The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1998
Filed:
Jun. 05, 1997
Robert Pang Chang, Glenview, IL (US);
Jeffrey Michael Lauerhaas, Evanston, IL (US);
Tobin Jay Marks, Evanston, IL (US);
Udo C Pernisz, Midland, MI (US);
Dow Corning Corporation, Midland, MI (US);
Northwestern University, Evanston, IL (US);
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.