Matrix assisted formation of ferrihydrite nanoparticles in a siloxane/poly(oxyethylene) nanohybrid
Artikel i vetenskaplig tidskrift, 2005

Matrix-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 diureasil) 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 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 in the anchoring and formation of the ferrihydrite particles.

Författare

N. J. O. Silva

Centro de Investigacao em Materiais Ceramicos e Compositos

V. S. Amaral

Centro de Investigacao em Materiais Ceramicos e Compositos

V. D. Bermudez

Universidade de Tras-os-Montes e Alto Douro

S. C. Nunes

Universidade de Tras-os-Montes e Alto Douro

Denis Ostrovskii

Chalmers, Teknisk fysik

J. Rocha

Centro de Investigacao em Materiais Ceramicos e Compositos

L. D. Carlos

Centro de Investigacao em Materiais Ceramicos e Compositos

Journal of Materials Chemistry

0959-9428 (ISSN) 1364-5501 (eISSN)

Vol. 15 4 484-490

Ämneskategorier

Annan teknik

DOI

10.1039/b410653a