2010/07/31 by Christophe Tasserit, C. Tasserit, A. Koutsioumpas +5 · 2 citations
Engineering · Physics and Astronomy · #Fuel Cells and Related Materials #Microfluidic and Capillary Electrophoresis Applications #Nanopore and Nanochannel Transport Studies #cond-mat.dis-nn #cond-mat.mes-hall #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.105.260602
arxiv created 2010/09/09 · openalex publication_date 2010/12/22 · arxiv updated 2011/01/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We report voltage-clamp measurements through single conical nanopore obtained by chemical etching of a single ion track in polyimide film. Special attention is paid to the pink noise of the ionic current (i.e., 1/f noise) measured with different filling liquids. The relative pink-noise amplitude is almost independent of concentration and pH for KCl solutions, but varies strongly using ionic liquids. In particular, we show that depending on the ionic liquid, the transport of charge carriers is strongly facilitated (low noise and higher conductivity than in the bulk) or jammed. These results show that the origin of the pink noise can be ascribed neither to fluctuations of the pore geometry nor to the pore wall charges, but rather to a cooperative effect on ions motion in confined geometry.