Accession Number : ADD015645

Title :   Nanochannel Filter.

Descriptive Note : Patent Application, Filed 12 Jun 92,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Tonucci, Ronald J ; Justus, Brian

Report Date : 12 Jun 1992

Pagination or Media Count : 29

Abstract : The present invention provides a wafer-like glass filter having channels therethrough having an average diameter of less than 1 micron: The invention also provides a method for forming such a filter comprising the steps of: inserting acid etchable glass rods into respective inert hollow glass tubes; heating said rods and tubes to fuse each respective rod to a respective tube; drawing each of said fused rods and tubes to reduce the diameter of the rods and tubes to thereby form a filament; stacking a plurality of said filaments together to form a stack of filaments; heating the stack of filaments to fuse the filaments together to form an elongated bar having a plurality of channels filled with etchable glass; drawing said bar until each of the channels has a diameter of less than 1 micron; cutting the elongated bar to form a wafer-like filter; annealing the filter at an elavated temperature; and acid etching the etchable glass in the wafer-like filter to form channels therethrough having an average diameter of less than about 1 micron.

Descriptors :   *FILTERS, *ULTRAFILTRATION, FILAMENTS, WAFERS, GLASS, TUBES, RODS

Subject Categories : Textiles

Distribution Statement : APPROVED FOR PUBLIC RELEASE