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Article Dans Une Revue Nuovo cimento della societa italiana di fisica b-general physics relativity Année : 2008

Preparation of dispersed transition metal oxides from polysaccharide precursors

Résumé

The calcination of citrate-chelated cations is a time-honoured method to prepare dispersed oxides. The calcination of polysaccharide gels is also an effective method to prepare dispersed oxides. The ionotropic gelling of alginate, a natural block polysaccharide with carboxylic functions, implies the complexation of transition metal cations in an organic matrix whose texture can be easily controlled. Alginate hydrogel microspheres with 98 % porosity and more than 10 % cation content (w/w) can be formed. Supercritical drying preserves the dispersion of the gels and the resulting aerogels have specific surface as high as 500 m2 g-1. In this communication, the thermal degradation of alginate aerogels has been used to form oxide nanocrystals organized in open aggregates.

Domaines

Matériaux
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Dates et versions

hal-00368118 , version 1 (13-03-2009)

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Citer

Abdellatif Barakat, Bich Chiche, Françoise Quignard, Francesco Di Renzo. Preparation of dispersed transition metal oxides from polysaccharide precursors. Nuovo cimento della societa italiana di fisica b-general physics relativity, 2008, 123 (10), pp.1391-1397. ⟨10.1323/ncb/i-2008-10715-3⟩. ⟨hal-00368118⟩
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