Formation of Protein− Metal Oxide Nanostructures by the

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Langmuir 2007, 23, 10342-10347

Formation of Protein-Metal Oxide Nanostructures by the Sonochemical Method: Observation of Nanofibers and Nanoneedles Christopher E. Bunker,*,† Kyle C. Novak,‡ Elena A. Guliants,‡ Barbara A. Harruff,§ M. Jaouad Meziani,§ Yi Lin,§ and Ya-Ping Sun§ Air Force Research Laboratory, Propulsion Directorate, Wright-Patterson Air Force Base, Ohio 45433-7103, UniVersity of Dayton Research Institute, Nonmetallic Materials DiVision, Dayton, Ohio 45469, and Department of Chemistry, Howard L. Hunter Chemistry Laboratory, Clemson UniVersity, Clemson, South Carolina 29634-0973 ReceiVed May 11, 2007. In Final Form: July 6, 2007 The sonochemical reaction of iron pentacarbonyl is explored in water and in water with the protein BSA (bovine serum albumen). In water, the reaction is found to produce spherical nanoparticles of magnetite (Fe3O4) with a particle size distribution of