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Effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment

Venkatesha, N and Qurishi, Yasrib and Atreya, Hanudatta S and Srivastava, Chandan (2016) Effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment. In: RSC ADVANCES, 6 (69). pp. 64605-64610.

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Official URL: http://dx.doi.org/10.1039/c6ra11016a

Abstract

This work illustrates the effect of core-shell nanoparticle geometry on the enhancement of the proton relaxivity value in a nuclear magnetic resonance experiment. Chemically synthesized CoFe2O4-MnFe2O4 core-shell nanoparticles were chosen as a candidate material. A two step methodology was used to synthesize the core-shell nanoparticles. In the first step, CoFe2O4 seed nanoparticles were synthesized and in the second step a MnFe2O4 phase was grown over seed CoFe2O4 nanoparticles to form the core-shell geometry. Characterization of the as-synthesized nanoparticles by diffraction methods, electron microscopy and X-ray photoelectron spectroscopy confirmed the formation of uniform core-shell nanoparticles. Magnetic measurement revealed the superparamagnetic nature of the as-synthesized core-shell nanoparticles. The transverse proton relaxivity values obtained by the nuclear magnetic resonance experiment conducted at room temperature using a field of 9.4 T in the presence of single phase CoFe2O4, MnFe2O4 and CoFe2O4-MnFe2O4 core-shell nanoparticles were 60.9 mM(-1) s(-1), 83.2 mM(-1) s(-1) and 194.8 mM(-1) s(-1) respectively. This result clearly illustrated that a greater magnetic inhomogeneity induced in the medium surrounding the core-shell nanoparticles containing two different magnetic phases yields the highest value for the transverse proton relaxivity.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 19 Aug 2016 09:56
Last Modified: 19 Aug 2016 09:56
URI: http://eprints.iisc.ac.in/id/eprint/54434

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