Continuous process for preparing pristine graphene nanoplatelets
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United States of America Patent
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Sep 15, 2020
Grant Date -
Jul 6, 2017
app pub date -
Jun 16, 2015
filing date -
Jun 20, 2014
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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.
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