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Nitrogen sorption as a tool for the characterisation of polysaccharide aerogels

Robitzer, Mike and Tourrette, Audrey and Horga, Ron and Valentin, Romain and Boissière, M. and Devoisselle, Jean-Marie and Di Renzo, Francesco and Quignard, Françoise Nitrogen sorption as a tool for the characterisation of polysaccharide aerogels. (2011) Carbohydrate Polymers, vol. 85 (n° 1). pp. 44-53. ISSN 0144-8617

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Official URL: http://dx.doi.org/10.1016/j.carbpol.2011.01.040

Abstract

Supercritically dried aerogels of several polysaccharides (chitin, chitosan, alginate, alginic acid, k- carrageenan, and agar) have been characterised by physisorption ofN2. Surface areas as high as 570m2 g−1 have been measured. The nature of the functional groups of the polysaccharide significantly influences the adsorption of N2 on the surface of the aerogel. The net enthalpy of adsorption increases with the polarity of the surface groups of the polymer, in the order chitin < agar≤chitosan < carrageenan < alginic acid∼alginate. The surface area and the mesopore distribution of the aerogels depend both on the dispersion of the parent hydrogel and on the behaviour of each polymer in the drying treatment. Aerogels which retain the dispersion of the parent hydrogel are mainly macroporous (pores larger than 50 nm) while materials liable to shrink upon solvent exchange form mesoporous structures.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The orinal version is available at http://www.sciencedirect.com The original PDF of the article can be found at Carbohydrate Polymers website: http://www.sciencedirect.com/science/article/pii/S0144861711000737
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut National de la Recherche Agronomique - INRA
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université de Montpellier 1 (FRANCE)
Other partners > Université de Montpellier 2 (FRANCE)
Laboratory name:
Institut Charles Gerhardt - ICG (Montpellier, France) - Matériaux Avancés pour la Catalyse et la Santé
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Deposited By: Denis Faragou

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