Process for the continuous production of sub-micron two-dimensional materials such as graphene

A method of continuously separating a solid suspension containing submicron thickness laminar solid particles into a submicron thickness particle fraction suspension and a residual particle fraction suspension, the method comprising:

• providing a continuous centrifuge apparatus that comprises a disc stack centrifuge that comprises a disc angle, relative to an axis of rotation, within a range from 30° to 50°, a disc separation within a range from 1 mm to 20 mm, and a number of discs within a range from 10 to 100;
• providing the solid suspension;
• and
• separating the solid suspension in the continuous centrifuge apparatus into the submicron thickness particle fraction suspension and the residual particle fraction suspension;
• wherein the submicron thickness laminar solid particles comprise particles of partially delaminated graphite, hexagonal boron nitride, molybdenum disulphide, molybdenum diselenide, molybdenum ditelluride, tungsten disulphide, tungsten diselenide or other transition metal dichalcogenides.