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Small‐Angle Neutron Scattering and Rheological Characterization of Aluminosilicate Hydrogels
Author(s) -
Phair John W.,
Schulz Jamie C.,
Aldridge Laurie P.,
Smith J. David
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00129.x
Subject(s) - aluminosilicate , rheometry , self healing hydrogels , small angle x ray scattering , rheology , materials science , fractal dimension , colloid , neutron scattering , small angle neutron scattering , chemical engineering , dynamic light scattering , colloidal silica , composite material , scattering , mineralogy , fractal , chemistry , polymer chemistry , nanoparticle , nanotechnology , optics , organic chemistry , catalysis , mathematics , mathematical analysis , engineering , physics , coating
Structure and formation of aluminosilicate hydrogels were investigated as a function of chemical composition. Oscillatory rheometry was used to measure the dynamic moduli, G ‘ and G “, of the gels during setting. The formation of aluminosilicate hydrogels was monitored over time as a function of the storage modulus for gels of low solids volumes, φ < 0.030. Overall gel strength correlated well to the fractal dimension, D , observed by neutron scattering. Scattering data were interpreted using the power law, and the Guinier relationship was used to determine the size of the constructing colloidal/gel particles. Aluminosilicate hydrogels were observed to consist of large fractal aggregates of indeterminable size constructed from smaller subunits of ∼45 Å in dimension. Structure and formation of the gels were highly dependent on [Al 2 O 3 ] and [Na 2 O] content.