Coating processes – Electrical product produced – Electron emissive or suppressive
Patent
1994-07-12
1995-11-21
Bell, Janyce
Coating processes
Electrical product produced
Electron emissive or suppressive
4271263, 427226, 427240, 427243, 4274301, B05D 512
Patent
active
054685141
ABSTRACT:
A method of producing a pH-responsive membrane by coating a substrate with an anhydrous coating solution of tantalum alkoxide. In a first preferred embodiment, an anhydrous tantalum alkoxide solution is deposited drop by drop on a surface of an electrode substrate which is rapidly rotating to form a film of tantalum alkoxide. After drying to remove the solvent, the electrode is baked to decompose the tantalum alkoxide, thereby forming a pH-responsive membrane of tantalum pentoxide. The thickness of this membrane can be controlled by altering the speed of substrate rotation and the volume of coating solution deposited thereon. In a second preferred embodiment, an electrode substrate is immersed in an anhydrous coating solution of a tantalum alkoxide followed by pulling the electrode substrate from the solution at a controlled rate to form a tantalum alkoxide film which is then converted to a pH-responsive membrane of tantalum pentoxide by drying and baking.
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Materials Research Society Symposia Proceedings vol. 180, 1990, Pittsburgh US pp. 611-616; H. Hirashima et al.; `Densification and crystallization of thin transition metal oxide coatings from metal alkoxides` *the whole document* & Better Ceramics Through Chemistry IV Symposium 15-20 Apr. 1990. San Francisco US.
Bell Janyce
Horiba Ltd.
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