to Benjamin B. Yellen.

SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION This file contain Supplementary Materials and Methods, Supplementary Figures 1-3 with Legends and Supplementary Video Legends 1-5. (PDF

503 kb) SUPPLEMENTARY MOVIE 1 This file shows the synchronous rotation of Saturn particles in a rotating external field (see files s1 for full legend). (MOV 866 kb) SUPPLEMENTARY MOVIE 2

This file shows the formation and dissolution of Saturn particles (see file s1 for full legend). (MOV 4013 kb) SUPPLEMENTARY MOVIE 3 This file shows a tri-component aqueous suspension of

colloidal particles (see file s1 for full legend). (MOV 453 kb) SUPPLEMENTARY MOVIE 4 This file shows the formation of mixed pole/ring structures (see file s1 for full legend). (MOV 1988 kb)

SUPPLEMENTARY MOVIE 5 This file shows flower shaped colloidal particles (see file s1 for full legend). (MOV 2813 kb) POWERPOINT SLIDES POWERPOINT SLIDE FOR FIG. 1 POWERPOINT SLIDE FOR FIG.

2 POWERPOINT SLIDE FOR FIG. 3 POWERPOINT SLIDE FOR FIG. 4 RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Erb, R., Son, H., Samanta, B. _et al._ Magnetic

assembly of colloidal superstructures with multipole symmetry. _Nature_ 457, 999–1002 (2009). https://doi.org/10.1038/nature07766 Download citation * Received: 21 February 2008 * Accepted:

07 January 2009 * Issue Date: 19 February 2009 * DOI: https://doi.org/10.1038/nature07766 SHARE THIS ARTICLE Anyone you share the following link with will be able to read this content: Get

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