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Deprecated: Implicit conversion from float 267.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Sci+Rep 2015 ; 5 (ä): ä Nephropedia Template TP
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Ionic transport through sub-10?nm diameter hydrophobic high-aspect ratio nanopores: experiment, theory and simulation #MMPMID26036687
Balme S; Picaud F; Manghi M; Palmeri J; Bechelany M; Cabello-Aguilar S; Abou-Chaaya A; Miele P; Balanzat E; Janot JM
Sci Rep 2015[]; 5 (ä): ä PMID26036687show ga
Fundamental understanding of ionic transport at the nanoscale is essential for developing biosensors based on nanopore technology and new generation high-performance nanofiltration membranes for separation and purification applications. We study here ionic transport through single putatively neutral hydrophobic nanopores with high aspect ratio (of length L?=?6??m with diameters ranging from 1 to 10?nm) and with a well controlled cylindrical geometry. We develop a detailed hybrid mesoscopic theoretical approach for the electrolyte conductivity inside nanopores, which considers explicitly ion advection by electro-osmotic flow and possible flow slip at the pore surface. By fitting the experimental conductance data we show that for nanopore diameters greater than 4?nm a constant weak surface charge density of about 10?2?C m?2 needs to be incorporated in the model to account for conductance plateaus of a few pico-siemens at low salt concentrations. For tighter nanopores, our analysis leads to a higher surface charge density, which can be attributed to a modification of ion solvation structure close to the pore surface, as observed in the molecular dynamics simulations we performed.