Fine silica tube and process for making same

Details Fine silica tube and process for making same Fine silica tube and process for making same

1995-11-07

1996-11-12

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 54, 501 95, 501133, 501 35, 423338, 423339, C03C 1300, C03C 306

Patent

active

055739830

ABSTRACT:
A fine silica tube composed of silica gel and having an outer diameter of 0.05 to 2 .mu.m wherein the cylindrical wall portion of the tube has a cross-section defined by a substantially square outer periphery and a substantially square vacant center, or by a circular outer periphery and a substantially square vacant center; and a fine silica tube composed of silica glass and having an outer diameter of 0.05 to 1.4 .mu.m wherein the cylindrical wall portion of the tube has a cross-section defined by a substantially square outer periphery and a substantially square vacant center. The fine silica gel tube is made by treating a tetraalkoxysilane with ammonia or aqueous ammonia in a water-soluble alcohol medium in the presence of tartaric acid, citric acid, a tartaric acid salt or a citric acid salt, whereby the tetraalkoxysilane is hydrolyzed. The fine silica glass tube is made by calcining the fine silica gel tube at 800.degree. to 1,400.degree. C.

REFERENCES:
patent: 5011669 (1991-04-01), Tsuchiya et al.
patent: 5169809 (1992-12-01), Brenna et al.
Sumio Iijima, "Helical Microtuboles of Graphitic Carbon" Nature, Nov. 7, 1991, vol. 354, 56.
Ewan J. M. Hamilton et al, "Preparation of Amorphous Boron Nitride and its Conversion to a Turbostatic Tubular Form" Science, Apr. 30, 1993, vol. 260, 659.
Th. Nemetschek et al, Z. Naturforsch 8b, 410 (1953) no month.
Th. Nemetschek et al, Z. Naturforsch 9b, 166 (1954) no month.

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