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Size stabilization of nanoparticles by polysaccharides: Effectiveness in the wet and curing steps

Published online by Cambridge University Press:  31 January 2011

Emanuela Callone ,
Giovanni Carturan ,
Marco Ischia  and
Adriana Sicurelli
Emanuela Callone*
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, 38050 Trento, Italy
Giovanni Carturan
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, 38050 Trento, Italy
Marco Ischia
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, 38050 Trento, Italy
Adriana Sicurelli
Affiliation:
Department of Materials Engineering and Industrial Technologies, University of Trento, via Mesiano 77, 38050 Trento, Italy
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Starch suspension proves to be a useful matrix for the hydrolytic route to metal oxide nanoparticles, due to its size-stabilization effect, which works also at high temperatures. To understand the type of interaction between the organic part and the oxide particles, various parameters, such as viscosity, temperature, degree of polymerization, and organic/inorganic kinds of dispersant, are tested through x-ray diffraction (XRD), transmission electron microscopy (TEM), solid-state nuclear magnetic resonance (NMR), and thermogravimetric mass spectra (TG–MS) analyses of the obtained SnO2 nanopowders. Results highlight the unique role of starch compared with other hydrophilic dispersants that do not ensure effective size stabilization on curing up to 600 °C. The proof comes from the study of pyrolysis of the residual organic groups surrounding the particles. They are chelating carboxylic species that prevent the coalescence among metal oxide nanoparticles.

Keywords

Nucleation & growthDispersantSol-gel
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 12 , December 2007 , pp. 3344 - 3354
Copyright
Copyright © Materials Research Society 2007

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