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Methods to Analyse the Texture of Alginate Aerogel Microspheres
Author(s) -
Valentin Romain,
Molvinger Karine,
Quignard Françoise,
Di Renzo Francesco
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200550410
Subject(s) - aerogel , microporous material , adsorption , texture (cosmology) , self healing hydrogels , shrinkage , supercritical drying , microsphere , materials science , chemical engineering , porosity , glass microsphere , supercritical fluid , volume (thermodynamics) , composite material , chemistry , polymer chemistry , organic chemistry , computer science , physics , quantum mechanics , artificial intelligence , image (mathematics) , engineering
Nitrogen adsorption at 77 K has been applied to the study of the texture of alginate aerogel microspheres obtained by CO 2 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.