Method for producing thin graphite flakes with large aspect rati

Details Method for producing thin graphite flakes with large aspect rati Method for producing thin graphite flakes with large aspect rati

1991-11-12

1993-02-16

Langel, Wayne

Chemistry of inorganic compounds

Carbon or compound thereof

Elemental carbon

C01B 3104

Patent

active

051869195

ABSTRACT:
A method for making graphite flakes of high aspect ratio by the steps of providing a strong concentrated acid and heating the graphite in the presence of the acid for a time and at a temperature effective to intercalate the acid in the graphite; heating the intercalated graphite at a rate and to a temperature effective to exfoliate the graphite in discrete layers; subjecting the graphite layers to ultrasonic energy, mechanical shear forces, or freezing in an amount effective to separate the layes into discrete flakes.

REFERENCES:
patent: 3409563 (1968-11-01), Olstowski
patent: 3560155 (1971-02-01), Olstowski et al.
patent: 4091083 (1978-05-01), Hirschuogel et al.
patent: 4888242 (1989-12-01), Matsuo et al.
patent: 4895713 (1990-01-01), Greinke et al.
patent: 4961988 (1990-10-01), Zhu

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