Silica nanoparticles obtained from a method involving a direct c

Details Silica nanoparticles obtained from a method involving a direct c Silica nanoparticles obtained from a method involving a direct c

1998-01-08

1999-10-05

Le, Hoa T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

204164, 423325, 423335, 428404, 428704, B32B 516, C01B 1514, C01B 3312

Patent

active

059621320

ABSTRACT:
A method of making silicon oxide nanoparticles possessing photoluminescence in the blue and green part of the visible spectrum when irradiated with ultraviolet (UV) light. The silicon oxide nanoparticles are formed in a chamber containing a direct current (dc) electric arc that generates a plasma in an oxygen-containing atmosphere. In the chamber, silicon is used as the anode, and the cathode can be copper (Cu) or tungsten (W). The use of silicon as an electrode is enabled by doping silicon with boron to a sufficiently high electronic conductivity, and orienting the two electrodes vertically in the chamber, so that the silicon anode is lowermost to contain silicon in the anode when it melts and vaporizes in the arc. The silicon oxide nanoparticles are collected on a cold plate adjacent to the arc.

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patent: 5792679 (1998-08-01), Nakato

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