Cobalt ferrite nanocrystals: Out-performing magnetotactic bacteria

TitleCobalt ferrite nanocrystals: Out-performing magnetotactic bacteria
Publication TypeJournal Article
Year of Publication2007
AuthorsProzorov T, Palo P, Wang L, Nilsen-Hamilton M, Jones D, Orr D, Mallapragada SK, Narasimhan B, Canfield PC, Prozorov R
Journal TitleAcs Nano
Volume1
Pages228-233
Date PublishedOct
Type of ArticleArticle
ISBN Number1936-0851
Accession NumberISI:000252145100013
KeywordsAQUEOUS-SOLUTION, bioinspired synthesis, biomineralization protein, BLOCK-COPOLYMER, cobalt ferrite nanocrystals, F127, FERROFLUIDS, magnetic nanocrystals, MAGNETIC NANOPARTICLES, ORGANIZATION, PLURONIC, relaxation, superparamagnetism, templating, ULTRASO
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 (oFe(2)O(4) 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.

DOI10.1021/nn700194h
Alternate JournalACS Nano