Osmotically-Driven Transport\nin Carbon Nanotube Porins

Abstract

We\nreport the measurements of transport of ions and uncharged species\nthrough carbon nanotube (CNT) porinsshort segments of CNTs\ninserted into a lipid bilayer membrane. Rejection characteristics\nof the CNT porins are governed by size exclusion for the uncharged\nspecies. In contrast, rejection of ionic species is governed by the\nelectrostatic repulsion and Donnan membrane equilibrium. Permeability\nof monovalent cations follows the general trend in the hydrated ion\nsize, except in the case of Cs⁺ ions.