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Graphene was prepared using liquid phase exfoliation and dispersed in an alumina matrix using an ultrasonication and powder processing route. Al 2 O 3 –graphene composites with up to 5vol% content were densified (>99%) using SPS. The fracture toughness of the material increased by 40% with the addition of only 0.8vol% graphene. However for higher graphene contents the improvement...
Liquid exfoliation of graphene generally results in flakes with lateral size of one micron or less on average, too small for many applications. In this paper we describe a method to separate an existing dispersion with mean flake length of ∼1μm into fractions, each with different mean flake size. The initial dispersion is centrifuged at a high centrifugation rate, separating small flakes in the supernatant...
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