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Probing the surfaces of core-shell and hollow nanoparticles by solvent relaxation NMR

Probing the surfaces of core-shell and hollow nanoparticles by solvent relaxation NMR

Hossain, M.R., Wray, D. ORCID: 0000-0002-0799-2730, Paul, A. and Griffiths, P.C. ORCID: 0000-0002-6686-1271 (2017) Probing the surfaces of core-shell and hollow nanoparticles by solvent relaxation NMR. Magnetic Resonance in Chemistry, 56 (4). pp. 251-256. ISSN 0749-1581 (Print), 1097-458X (Online) (doi:10.1002/mrc.4707)

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Abstract

Measurement of the spin-spin NMR relaxation time (or its inverse, the rate) of water molecules in aqueous nanoparticle dispersions has become a popular approach to probe of the nature and structure of the particle surface and any adsorbed species. Here, we report on the characterisation of aqueous dispersions of hollow amorphous nanoparticles, that have two liquid accessible surfaces (inner cavity surface and outer shell surface), plus the solid (silica) and core-shell (titania-silica) nanoparticle precursors from which the hollow particles have been prepared. In all cases, the observed water relaxation rates scale linearly with particle surface area, with the effect being more pronounced with increasing levels of titania present at the particle surface. Two distinct behaviours were observed for the hollow nanoparticles at very low volume fractions, which appear to merge with increasing surface area (particle concentration). Herewith, we further show the versatility of solvent NMR spectroscopy as a probe of surface character.

Item Type: Article
Uncontrolled Keywords: solid, core-shell and hollow particles, solvent relaxation
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 27 Dec 2018 01:38
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
URI: http://gala.gre.ac.uk/id/eprint/18488

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