Magnetic nanoparticles: improving chemical stability via silica coating and organic grafting with silanes for acidic media catalytic reactions
(2015) Applied Catalysis A: General — Vol. 505, p. 200-212 (2015)
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- Magnetic nanoparticles based on Fe3O4(MNP) were coated with a silica (with thin or thick layers) priorto grafting with (3-aminopropyl) triethoxysilane (APTES) and octyltriethoxysilane (OTES) to increasetheir hydrophobicity and their pH stability. The synthetic conditions for the APTES grafting were chosento achieve either mono- or polylayers of chemically attached silane on the surface. The synthesizedFe3O4@SiO2- APTES and Fe3O4@SiO2-OTES core-shell particles were characterized by different methodsincluding XRD, TEM, FTIR-ATR, N2physisorption, ICP AES and XPS. The stability tests showed that coatingwith silica shell and grafting with organosilanes considerably improve the stability of MNP at pH 3; thethicker the silica layer the less iron oxide dissolved. The MNP-based materials showed catalytic activity inthe esterifications of propionic acid (PA) with n-butanol and of oleic acid (OA) with trimethylolpropane.In the PA containing medium the particles partly leach into a liquid medium contrary to the OA containingmedium where they seemed to be resistant to leaching.
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Kuzminska, M., Carlier, N., Backov, R., & Gaigneaux, E. (2015). Magnetic nanoparticles: improving chemical stability via silica coating and organic grafting with silanes for acidic media catalytic reactions. Applied Catalysis A: General, 505, 200-212. https://doi.org/10.1016/j.apcata.2015.08.005 (Original work published 2015)