We recently reported that the forward and backward current-potential curves cross at a non-zero cross-point in cyclic i-V measurements using single nanopipettes in ionic solutions. The cross-point separates a resistance-capacitance loop with normal phase shift from another one with negative phase shift. In this presentation, the transport behaviors of ions across a nanometer scale interface confined inside a single nanopipette are studied by steady-state and transient electroanalytical methods. A series of symmetric and asymmetric ionic concentrations inside and outside of the nanopipettes were employed. The nature of the nanoscale substrate-solution interface and its impact on the transport of ions against concentration gradient, the concept of ion pumping, will be discussed.

Normal and "negative" hysteresis loops in cyclic i-V measurement using single nanopipettes and pumping ions against concentration gradient

245th National Meeting (2013)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.