Journal
MACROMOLECULAR SYMPOSIA
Volume 222, Issue -, Pages 93-101Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/masy.200550410
Keywords
aerogel; alginate; biopolymer; nitrogen adsorption; supercritical drying; textural characterisation
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Nitrogen adsorption at 77 K has been applied to the study of the texture of alginate aerogel microspheres obtained by CO2 supercritical drying of alcogels. The limited volume shrinkage suggests that the aerogels preserve the texture of the hydrogels. Alginate aerogels presents a N-2 adsorption at small pressure higher than reference non-porous silica, to be attributed to the polarity of the surface or to a small microporous volume. The aggregated nanobead strings of the guluronic-rich gels accounts for a significant mesoporosity. The N-2 adsorption results correspond to electron microscopy observations for features smaller than 50 nm.
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