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Polysaccharide hydrogels are open networks of naturally functionalized hydrocarbon materials. In this study, gels of several polysaccharides (alginate, alginic acid, κ-carrageenan, agar, chitin and chitosan) have been prepared by various gelling methods. Supercritical drying allows to form aerogels with surface areas as high as 600m 2 g −1 and active sites with acid (alginate or carrageenan)...
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