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

Hossain, M.R., Wray, D., Paul, Alison and Griffiths, P.C. 2017. Probing the surfaces of core-shell and hollow nanoparticles by solvent relaxation NMR. Magnetic Resonance in Chemistry 56 (4) , pp. 251-256. 10.1002/mrc.4707

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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
Date Type: Published Online
Status: Published
Schools: Chemistry
Publisher: Wiley-Blackwell
ISSN: 0749-1581
Date of First Compliant Deposit: 23 February 2018
Date of Acceptance: 14 December 2017
Last Modified: 01 Jul 2019 10:06

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