Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure

Loche, D., Casula, M.F., Falqui, A., Marras, S., Corrias, A. (2010) Preparation of Mn, Ni, Co ferrite highly porous silica nanocomposite aerogels by an urea-assisted sol-gel procedure. Journal of Nanoscience and Nanotechnology, 10 (2). pp. 1008-1016. ISSN 1533-4880. (doi:10.1166/jnn.2010.1907) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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Official URL
http://dx.doi.org/10.1166/jnn.2010.1907

Abstract

The preparation of highly porous MnFe 2O 4-SiO 2 and NiFe 2O 4-SiO 2 nanocomposite aerogels with high purity and homogeneity was successfully achieved by a sol-gel procedure involving urea- assisted co-gelation of the precursor phases firstly applied for the synthesis of CoFe 2O 4-SiO 2. This method allows fast gelation, giving rise to aerogels with 97% porosity. The structural, morphological and textural characterization as a function of thermal treatments was carried out by a multitechnique approach confirming that, as in the case of CoFe 2O 4-SiO 2, the formation of single nanocrystals of manganese ferrite and nickel ferrite with spinel structure occurs after heating at 750 °C and is complete at 900 °C when the high porosity typical of aerogels is still retained. Thermogravimetric analysis (TG), differential thermal analysis (DTA), N 2-physisorption at 77 K, powder X-ray diffraction (XRD), and transmission electron microscopy (TEM) indicate that the compositional homogeneity, crystallite size, thermal stability, and porosity are controlled by the sol-gel parameters of the preparation.

Item Type: Article
DOI/Identification number: 10.1166/jnn.2010.1907
Uncontrolled keywords: Aerogel, Ferrite, Nanocomposite, Nanoparticles, Co ferrites, Compositional homogeneity, High porosity, High purity, Highly porous silica, Manganese ferrites, Multi-technique approach, Nickel ferrite, Powder X ray diffraction, Precursor phasis, Single nanocrystals, Sol-gel procedure, Spinel structure, TEM, Textural characterization, Thermal stability, Thermal treatment, Aerogels, Coagulation, Crystallite size, Differential thermal analysis, Ferrite, Ferrites, Gelation, Gels, Manganese, Manganese compounds, Metabolism, Nanocomposites, Nanoparticles, Physisorption, Porosity, Scanning electron microscopy, Silica, Sol-gel process, Sol-gels, Sols, Transmission electron microscopy, Urea, X ray diffraction, Thermogravimetric analysis
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 17 Dec 2014 11:50 UTC
Last Modified: 29 May 2019 13:57 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46213 (The current URI for this page, for reference purposes)
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