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Electronic and Magnetic Characterization of in vivo Produced vs. in vitro Reconstituted Horse Spleen Ferritin

Published online by Cambridge University Press:  01 February 2011

Georgia C. Papaefthymiou ,
Arthur J. Viescas ,
Eamonn Devlin  and
Athanassios Simopoulos
Georgia C. Papaefthymiou
Affiliation:
[email protected], Villanova, Physics, Villanova, PA, 19085, United States
Arthur J. Viescas
Affiliation:
[email protected], Villanova, Physics, Villanova, PA, 19085, United States
Eamonn Devlin
Affiliation:
[email protected], NCSR Demokritos, Institute of Materials Science, Aghia Paraskevi, N/A, Greece
Athanassios Simopoulos
Affiliation:
[email protected], NCSR Demokritos, Institute of Materials Science, Aghia Paraskevi, N/A, Greece
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Abstract

Magnetic nanophases nucleated within horse spleen apoferritin nanotemplates under in vivo physiological conditions and in vitro reconstitution were characterized by Mössbauer spectroscopy in lyophilized form. Mössbauer spectra recorded at 80 K indicate that for the in vivo produced ferritin the presence of phosphates within the ferritin biomineral core results in larger quadrupole splittings, both at interior and surface sites, 0.62 mm/s and 1.06 mm/s, respectively, as compared to 0.56 mm/s and 0.75 mm/s for the reconstituted ferritin. Data collected at lower temperatures give blocking temperatures of 55 and 40 K for in vitro and in vivo samples. At 4.2 K, both samples give similar saturation hyperfine field values for the interior (495 kOe) and surface (450 kOe) iron sites. The temperature dependence of the reduced hyperfine magnetic fields at the interior iron sites is consistent with the collective magnetic excitations model, due to the particle's magnetization precession about the anisotropy axis. In contrast, a marked decrease in the reduced hyperfine field at surface sites with increasing temperature indicates a more complex spin excitation energy landscape at the surface.

Keywords

Mössbauer effectbiomaterialmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1056: Symposium HH – Nanophase and Nanocomposite Materials V , 2007 , 1056-HH03-27
Copyright
Copyright © Materials Research Society 2008

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