DataVXACS NanoPaper
journal article·2020-05-26Open access

Strong Differential Monovalent Anion Selectivity in Narrow Diameter Carbon Nanotube Porins

Zhongwu Li, Yuhao Li, Yun-Chiao Yao, Fikret Aydin, Cheng Zhan, Yunfei Chen, Menachem Elimelech, Tuan Anh Pham, Aleksandr Noy

ACS Nano· Volume 14· Issue 5
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Source abstract

Abstract

Inner pores of carbon nanotubes combine extremely fast water transport and ion selectivity that could potentially be useful for high-performance water desalination and separation applications. We used dye-quenching halide assays and stopped-flow spectrometry to determine intrinsic permeability of three small monovalent halide anions (chloride, bromide, iodide) and one pseudohalide anion (thiocyanate) through narrow 0.8 nm diameter carbon nanotube porins (CNTPs). These measurements revealed unexpectedly strong differential ion selectivity with permeabilities of different ions varying by up to 2 orders of magnitude. Removal of the negative charge from the nanotube entrance increased anion permeability by only a relatively small factor, indicating that electrostatic repulsion was not a major determinant of CNTP selectivity. First principle molecular dynamics simulations revealed that the origin of this strong differential ion selectivity is partial dehydration of anions upon entry into the narrow CNTP channels.
Source: openalex_inverted_index · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Nanopore and Nanochannel Transport Studies · Membrane-based Ion Separation Techniques · Membrane Separation Technologies

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States

Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China

School of Natural Sciences, University of California Merced, Merced, California 94343, United States

Quantum Simulations Group, Materials Science Division, Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550, United States

Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520, United States

Funding

Basic Energy Sciences · Government of Jiangsu Province · China Scholarship Council · Graduate School, Southeast University

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