期刊
ACS NANO
卷 14, 期 5, 页码 6269-6275出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c02423
关键词
nanofluidics; carbon nanotube porins; halide anions; ion selectivity; ion channels
类别
资金
- Center for Enhanced Nanofluidic Transport (CENT), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-SC0019112]
- Scientific Research Foundation of Graduate School of Southeast University [YBJJ1802]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX18_0067]
- China Scholarship Council [CSC 201806090020]
- U.S. Department of Energy [DE-AC52-07NA27344]
- Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy [DE-AC02-05CH11231]
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.
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