Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 42, Pages 14009-14016Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp00989j
Keywords
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Funding
- Enterprise Ireland [PC/2006/207, SC/2002/336, IF/2001/364, PC/2004/0429]
- Science Foundation Ireland [MASF666]
- Higher Education Authority of the Republic of Ireland
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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.
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