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Ionotropic alginate aerogels as precursors of dispersed oxide phases

Paper ID Volume ID Publish Year Pages File Format Full-Text
43655 45981 2007 5 PDF Available
Title
Ionotropic alginate aerogels as precursors of dispersed oxide phases
Abstract

Ionotropic gelling of alginate, a natural block polysaccharide with carboxylic functions, allows to form hydrogel microspheres with 98% porosity and more than 10% cation content (w/w). Supercritical drying preserves the dispersion of the gel and the resulting aerogels have specific surface as high as 500 m2 g−1. In this communication, it is shown that the thermal degradation of alginate aerogels allows to form aggregated nanocrystals of the mineral phase corresponding to the cation used in gelling. The aggregates of nanocrystals of carbonate and oxide retain the morphology of the parent gel particles and a significant fraction of their porosity.

Keywords
Nanoparticles; Transition metal oxides; Alginate; Polysaccharide; Aerogel; Copper oxide; Nickel oxide; Cobalt oxide; Calcium carbonate
First Page Preview
Ionotropic alginate aerogels as precursors of dispersed oxide phases
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 325, Issue 2, 15 June 2007, Pages 251–255
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis