Phyllosilicate electrets and a method for their manufacture

Details Phyllosilicate electrets and a method for their manufacture Phyllosilicate electrets and a method for their manufacture

1988-02-03

1989-02-28

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Electrets

264 22, 29592E, 55155, G11C 1302, H01S 400, B03C 302

Patent

active

048088498

ABSTRACT:
An electret comprising an inherently charged material is provided. The material comprises phyllosilicate minerals and has external neutralizing ions removed therefrom or external ions added thereto. The electret is manufactured by either removing external ions from or adding external ions to a surface thereof. In a preferred embodiment, the electret is fabricated by placing the material between a pair of electrodes and immersing the material and electrodes in high-voltage insulating medium. A dc potential is then applied across the electrodes to create an electric field across the material. The duration of application of the dc potential is sufficient to provide a large surface charge on the material. The material is then separated from the electrodes while it is still immersed in the insulating medium. The separated material is then removed from the medium to obtain a substantially permanently charged electret.

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