title: Autonomous pump against concentration gradient.
abstract: Using non-equilibrium molecular dynamics and Monte Carlo methods, we have studied the molecular transport in asymmetric nanochannels. The efficiency of the molecular pump depends on the angle and apertures of the asymmetric channel, the environmental temperature and average concentration of the particles. The pumping effect can be explained as the competition between the molecular force field and the thermal disturbance. Our results provide a green approach for pumping fluid particles against the concentration gradient through asymmetric nanoscale thin films without any external forces. It indicates that pumping vacuum can be a spontaneous process.
authors.affiliation: Siyuan laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.
authors.forename: Zhi-cheng
authors.initials: ZC
authors.lastname: Xu
authors.affiliation: Siyuan laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.
authors.forename: Dong-qin
authors.initials: DQ
authors.lastname: Zheng
authors.affiliation: Laboratory of Quantum Engineering and Quantum Materials, ICMP and SPTE, South China Normal University, Guangzhou 510006, China.
authors.forename: Bao-quan
authors.initials: BQ
authors.lastname: Ai
authors.affiliation: Siyuan laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou 510632, China.
authors.forename: Wei-rong
authors.initials: WR
authors.lastname: Zhong