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6 Aug 2012

Volume 101, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 101, 062401 (2012); http://dx.doi.org/10.1063/1.4730997 (4 pages)

Mahdi Jamali, Kulothungasagaran Narayanapillai, Jae Hyun Kwon, and Hyunsoo Yang
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Biological colloid engineering: Self-assembly of dipolar ferromagnetic chains in a functionalized biogenic ferrofluid

Warren C. Ruder, Chia-Pei D. Hsu, Brent D. Edelman, Jr., Russell Schwartz, and Philip R. LeDuc

Appl. Phys. Lett. 101, 063701 (2012); http://dx.doi.org/10.1063/1.4742329 (5 pages) | Cited 1 time

Online Publication Date: 7 August 2012

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We have studied the dynamic behavior of nanoparticles in ferrofluids consisting of single-domain, biogenic magnetite (Fe3O4) 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.
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81.16.Dn Self-assembly
82.70.Dd Colloids
75.50.Dd Nonmetallic ferromagnetic materials
75.50.Mm Magnetic liquids
75.50.Tt Fine-particle systems; nanocrystalline materials
81.07.Bc Nanocrystalline materials
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