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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 500m 2 g −1 . In this communication, it is shown that the thermal degradation of alginate...
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