Concentration dependence of ionic conductance measured with ion-selective sub-micro pipette probes in aqueous sodium and potassium chloride solutions
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作者:
Son, J. W.
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Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South KoreaKonkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Son, J. W.
[1
]
Takami, T.
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Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South KoreaKonkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Takami, T.
[1
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Lee, J-K.
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Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South KoreaKonkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Lee, J-K.
[1
]
Kawai, T.
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Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South KoreaKonkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Kawai, T.
[1
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Park, B. H.
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Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South KoreaKonkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Park, B. H.
[1
]
机构:
[1] Konkuk Univ, Div Quantum Phases & Devices, Dept Phys, Seoul 143701, South Korea
Selective ionic currents in aqueous sodium and potassium chloride solutions with concentrations from 0.01 M to 1.0 M were measured using sub-micro pipette probes in which a poly(vinyl chloride) film containing crown ethers selectively filtered sodium or potassium ions. The selective ionic currents were monitored with a sub-picoampere current measurement system developed from the techniques of T Omega-gap impedance scanning tunneling microscopy. The ionic currents increased with the concentration of the corresponding solution, and thus these sub-micro pipette probes can be applied to detect local ionic concentration of a specific ion in living cells with ionic concentration higher than 0.1 M. (C) 2011 American Institute of Physics. [doi:10.1063/1.3615281]