Articles
Current Applied Physics (15671739)79pp. 66-76
This study uses molecular dynamics simulations to investigate the efficient separation of lithium (Li+) and sodium (Na+) ions in graphene-based nano-channels under the influence of an electric field. The effect of nano-channel dimensions, including length and width, on the ion separation performance was investigated. Our results show that nano-channels with a length of 12 nm and a width of 1.5 nm exhibit optimal ion separation at the present electric field intensity of 4 mV/Å, with lithium ions preferentially accumulating in the designated storage compartments. This separation efficiency is primarily due to the mass-dependent electrophoretic mobility of the ions, with lithium ions migrating faster than sodium ions in the same electric field due to their lower mass and higher acceleration. In addition, the narrow channel width provides a more controlled laminar flow, minimizing turbulence and improving ion transport selectivity. This study also highlights the role of thermal effects, ion diffusion, and electrostatic interactions with the graphene surface in improving the separation process. © 2025 Korean Physical Society
Surfaces and Interfaces (24680230)72
The coalescence-induced jumping of saline nanodroplets under the influence of an oscillating electric field is investigated via molecular dynamics simulations. This study systematically explores how droplet size, ionic concentration, and substrate wettability affect the dynamics of droplet coalescence and detachment. Three droplet configurations—pure-pure, pure-saline, and saline-saline—are analyzed on substrates of varying hydrophobicity, both with and without the application of an external electric field. Results show that increased ion concentration delays coalescence and suppresses jumping due to the nanoscale interfacial effects which increase energy dissipation. Increasing the substrates hydrophobicity and applying oscillating electric fields improve energy conversion and momentum transfer in saline systems by promoting charge redistribution and reducing adhesion losses. Smaller droplets demonstrate greater sensitivity to electric fields, further amplifying their jumping response. These insights provide a molecular-level understanding of nanoscale droplet jumping, which may aid in optimizing electrostatic demulsification and condensation technologies. © 2025 Elsevier B.V.
European Physical Journal B (14346028)97(2)
Studying the phase transition process from free flow to congested state in communication networks is one of the hot topics of dynamically complex systems, and many related theoretical and computational efforts have been made to improve traffic systems’ organization and load management. A criterion to measure the organization efficiency of the system is the formation process of a global traffic flow cluster from local small clusters in a communication network which can be evaluated by measuring the percolation threshold. While little attention has been paid to percolation in such studies, in this research, the traffic percolation threshold is defined based on the system nodes’ loads to examine the influences of the network structures, different routing strategies, and distributions of transmission capacities on the efficiency of the communication networks. Considering the obtained results, it was found any variation in the network structure and traffic control strategies that leads to a rather diverse load distribution among the system’s nodes can organize traffic loads more efficiently. Graphical abstract: (Figure presented.) © The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2024.
