FTIR spectroscopy of NH3 on acidic and ionotropic alginate aerogels

被引：57
作者：
Valentin, R
Horga, R
Bonelli, B
Garrone, E
Di Renzo, F
Quignard, F
机构：
[1] Inst C Gerhardt, Lab Mat Catalyt & Catalyse Chim Organ, UMR 5618, CNRS,ENSCM,UM1, F-34296 Montpellier 5, France
[2] Politecn Torino, Dipartimento Sci Mat & Ingn Chim, I-10129 Turin, Italy
来源：
BIOMACROMOLECULES | 2006年 / 7卷 / 03期
关键词：
D O I：
10.1021/bm050559x
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The acidity of alginate aerogel films has been investigated by infrared spectroscopy of adsorbed NH3. Supercritical drying of the alginate provided samples with a surface area of several hundred square meters per gram, in which 19 the probe molecule could reach all acidic sites. Free carboxylic groups were studied on acid-gelled alginates and were found to behave as effective Bronsted acid sites. lonotropic alginate gels formed by alkaline earth cations presented only the Lewis acidity of the cations. lonotropic gels formed by transition metal cations presented both Lewis and Bronsted sites, because of the presence of a fraction of free carboxylic groups. The incomplete salification 14 was correlated to the pH of the gelling solutions.
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页码：877 / 882
页数：6
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