Do TiO2 Nanoparticles Really Taste Better When Cooked in a Microwave Oven?

Microwave‐assisted synthesis represents a valuable improvement in the domains of molecular and organic chemistry and was recently extended to inorganic and materials chemistry. A comparison of titanium dioxide nanoparticles synthesised in aqueous solution prepared in a microwave or a conventional ov...

Full description

Saved in:
Bibliographic Details
Published in:European journal of inorganic chemistry 2012-06, Vol.2012 (16), p.2707-2715
Main Authors: Dufour, Fabien, Cassaignon, Sophie, Durupthy, Olivier, Colbeau-Justin, Christophe, Chanéac, Corinne
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
Microwave
Nanoparticles
Photocatalysis
Sol-gel processes
Synthetic methods
Titanium
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Microwave‐assisted synthesis represents a valuable improvement in the domains of molecular and organic chemistry and was recently extended to inorganic and materials chemistry. A comparison of titanium dioxide nanoparticles synthesised in aqueous solution prepared in a microwave or a conventional oven is presented here. More precisely, three different protocols were used in order to determine the impact of the heating mode on the final product in terms of crystalline structure, particle size and morphology. Therefore, the resultant powders were analysed by Raman spectroscopy as well as X‐ray and electron diffraction and transmission electron microscopy. The results show that microwave treatment significantly reduces the heating time and generally produces smaller nanoparticles. The rutile/anatase/brookite phase distribution is also modified by the heating mode in certain protocols up to the formation of a pure anatase phase, for instance. The impact of microwaves on the solvent and on the inorganic precursors has been demonstrated. A photocatalytic test and time‐resolved microwave conductivity experiments were performed on rather similar samples prepared with the two heating modes in order to probe the improvement of the crystalline quality and its consequences on the photocatalytic activity of the TiO2 material. In the present study of TiO2 nanomaterials elaborated in aqueous conditions, it is demonstrated that microwave‐assisted synthesis may significantly change the structure and size of nanoparticles in comparison with conventional heating although it does not systematically improve the targeted property.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201101269