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Abstract: The thermal evolution and dynamic properties of gold clusters with different number of particles are investigated by the molecular dynamics simulation during the cooling process. A comparison between the solidification of bulk system and that of the clusters shows that the clusters of different sizes will form different microstructures under the same cooling condition. Clusters with the larger number of particles transform from liquid-like to crystal-like structure discontinuously. In the smaller clusters, no similar structural transformations are found. The microstructure transition in the cooling process of gold clusters is dependent on the number of particles. By the calculation of the mean square displacements (MSDs) of different clusters, it shows that the MSDs of clusters during solidification have a close correlation with the structural transition behaviors. [Copyright &y& Elsevier]

• 3D rGCSs was fabricated using a one-step chemical deposition process on 3D reduced GOA. • The rGCSs demonstrated excellent antibacterial properties via colony counting experiments. • The antibacterial killing rate was up to 100% for E. coli and S. aureus. • rGCSs is an ideal antibacterial candidate for practical applications in sewage systems. Three-dimensional (3D) graphene/nano-copper scaffolds (rGCSs) was fabricated using a one-step chemical deposition on 3D reduced graphene oxide architecture (rGOA). The nano-copper was conformably grown on the rGOA substrate with a uniform morphology. Due to combined effects between the graphene skeleton and the nano-copper, the rGCSs demonstrated excellent antibacterial properties in the colony counting experiments. In addition, an rGCSs device was designed to further investigate the antibacterial performance for sewage management. The antibacterial killing rate was up to 100% for Escherichia coli and Staphylococcus aureus, and the nano-copper deposits were immobilized on the reduced graphene oxide sheets during the circulation process. This suggests that rGCSs is a highly-efficient antibacterial candidate for practical applications in sewage systems. [ABSTRACT FROM AUTHOR]