Issue 10, 2002
From the journal:

Journal of Materials Chemistry

How to tailor maghemite particle size in γ-Fe2O3–SiO2 nanocomposites

C. Cannas,a   G. Concas,c   D. Gatteschi,b   A. Musinu,a   G. Piccalugaa  and  C. Sangregoriob  

a Dipartimento di Scienze Chimiche, Cittadella Universitaria di Monserrato, CA, Italy

b Dipartimento di Chimica, Università di Firenze, INSTM, SestoFiorentino, FI, Italy

c Dipartimento di Fisica, Università di Cagliari e INFM, Cittadella Universitaria di Monserrato, CA, Italy

Abstract

A sol–gel procedure for the tailoring of maghemite particle size in silica-based nanocomposites is proposed. The preparation method allows control of the gelation time, which is varied from 2 to 16 days in samples having the same concentration of iron oxide (25%). Superparamagnetic particles of γ-Fe2O3 with sizes in the 2.5–5.6 nm range were found in all the samples, as confirmed by TEM, Mössbauer spectroscopy and magnetic measurements. The particle size was independent of the porosity of the silica host matrix, but strongly dependent on the amount of solvent trapped inside the gels. The solvent plays an important role, favouring the formation of Fe3O4 nanoparticles as an intermediate step before the final oxidation to maghemite.

Graphical abstract: How to tailor maghemite particle size in γ-Fe2O3–SiO2 nanocomposites

About
Cited by
Related
Download options Please wait...

Article information

DOI
https://doi.org/10.1039/B204292D
Article type
Paper
Submitted
03 May 2002
Accepted
05 Jul 2002
First published
13 Aug 2002

J. Mater. Chem., 2002,12, 3141-3146

Permissions

Request permissions

How to tailor maghemite particle size in γ-Fe2O3–SiO2 nanocomposites

C. Cannas, G. Concas, D. Gatteschi, A. Musinu, G. Piccaluga and C. Sangregorio, J. Mater. Chem., 2002, 12, 3141 DOI: 10.1039/B204292D

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements