Patent · US Active

Continuous process for preparing pristine graphene nanoplatelets

US10773954B2 · kind B2 · utility

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3References

7Claims

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Assignee

Directa Plus S.p.A. · IT

Inventors

Giulio Giuseppe Cesareo · Como, IT
Maria Riccardo Parrini · Milano, IT
Laura Giorgia Rizzi · Saronno, IT

Key dates

Filing date	Jun 16, 2015
Grant date	Sep 15, 2020
Priority date	—
Expiry date	Oct 25, 2036

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B2204/32
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Process for producing pristine graphene nanoplatelets, comprising the expansion of flakes of intercalated graphite and the collection thereof in water with formation of a dispersion in the substantial absence of surfactants, followed by an exfoliation and size reduction treatment carried out using ultrasonication of the aqueous dispersion or using high pressure homogenization thereof in a high shear homogenizer. A dispersion of pristine graphene is obtained in the form of nanoplatelets, at least 90% of which have a lateral size (x, y) from 50 to 50,000 nm and a thickness (z) from 0.34 to 50 nm, having a C/O ratio ≥100:1 and a high electrical conductivity.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.