Abstract

Water filling of carbon nanotube bores in the 4-15 nm diameter range is experimentally evaluated by means of tracking proton transport through a carbon nanotube membrane. A membrane with empty bores is installed between to reservoirs, one containing a significant concentration of free protons. Water fills nanotube bores allowing for voltage-motivated transport of protons from a region of high concentration to a region of low concentration, which is monitored by means of a pH indicator. Overall rate of proton transport can be broken into two components - the rate of water filling empty bores and the rate of proton transport through those bores.

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