FULLEREN PREPARATION METHOD Russian patent published in 2004 - IPC

FIELD: carbon materials.

SUBSTANCE: invention is intended for use in manufacture of drugs, diamond films, power sources, and composites. Naturally occurring mineral namely schungite, with ash content 0.5 to 9% is crushed, ground, and sized to give product with dispersity from 2 to 0.005 mcm^-1. Product is subjected to heat treatment in vacuum or under protective gas atmosphere within temperature range 100 to 180^oC and with temperature raise rate 10 to 60^oC/min. Condensed fullerens are stepwise sublimed with temperature jumps 200-400^oC between steps. Number of steps may reach 10. When necessary, prior to be used, schungite may be subjected to gravitational and/or chemical concentration.

EFFECT: simplified preparation of starting material, intensified process, and improved quality of fullerene concentrate due to narrowed fractional composition thereof.

2 cl, 1 tbl, 3 ex