Characterization of the asymmetric action of a single pore in a track-etched membrane

Transport properties of a single pore in a track-etched poly(ethylene terep hthalate) membrane are characterized using statistical analysis. Probabilit y density function, autocorrelation function, power spectrum, Hurst and det rended fluctuation analysis, as well as Grey's index were the tools used to characterize the ion current behavior. The examined pore is conical in sha pe and has been obtained by one-sided electric field stopped etching. The p ore has a highly nonlinear diode-like current-voltage characteristic, with preferential flow of ions in one direction. We show that the examined curre nt fluctuations at -2V and +2V, however looking very similar, reflect diffe rences in action of the system at the two polarities. The existence of long er memory for the weaker signal, recorded at -2V, has been found.