Document Detail

Nanostructure of calcium alginate aerogels obtained from multistep solvent exchange route.
MedLine Citation:
PMID:  18844384     Owner:  NLM     Status:  MEDLINE    
Ca-alginate materials were studied by small-angle X-ray scattering (SAXS) at different steps of conversion from gel to aerogel in order to determine the relation between the polymer organization at the nanoscale in the gels and the final dry aerogel. In all cases, i.e. before and after the different exchanges of solvents and after the formation of the aerogel, the SAXS patterns exhibit an asymptotic behavior at low q values (in the experimental q range 7x10(-3) up to 2.10(-2) A(-1)) close to I(q) approximately q(-1), indicative of randomly oriented rod-like scattering objects. The evolution of the diameter of such rod-like objects was thus deduced from the maxima observed on Kratky plots, i.e. I(q) q2 vs q. The results are in perfect agreement qualitatively (rod-like anisometry type of the scattering objects) and quantitatively (diameter of the rods) with direct SEM observations of the morphology of aerogels and with the results of N2 adsorption on the aerogel. This is evidence that in the chosen experimental processing conditions, the morphology of the aerogel depends on the morphology of pre-existing objects within the gel, i.e. that the structure of the aerogel provides a correct image of the structure of the parent gel.
Mike Robitzer; Laurent David; Cyrille Rochas; Francesco Di Renzo; Françoise Quignard
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Publication Detail:
Type:  Journal Article     Date:  2008-10-10
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  24     ISSN:  0743-7463     ISO Abbreviation:  Langmuir     Publication Date:  2008 Nov 
Date Detail:
Created Date:  2008-10-30     Completed Date:  2008-12-01     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  United States    
Other Details:
Languages:  eng     Pagination:  12547-52     Citation Subset:  IM    
Institut Charles Gerhardt Montpellier, UMR 5253 CNRS-ENSCM-UM2-UM1, Matériaux Avancés pour la Catalyse et la Santé, ENSCM, 8 rue Ecole Normale, 34296 Montpellier Cedex 5, France.
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MeSH Terms
Alginates / chemistry*
Glucuronic Acid / chemistry
Hexuronic Acids / chemistry
Microscopy, Electron, Scanning
Solvents / chemistry*
Reg. No./Substance:
0/Alginates; 0/Gels; 0/Hexuronic Acids; 0/Solvents; 576-37-4/Glucuronic Acid; 9005-32-7/alginic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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