Date of Original Version

8-6-2012

Type

Article

PubMed ID

22952408

Rights Management

© 2012 American Institute of Physics

Abstract or Description

We have studied the dynamic behavior of nanoparticles in ferrofluids consisting of single-domain, biogenic magnetite (Fe(3)O(4)) isolated from Magnetospirillum magnetotacticum (MS-1). Although dipolar chains form in magnetic colloids in zero applied field, when dried upon substrates, the solvent front disorders nanoparticle aggregation. Using avidin-biotin functionalization of the particles and substrate, we generated self-assembled, linear chain motifs that resist solvent front disruption in zero-field. The engineered self-assembly process we describe here provides an approach for the creation of ordered magnetic structures that could impact fields ranging from micro-electro-mechanical systems development to magnetic imaging of biological structures.

DOI

10.1063/1.4742329

Included in

Biology Commons

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Published In

Applied Physics Letters, 101, 6, 63701-63701.