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.

PDF RSC_Adv_6-69_64605_2016.pdf - Published Version Restricted to Registered users only Download (798kB) | Request a copy

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
Publication:	RSC ADVANCES
Publisher:	ROYAL SOC CHEMISTRY
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)
Date Deposited:	19 Aug 2016 09:56
Last Modified:	19 Aug 2016 09:56
URI:	http://eprints.iisc.ac.in/id/eprint/54434

Actions (login required)

View Item