pi(+)-pi(+) stacking of imidazolium cations enhances molecular layering of room temperature ionic liquids at their interfaces

The interfacial structure of room temperature ionic liquids (RTILs) controls many of the unique properties of RTILs, such as the high capacitance of RTILs and the efficiency of charge transport between RTILs and electrodes. RTILs have been experimentally shown to exhibit interfacial molecular layering structures over a 10 angstrom length scale. However, the driving force behind the formation of these layered structures has not been resolved. Here, we report ab initio molecular dynamics simulations of imidazolium RTIL/air and RTIL/graphene interfaces along with force field molecular dynamics simulations. We find that the pi(+)-pi(+) interaction of imidazolium cations enhances the layering structure of RTILs, despite the electrostatic repulsion. The length scales of the molecular layering at the RTIL/air and RTIL/graphene interfaces are very similar, manifesting the limited effect of the substrate on the interfacial organization of RTILs.German Science Foundation [TRR146]SCI(E)ARTICLE42850-28561

Vibrational couplings and energy transfer pathways of water's bending mode

Yu, CC., Chiang, KY., Okuno, M. et al. Vibrational couplings and energy transfer pathways of water’s bending mode. Nat Commun 11, 5977 (2020). https://doi.org/10.1038/s41467-020-19759-

Rotor design of a novel self-start type permanent magnet synchronous motor

Recently, permanent magnet type synchronous motor has been used widely for industry application. In the paper, we propose a novel self-start type permanent magnet synchronous motor with squirrel-cage and analyze the basic characteristics of the motor. We try to increase the efficiency by the rotor design with the finite element analysis.15th International Conference on Electrical Machines and Systems, ICEMS 2012; Sapporo; Japan; 21 October 2012 ～ 24 October 201