TY - JOUR
T1 - Selection of nonequilibrium overlimiting currents
T2 - Universal depletion layer formation dynamics and vortex instability
AU - Yossifon, Gilad
AU - Chang, Hsueh Chia
PY - 2008/12/15
Y1 - 2008/12/15
N2 - The ion flux dynamics across a straight nanoslot is imaged to understand the nonequilibrium phenomenon of overlimiting current density across a nanoporous membrane. With a slow ac field, an ion-depletion front is generated intermittently from one end of the nanochannel, and a vortex instability first predicted by Rubinstein, Staude, and Kedem is found to arrest the self-similar diffusive front growth. This electrokinetic instability evolves into a stationary interfacial vortex array that specifies the overlimiting current, independent of external stirring or convective flow.
AB - The ion flux dynamics across a straight nanoslot is imaged to understand the nonequilibrium phenomenon of overlimiting current density across a nanoporous membrane. With a slow ac field, an ion-depletion front is generated intermittently from one end of the nanochannel, and a vortex instability first predicted by Rubinstein, Staude, and Kedem is found to arrest the self-similar diffusive front growth. This electrokinetic instability evolves into a stationary interfacial vortex array that specifies the overlimiting current, independent of external stirring or convective flow.
UR - http://www.scopus.com/inward/record.url?scp=57949116132&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.101.254501
DO - 10.1103/PhysRevLett.101.254501
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AN - SCOPUS:57949116132
VL - 101
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 25
M1 - 254501
ER -