Scalable methods for fractioning of graphene and nano-graphite

Important results from the project

During the project, we have succeeded in identifying several large-scale processes with the potential to separate different fractions of graphene and nano-graphite from water-based suspensions containing a mixture of these, as well as to be able to separate graphene and nano-graphite from other components (e.g. impurities) in the suspension. Such a large-scale method has been able to be tested and evaluated with positive results map separation of graphene and nano-graphite based on the thickness of the flake.

Expected long term effects

The properties of the suspensions that are fractionated and how these properties affect the fractionation in various processes have been clarified. A number of known industrial processes with good potential to meet the criteria for fractionation have been identified. A large-scale process has been evaluated and proven to separate graphitic materials based on their thickness, with a precision of <5 layers. the efficiency and capacity of the process varies greatly with changes in the properties of the suspensions, and process parameters need to be adjusted accordingly.>

Approach and implementation

Separating the project into 3 work packages with different focuses was fortunate. The WPs required different resources and competence, and it allowed for the work to proceed more efficiently. The plan was adjusted slightly during the course of the project in order to make the best use of both time and resources, but overall the work progressed according to plan. That the project covered activities between low and high TRL was valuable. The results from the laboratory studies needed translation to be made relevant to the large-scale process, through which much was learned.