Matrix Assisted Formation of Ferrihydrite Nanoparticles in a Siloxane/Poly(Oxyethylene) Nanohybrid

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dc.creatorSilva, Nuno J. O.
dc.creatorAmaral, Vitor S.
dc.creatorBermudez, Veronica de Zea
dc.creatorNunes, Silvia C.
dc.creatorOstrovskii, Denis
dc.creatorRocha, Joao
dc.creatorCarlos, Luis D.
dc.date2004-10-27
dc.date.accessioned2026-07-07T03:01:43Z
dc.date.available2026-07-07T03:01:43Z
dc.descriptionMatrix-assisted formation of ferrihydrite, an iron oxide hydroxide analogue of the protein ferritin-core, in a sol-gel derived organic-inorganic hybrid is reported. The hybrid network (named di-ureasil) is composed of poly(oxyethylene) chains of different average polymer molecular weights grafted to siloxane domains by means of urea cross-linkages and accommodates ferrihydrite nanoparticles. Magnetic measurements, Fourier transform infrared and nuclear magnetic resonance spectroscopy reveal that the controlled modification of the polymer molecular weight allows the fine-tuning of the ability of the hybrid matrix to assist and promote iron coordination at the organic-inorganic interface and subsequent nucleation and growth of the ferrihydrite nanoparticles whose core size (2-4 nm) is tuned by the amount of iron incorporated. The polymer chain length, its arrangement and crystallinity, are key factors on the anchoring and formation of the ferrihydrite particles.
dc.description7 pages, 6 figures. To be published in J. Mater. Chem
dc.identifierhttps://arxiv.org/abs/cond-mat/0410695
dc.identifierhttp://arxiv.org/abs/cond-mat/0410695
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25152
dc.subjectMaterials Science
dc.titleMatrix Assisted Formation of Ferrihydrite Nanoparticles in a Siloxane/Poly(Oxyethylene) Nanohybrid
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