The influence of catechols on the magnetization of iron oxide nanoparticles

0573325 - FZÚ 2024 RIV CH eng J - Journal Article
Čampelj, S. - Pobrežnik, M. - Landovský, Tomáš - Kovač, J. - Martin-Samos, L. - Hamplová, Věra - Lisjak, D.
The influence of catechols on the magnetization of iron oxide nanoparticles.
Nanomaterials. Roč. 13, č. 12 (2023), č. článku 1822. E-ISSN 2079-4991
EU Projects: European Commission(XE) 899285 - MAGNELIQ
Institutional support: RVO:68378271
Keywords : magnetic nanoparticles * catechols * adsorption * magnetic properties * XPS * DFT
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 5.3, year: 2022
Method of publishing: Open access

In this study, MNPs were functionalized with pyrocatechol (CAT), pyrogallol (GAL), caffeic acid (CAF), and nitrodopamine (NDA) at pH 8 and pH 11. The functionalization of the MNPs was successful, except in the case of NDA at pH 11. The thermogravimetric analyses indicated that the surface concentration of the catechols was between 1.5 and 3.6 molecules/nm2. The saturation magnetizations (Ms) of the functionalized MNPs were higher than the starting material. XPS analyses showed only the presence of Fe(III) ions on the surface, thus refuting the idea of the Fe being reduced and magnetite being formed on the surfaces of the MNPs. Density functional theory (DFT) calculations were performed for two modes of adsorption of CAT onto two model surfaces: plain and adsorption via condensation. The total magnetization of both adsorption modes remained the same, indicating that the adsorption of the catechols does not affect the Ms.

Permanent Link: https://hdl.handle.net/11104/0343789