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Graphene nanosheets (GNS) are the promising nano-reinforcements to fabricate bulk graphene-metal composites due to their excellent mechanical properties and large yield. However, the effective synthesis of such bulk graphene reinforced magnesium (Mg) composites remains challenging because of the poor interfacial bonding and the aggregation of GNS. Here, GNS possessing about 12 at. % residual oxygen...
Graphene oxide (GO) membranes represent a next generation of high-flux, ultra-lightweight and energy-efficient membranes for molecular and ionic separation in aqueous solution. In this work, we fabricate free-standing GO membranes with tunable thickness via facile vacuum filtration process. The effect of electrostatic interaction on the separation performance of GO membrane for organic dyes was demonstrated...
Capacitive deionization (CDI) is an emerging desalination technology that has attracted wide attention. Generally, porous carbons with high specific surface area are considered as ideal electrode materials for CDI application. Despite the progress achieved to date, synthesis of porous carbons with a controllable specific surface area has rarely succeeded. To address this issue, here a new strategy...
We have systematically investigated the structural and magnetic properties of N-doped graphene oxide by density-functional theory. Our results reveal that both the magnetic properties and the defect stability can be significantly affected by the bonding environment. Graphitic N defect has higher formation energy than both pyridinic and pyrrolic N defects. The pyrrolic N becomes more stable when its...
Carbon nanotubes (CNTs) are novel reinforcement of Mg-based composites because of their attractive mechanical properties. However, in general, nanosize CNTs did not completely impart their exceptional properties to the Mg matrix because of the poor interfacial bonding between CNTs and the matrix and the aggregation of CNTs, which largely limit their applications in Mg-based composites. In this study,...
A one-step and cost-efficient strategy to prepare carbon and dielectric composites with a skeleton–skin structure by a sol–gel method has been proposed. For the model system in the present work, i.e. C–TiO2 composite films, the insight of the wet chemical mechanisms in sols was illustrated by the electrical compensation theory. The structure and carbon crystallization evolutions with annealing process...
Water vapor-assisted chemical vapor deposition was used to prepare vertically-aligned carbon nanotubes (ANTs) on a quartz substrate by using ferrocene as a catalyst precursor and xylene as a carbon source. The morphologies of the ANTs were investigated by TEM and SEM. Results showed that under optimized growth conditions ANTs were grown on the substrate with an area of 60×140mm 2 and a thickness...
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