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Cobalt Ferrite Nanocrystals: Out-Performing Magnetotactic Bacteria

Tanya Prozorov†, Pierre Palo†‡, Lijun Wang†‡, Marit Nilsen-Hamilton†‡*, DeAnna Jones†, Daniel Orr†§, Surya K. Mallapragada†§*, Balaji Narasimhan†§*, Paul C. Canfield†

and Ruslan Prozorov†

^† Ames Laboratory, U.S. Department of Energy, Ames, Iowa 50011

^‡ Department of Biochemistry, Biophysics and Molecular Biology

^§ Department of Chemical and Biological Engineering

Department of Physics & Astronomy, Iowa State University, Ames, Iowa 50011

ACS Nano, 2007, 1 (3), pp 228–233

DOI: 10.1021/nn700194h

Publication Date (Web): October 31, 2007

* Address correspondence to prozorov@ameslab.gov, marit@iastate.edu, nbalaji@iastate.edu, suryakm@iastate.edu.

Abstract

Magnetotactic bacteria produce exquisitely ordered chains of uniform magnetite (Fe₃O₄) nanocrystals, and the use of the bacterial mms6 protein allows for the shape-selective synthesis of Fe₃O₄ nanocrystals. Cobalt ferrite (CoFe₂O₄) nanoparticles, on the other hand, are not known to occur in living organisms. Here we report on the use of the recombinant mms6 protein in a templated synthesis of CoFe₂O₄ nanocrystals in vitro. We have covalently attached the full-length mms6 protein and a synthetic C-terminal domain of mms6 protein to self-assembling polymers in order to template hierarchical CoFe₂O₄ nanostructures. This new synthesis pathway enables facile room-temperature shape-specific synthesis of complex magnetic crystalline nanomaterials with particle sizes in the range of 40–100 nm that are difficult to produce using conventional techniques.

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Published In Issue October 31, 2007
Article ASAPOctober 31, 2007
Received: August 25, 2007
Accepted: September 28, 2007

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Articles

Cobalt Ferrite Nanocrystals: Out-Performing Magnetotactic Bacteria