Issue 42, 2010
From the journal:

Physical Chemistry Chemical Physics

NMR studies into colloidal stability and magnetic order in fatty acid stabilised aqueous magnetic fluids†

Swapankumar Ghosh,ab   Darren Carty,a   Sarah P. Clarke,a   Serena A. Corr,c   Renata Tekoriute,c   Yurii K. Gun'koc  and  Dermot F. Brougham*a  

* Corresponding authors

a National Institute for Cellular Biotechnology, School of Chemical Sciences, Dublin City University, Dublin 9, Ireland
E-mail: dermot.brougham@dcu.ie
Fax: +353 1 7005503
Tel: +353 1 7005472

b Ceramics Division, National Institute for Interdisciplinary Science and Technology (NIIST), CSIR, Trivandrum, India

c School of Chemistry and CRANN Institute, Trinity College, University of Dublin, Dublin 2, Ireland

Abstract

We report the physico-chemical characterisation of fatty acid stabilised aqueous magnetic fluids, which are ideal systems for studying the influence of nanoparticle aggregation on the emergent magnetic resonance properties of the suspensions. Stable colloids of superparamagnetic magnetite, Fe3O4, nanoparticle clusters in the 80 to 100 nm size range were produced by in situ nanoparticle growth and stabilisation, and by suspending pre-formed nanoparticles. NMR relaxation analysis shows that the magnetic resonance properties of the two types of suspension differ substantially and provides new insights into how the relaxation mechanisms are determined by the organisation of the nanoparticles within the clusters.

Graphical abstract: NMR studies into colloidal stability and magnetic order in fatty acid stabilised aqueous magnetic fluids

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Article information

DOI
https://doi.org/10.1039/C0CP00989J
Article type
Paper
Submitted
25 Jun 2010
Accepted
07 Sep 2010
First published
05 Oct 2010

Phys. Chem. Chem. Phys., 2010,12, 14009-14016

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NMR studies into colloidal stability and magnetic order in fatty acid stabilised aqueous magnetic fluids

S. Ghosh, D. Carty, S. P. Clarke, S. A. Corr, R. Tekoriute, Y. K. Gun'ko and D. F. Brougham, Phys. Chem. Chem. Phys., 2010, 12, 14009 DOI: 10.1039/C0CP00989J

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