Effects of solvent structure on the distribution of silicate anions in mixed aqueous/organic solutions of alkaline tetramethylammonium silicate

Journal Article · Thu Nov 14 00:00:00 EST 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100176a088· OSTI ID:7274141

Hendricks, W M; Bell, A T; Radke, C J ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

Interest in the physical-chemical processes occurring during zeolite synthesis has stimulated the study of dissolved silicate oligomers in aqueous alkaline solution and their possible link to zeolite nucleation and crystal growth. Effects of solvent structure on the equilibrium distribution of silicate oligomers in mixed organic/aqueous solutions of tetramethylammonium hydroxide (TMAOH) have been investigated by using {sup 29}Si NMR spectroscopy. The results indicate that the presence of organic molecules leads to condensation of the silicates, particularly to double-ring structures. Equilibrium calculations indicate that the observed extent of silicate condensation exceeds what would be expected from mass action. The variety of organic solvents used allowed elucidation of structure effects due to the following: carbon chain length, carbon chain morphology, functional group, and placement of the functional group. The structural effects of organic solvents can be attributed to the ordering of water around the solvent molecules.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7274141
• Journal Information: Journal of Physical Chemistry; (United States), Vol. 95:23; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ORGANIC SOLVENTS
SOLVENT PROPERTIES
SILICATES
DISTRIBUTION
ANIONS
AQUEOUS SOLUTIONS
EQUILIBRIUM
EXPERIMENTAL DATA
NUCLEAR MAGNETIC RESONANCE
SILICON 29
CHARGED PARTICLES
DATA
DISPERSIONS
EVEN-ODD NUCLEI
INFORMATION
IONS
ISOTOPES
LIGHT NUCLEI
MAGNETIC RESONANCE
MIXTURES
NUCLEI
NUMERICAL DATA
OXYGEN COMPOUNDS
RESONANCE
SILICON COMPOUNDS
SILICON ISOTOPES
SOLUTIONS
SOLVENTS
STABLE ISOTOPES
400201* - Chemical & Physicochemical Properties