Scanning ion conductance microscopy (SICM) was used to interrogate ion currents emanating from nanometer-scale pores of a polymer membrane. The transport activity of individual pores was measured by examining ion current images and corresponding topographic images recorded simultaneously. Localized ion currents over individual nanopores were generated by introducing a concentration difference b...

Electronic control over the generation, transport, and delivery of ions is useful in order to regulate reactions, functions, and processes in various chemical and biological systems. Different kinds of ion diodes and transistors that exhibit non-linear current versus voltage characteristics have been explored to generate chemical gradients and signals. Bipolar membranes (BMs) exhibit both ion c...

introduction: the cystic fibrosis transmembrane conductance regulator (cftr) chloride (cl−) channel is an essential component of epithelial cl− transport systems in many organs. cftr is mainly expressed in the lung and other tissues, such as testis, duodenum, trachea and kidney. the ubiquitin ligase neural precursor cells expressed developmentally down-regulated protein 4-2 (nedd4-2) has previo...

Floating potential and ion current density measurements were taken on the laboratory model NASA-173Mv2 in order to improve understanding of the physical processes affecting Hall thruster performance at high specific impulse. Floating potential was measured on discharge chamber centerline over axial positions spanning 10 mm from the anode to 100 mm downstream of the exit plane. Ion current densi...