Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1986-11-24
1987-09-29
Doll, John
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
423339, C01B 3312
Patent
active
046968083
ABSTRACT:
A process for the preparation of transparent silica gels which can be used as crystal growth media is disclosed. A quantity of cation exchange resin beads is placed in a solution of a soluble potassium salt and stirred for several hours to allow the potassium ions to replace the cations on the resin beads. The supernatant liquid is then decanted through a filter, and the treated resin beads are rinsed with distilled water to remove excess salts. The treated resin beads are then transferred into a sodium silicate solution. The resulting mixture is stirred to allow the potassium ions on the treated resin beads to exchange with the sodium ions in the sodium silicate solution. The treated silicate solution is then poured through a coarse filter. A volume of boiled, cooled distilled water is added to a volume of the treated silicate solution, after which a volume of acetic acid solution is added to the mixture of distilled water and treated silicate solution. This mixture is then allowed to gel at room temperature, whereby a transparent silica gel is produced. The transparent silica gel is used as a crystal growth medium to simulate the convectionless environment of space and produce structurally perfect crystals.
REFERENCES:
patent: 2092163 (1937-09-01), Johnson
patent: 2593652 (1952-04-01), Blanchard
patent: 2933371 (1960-04-01), Alexander et al.
patent: 3077389 (1963-02-01), Schulze et al.
patent: 3397950 (1968-08-01), Schnorch et al.
patent: 3674709 (1972-07-01), Barrer et al.
patent: 4528172 (1985-07-01), Rieck et al.
Chemical Abstracts vol. 105, No. 24, 213052s, Wakabayashi et al., Ion Exchange Equilibria (between Glasses and Molten Salts) and Thermodynamic Properties in Mixed Alkali Glasses.
Chemical Abstracts, vol. 97, No. 16, 132173w, Monseev et al., Ion Exchange in Silicate Glasses.
Barber Patrick G.
Simpson Norman R.
Doll John
Freeman Lori S.
Helfrich George F.
Manning John R.
The United States of America as represented by the Administrator
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