Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Patent
1975-06-02
1977-04-26
Meros, Edward J.
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
2523014F, 423328, C01B 3326, C09K 1108
Patent
active
040201473
ABSTRACT:
Extremely small, e.g., 2 micron diameter, cathodochromic sodalite particles are prepared through a hydrothermal method. The method includes the steps of uniformly heating a sealed reaction vessel which contains a water slurry of Al.sub.2 O.sub.3, SiO.sub.2, NaOH and NaX wherein X is at least one member of the group consisting of Cl-, Br-, and I-. The heating may be done at a temperature below about 356.degree. C. The heating is continued for an extended period of time to allow for dissolution of Al.sub.2 O.sub.3 and SiO.sub.2. The reaction vessel is then rapidly cooled so as to precipitate uniform size spherical particles of sodalite. The particles of sodalite are then sensitized. The sensitized sodalite particles are well suited for use in cathodochromic screens, i.e., screens employing these particles exhibit high sensitivity, high contrast, and high resolution.
REFERENCES:
patent: 3773540 (1973-11-01), Shidlovsky
Williams et al. "J. American Ceramic Society" vol. 52, No. 3, 1969, pp. 139-145.
Hackh's Chemical Dictionary, Fourth Edition, 1969, p. 183.
Zhdanov "Molecular Sieve Zeolites-I" Copyright 1971 ACS, pp. 20-36.
Bruestle Glenn H.
Meros Edward J.
RCA Corporation
Silverman Carl L.
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