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Stable hydrosols for TiO2 coatings

Alphonse, Pierre and Varghese, Aneesha and Tendero, Claire Stable hydrosols for TiO2 coatings. (2010) Journal of Sol-Gel Science and Technology, vol. 56 (n° 3). pp. 250-263. ISSN 0928-0707

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Official URL: http://dx.doi.org/10.1007/s10971-010-2301-y

Abstract

The optimum processing parameters required to synthesize, by hydrolysis of titanium isopropoxide (TIP), highly stable hydrosols composed of nanoparticles of the smallest possible size, are deduced both from data available in literature and from our own experiments. The colloids prepared in these conditions are composed of aggregates of anatase (*90%) and brookite crystallites (5–6 nm). They are suitable for coatings and have longterm stability (more than one year) in terms of polymorphic composition, crystallite and agglomerate size. Stable sols composed solely of anatase crystallites (4 nm) can be prepared by partially complexing the TIP by acetylacetone before hydrolysis. It is not possible to produce porous films with these colloids because they are stabilized by electrostatic repulsion which causes the particles to organize themselves, during the drying step, to form materials with a close packed structure. However, coatings with controlled porosity can be prepared from these stable sols through the post addition of polymers, like PEG or block copolymers.

Item Type:Article
Additional Information:Thanks to Springer editor. The definitive version is available at http://www.springerlink.com/ The original PDF of the article can be found at Journal of Sol-Gel Science and Technology website : http://www.springerlink.com/content/t458u1g112465630/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
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Deposited By:Leila Abdelouhab

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