Selection of Nonequilibrium Overlimiting Currents: Universal Depletion Layer Formation Dynamics and Vortex Instability
作者： Gilad Yossifon , Hsueh-Chia Chang
DOI: 10.1103/PHYSREVLETT.101.254501
关键词: Condensed matter physics 、 Non-equilibrium thermodynamics 、 Convection 、 Electrokinetic phenomena 、 Physics 、 Current (fluid) 、 Current density 、 Vortex 、 Instability 、 Front (oceanography)
摘要: DepartmentofChemicalandBiomolecularEngineering,CenterforMicrofluidicsandMedicalDiagnostics,UniversityofNotreDame,Notre Dame, Indiana 46556, USA(Received 16 July 2008; revised manuscript received 27 September published December 2008)The ion flux dynamics across a straight nanoslot is imaged to understand the nonequilibriumphenomenon of overlimiting current density nanoporous membrane. With slow ac field, anion-depletion front generated intermittently from one end nanochannel, and vortex instabilityfirst predicted by Rubinstein, Staude, Kedem [Desalination 69, 101 (1988).] found arrest self-similar diffusive growth. This electrokinetic instability evolves into stationary interfacial vortexarray that specifies current, independent external stirring or convective flow.
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