Document Detail

FTIR spectroscopy of NH3 on acidic and ionotropic alginate aerogels.
MedLine Citation:
PMID:  16529426     Owner:  NLM     Status:  MEDLINE    
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.
Romain Valentin; Raluca Horga; Barbara Bonelli; Edoardo Garrone; Francesco Di Renzo; Françoise Quignard
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Biomacromolecules     Volume:  7     ISSN:  1525-7797     ISO Abbreviation:  Biomacromolecules     Publication Date:  2006 Mar 
Date Detail:
Created Date:  2006-03-13     Completed Date:  2006-07-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100892849     Medline TA:  Biomacromolecules     Country:  United States    
Other Details:
Languages:  eng     Pagination:  877-82     Citation Subset:  IM    
Laboratoire de Matériaux Catalytiques et Catalyse en Chimie Organique, UMR 5618 CNRS-ENSCM-UM1, Institut C. Gerhardt, FR 1878, 8 rue de l'Ecole Normale, 34296 Montpellier Cedex 5, France.
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MeSH Terms
Alcohols / chemistry
Alginates / chemistry*
Ammonia / chemistry*
Biocompatible Materials / chemistry*
Carboxylic Acids / chemistry
Hydrogel / chemistry
Hydrogen-Ion Concentration
Macromolecular Substances
Nitrogen / chemistry
Spectroscopy, Fourier Transform Infrared / methods*
Spectrum Analysis
Reg. No./Substance:
0/Alcohols; 0/Alginates; 0/Biocompatible Materials; 0/Carboxylic Acids; 0/Cations; 0/Macromolecular Substances; 25852-47-5/Hydrogel; 7664-41-7/Ammonia; 7727-37-9/Nitrogen

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