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The mechanism underlying the functionalisation of cobalt nanoparticles by carboxylic acids: a first-principles computational study

Farkaš, Barbara, Terranova, Umberto and de Leeuw, Nora H. 2021. The mechanism underlying the functionalisation of cobalt nanoparticles by carboxylic acids: a first-principles computational study. Journal of Materials Chemistry B: Materials for biology and medicine 9 (24) , pp. 4915-4928. 10.1039/D0TB02928A

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Abstract

The promise of biocompatible magnetic nanoparticles with high magnetic saturation in the implementation as drug carriers and hyperthermia agents has generated significant interest in functionalised cobalt nanoparticles. Carboxylic acid coatings on metallic nanoparticles have been shown as an attractive option owing to their respectable stability and biocompatibility. However, only limited information is available on the molecular mechanism leading to the formation of such protective coatings. In this study, ab initio molecular dynamics simulations have been used to unravel the functionalisation mechanism starting from a neutral cobalt cluster and valeric acid molecules. Three stages were detected in the coating process: (i) rapid initial adsorption of acid molecules, (ii) simultaneous adsorption of new molecules and dissociation of those already interacting with the cluster, and, finally, (iii) grouping of dissociated hydrogen atoms and subsequent desorption of acid molecules. The fate of the hydrogen atoms was probed through a combination of static and dynamic ab initio modelling approaches, which predicted H2 generation with favourable energetics. A better understanding of the functionalisation and interaction mechanisms will aid the rational design of biocompatible cobalt nanoparticles for various applications.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Publisher: Royal Society of Chemistry
ISSN: 2050-750X
Funders: EPSRC
Date of First Compliant Deposit: 16 June 2021
Date of Acceptance: 2 June 2021
Last Modified: 11 Aug 2021 14:02
URI: https://orca.cardiff.ac.uk/id/eprint/141932

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