Tube having regions of different surface chemistry

Details Tube having regions of different surface chemistry Tube having regions of different surface chemistry

1994-01-26

1995-05-30

Santiago, Amalia L.

Chemical apparatus and process disinfecting, deodorizing, preser

Control element responsive to a sensed operating condition

73864, 7386401, 7386473, 7386471, 128760, 128763, 422 99, B01L 314

Patent

active

054198720

ABSTRACT:
In a method to modify the chemistry of a portion of the surface of an article, the surface is placed adjacent an electrode in a plasma chamber, the distance to the wall of the chamber being at least five times the size of the electrode. A plasma of very high power density is generated in a discharge volume surrounding the electrode so that the surface area closest to the electrode receives a very intense plasma which diminishes with increasing distance from the discharge volume thus forming a chemical gradient on the article surface. The preferred article is a tube having one closed end, and the gradient may be formed from either the closed end or the open end. The gradient may be of decreasing glass-like character or decreasing plastic-like character.

REFERENCES:
patent: 4967763 (1990-11-01), Nugent et al.
patent: 5246666 (1991-09-01), Vogler et al.
patent: 5257633 (1993-11-01), Vogler et al.
Webster's Ninth New Collegiate Dictionary, Merriam-Webster Inc., Springfield, Mass., 1986, p. 520.

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