Method of making silica nanoparticles

Details Method of making silica nanoparticles Method of making silica nanoparticles

1997-06-05

1998-06-23

Gorgos, Kathryn L.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

423335, C01B 33113

Patent

active

057700222

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.

REFERENCES:
patent: 5009703 (1991-04-01), Arvidson
patent: 5028267 (1991-07-01), Lane et al.
patent: 5173920 (1992-12-01), Bochsler
patent: 5580655 (1996-12-01), El-Shall

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