Characterization of metal hydroxy silicate dispersants.
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0123058, 1984 Jul; :1-122
Studies on the synthesis and characterization of aluminum hydroxy silicate polymers were undertaken using gel filtration chromatography, solid-state nuclear magnetic resonance spectroscopy, and other chemical analysis methods. The results of these investigations indicate that (1) hydrosols prepared at lower initial reactant concentrations at fixed si-al ratios produce higher levels of soluble si-al supernatant species, (2) hydrosols with a si-al ratio 6.66 to 1 contain the highest concentration of total and polymeric al and si in their corresponding supernatants, (3) the ratio of polymeric silicon to polymeric aluminum contents in supernatants from 6.66 to 1 hydrosols is between 7 and 9, and (4) aluminosilicate species of molecular weight range 500 to 2,000 exist in the hydrosol supernatants in addition to monomeric and polymeric silicates of a similar molecular weight range. Nuclear magnetic resonance studies of colloidal precipitates from these hydrosols are consistent with the soluble aluminosilicate and silicate species from supernatant studies. The nature and stoichiometry of the active species in a range of si-al hydrosols are discussed in conjunction with a chemical model of the reaction process used to prepare these systems.
Polymers; Hydrosols; Dispersants; Chemical-analysis; Alumium-silicates
CP; Final Contract Report
NTIS Accession No.
OFR 15-86; Contract-J0123058
Washington, DC: U.S. Department of the Interior, Bureau of Mines, Contract J0123058
South Dakota School of Mines and Technology