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Nanometric oxides from molecular precursors in the presence of starch: Coatings of glass with these oxides in silica sols

Published online by Cambridge University Press:  01 July 2006

Emanuela Callone ,
Giovanni Carturan ,
Marco Ischia  and
Adriana Sicurelli
Emanuela Callone
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38050 Trento, Italy
Giovanni Carturan*
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38050 Trento, Italy
Marco Ischia
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38050 Trento, Italy
Adriana Sicurelli
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, 38050 Trento, Italy
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Sn, Sn-Sb, Ti, Ce, Zr, Zn, In, In–Sn, and Fe oxides of nanometric size were obtained through the hydrolytic route, starting from molecular precursors in the presence of starch. Gels were treated with α-amylase to produce oxide suspensions and starch degradation. Solid oxide products resulted from reaction with H2O2, washing with H2O, and centrifugation of the suspensions. The nanometric size and morphology of crystallites were assessed by x-ray diffractometry, transmission electron microscopy, and, for SnO2, solid-state nuclear magnetic resonance. Product consolidation at 600 °C did not produce any noticeable increase in dimensions. Thermal analysis coupled with mass spectrometry of evolved gaseous species showed that glucoside residues remain chemically bonded to the nanoparticles, thus explaining the effective stabilization of crystallite dimensions. Aqueous suspensions of nanopowders were mixed with a silicon tetra-ethoxide ethanol solution and subjected to an ordinary sol-gel process. The resulting suspensions were used to obtain stable and homogeneous coatings on glass sheets.

Keywords

NanoscaleOxideOrganic
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1726 - 1737
Copyright
Copyright © Materials Research Society 2006

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