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Updated: Apr 21, 2026

Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
Published on: August 16, 2016
Osmotically-driven transport in carbon nanotube porins
Kyunghoon Kim1, Jia Geng, Ramya Tunuguntla
1Biology and Biotechnology Division, Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory , Livermore, California 94550, United States.
Abstract:
We report the measurements of transport of ions and uncharged species through carbon nanotube (CNT) porins--short segments of CNTs inserted into a lipid bilayer membrane. Rejection characteristics of the CNT porins are governed by size exclusion for the uncharged species. In contrast, rejection of ionic species is governed by the electrostatic repulsion and Donnan membrane equilibrium. Permeability of monovalent cations follows the general trend in the hydrated ion size, except in the case of Cs(+) ions.
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