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Graphene has received abundant attentions in many applications because of its extraordinary properties. Liquid-phase exfoliation is one of the most important methods to obtain graphene from graphite. However, due to strong van der Waals interaction force, it is still extremely challenging to further improve the exfoliation efficiency. Here we report that by carrying out reductions with the oxygenic...
A facile and high-efficient approach for the preparation of graphene quantum dots (GQDs) is reported. With the assistance of KO2 in the hydrothermal cutting graphene oxide (GO), a conversion rate of ∼35 wt% from GO to GQDs is achieved. The as-prepared GQDs display rarely observed yellow emissive photoluminescence with a respectable quantum yield of 8.9% in H2O. Moreover, the GQDs are further demonstrated...
Carbon fiber/bismaleimide composites have received increasing interest, owing to their excellent properties, especially their toughness under extreme working conditions. We established a micromechanical model for a finite element simulation of the micro-droplet test, which involves pulling a carbon fiber out of a bead of matrix using two moving knives acting on the bead as scrapers to quantify the...
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