FTIR spectroscopy of NH3 on acidic and ionotropic alginate aerogels

Biomacromolecules
Romain ValentinFrançoise Quignard

Abstract

The acidity of alginate aerogel films has been investigated by infrared spectroscopy of adsorbed NH(3). Supercritical drying of the alginate provided samples with a surface area of several hundred square meters per gram, in which the probe molecule could reach all acidic sites. Free carboxylic groups were studied on acid-gelled alginates and were found to behave as effective Brønsted acid sites. Ionotropic alginate gels formed by alkaline earth cations presented only the Lewis acidity of the cations. Ionotropic gels formed by transition metal cations presented both Lewis and Brønsted sites, because of the presence of a fraction of free carboxylic groups. The incomplete salification was correlated to the pH of the gelling solutions.

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Citations

Aug 1, 2012·International Journal of Nanomedicine·Judith Díaz-VisurragaApolinaria García
Jan 19, 2016·Journal of Hazardous Materials·Yang ChenJiangfeng Yang
Jul 14, 2010·Journal of Colloid and Interface Science·Fumio KurayamaNoboru Suzuki
Jan 11, 2012·Nanomaterials·Claire JouanninEric Guibal
Jun 12, 2008·The Journal of Physical Chemistry. B·Xinhong ChangXiuling Jiao
May 23, 2008·Biomacromolecules·Fengyi LiuFrançoise Quignard
Jul 14, 2009·Biomacromolecules·Andrea BarbettaMariella Dentini
Oct 4, 2007·Biomacromolecules·Romain ValentinFrançoise Quignard

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