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Title: Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins

Abstract

Extreme confinement in nanometer sized channels can alter fluid and ion transport in significant ways, leading to significant water flow enhancement and unusual ion correlation effects. These effects are especially pronounced in carbon nanotube porins (CNTPs) that combine strong confinement in the inner lumen of carbon nanotubes with the high slip flow enhancement due to smooth hydrophobic pore walls. For this paper, we have studied ion transport and ion selectivity in 1.5 nm diameter CNTPs embedded in lipid membranes using single nanopore measurement setup. Our data show that CNTPs are weakly cation-selective at pH 7.5 and become non-selective at pH 3.0. Ion conductance of CNTPs exhibits an unusual 2/3 power law scaling with the ion concentration at both neutral and acidic pH values. Coupled Navier-Stokes and Poisson-Nernst-Planck (NS-PNP) simulations and atomistic Molecular Dynamics (MD) simulations reveal that this scaling originates from strong coupling between water and ion transport in these channels. These effects could result in development of a next generation of biomimetic membranes and carbon nanotube-based electroosmotic pumps.

Authors:
 [1];  [2];  [3]; ORCiD logo [3];  [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Univ. of California, Merced, CA (United States)
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Northeastern Univ., Boston, MA (United States)
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). The Center for Enhanced Nanofluidic Transport (CENT); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
OSTI Identifier:
1657684
Report Number(s):
LLNL-JRNL-780109
Journal ID: ISSN 1936-0851; 974823
Grant/Contract Number:  
AC52-07NA27344; SCW0972; SC0019112; 1710211; AC02-05CH11231; OCI-0725070; ACI-1238993
Resource Type:
Accepted Manuscript
Journal Name:
ACS Nano
Additional Journal Information:
Journal Volume: 13; Journal Issue: 11; Journal ID: ISSN 1936-0851
Publisher:
American Chemical Society (ACS)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Nanofluidics; Carbon nanotube porins; Ion transport; Slip-flow coupling; Electroosmosis

Citation Formats

Yao, Yun-Chiao, Taqieddin, Amir, Alibakhshi, Mohammad A., Wanunu, Meni, Aluru, Narayana R., and Noy, Aleksandr. Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins. United States: N. p., 2019. Web. doi:10.1021/acsnano.9b05118.
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Yao, Yun-Chiao, Taqieddin, Amir, Alibakhshi, Mohammad A., Wanunu, Meni, Aluru, Narayana R., & Noy, Aleksandr. Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins. United States. https://doi.org/10.1021/acsnano.9b05118
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Yao, Yun-Chiao, Taqieddin, Amir, Alibakhshi, Mohammad A., Wanunu, Meni, Aluru, Narayana R., and Noy, Aleksandr. Mon . "Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins". United States. https://doi.org/10.1021/acsnano.9b05118. https://www.osti.gov/servlets/purl/1657684.
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@article{osti_1657684,
title = {Strong Electroosmotic Coupling Dominates Ion Conductance of 1.5 nm Diameter Carbon Nanotube Porins},
author = {Yao, Yun-Chiao and Taqieddin, Amir and Alibakhshi, Mohammad A. and Wanunu, Meni and Aluru, Narayana R. and Noy, Aleksandr},
abstractNote = {Extreme confinement in nanometer sized channels can alter fluid and ion transport in significant ways, leading to significant water flow enhancement and unusual ion correlation effects. These effects are especially pronounced in carbon nanotube porins (CNTPs) that combine strong confinement in the inner lumen of carbon nanotubes with the high slip flow enhancement due to smooth hydrophobic pore walls. For this paper, we have studied ion transport and ion selectivity in 1.5 nm diameter CNTPs embedded in lipid membranes using single nanopore measurement setup. Our data show that CNTPs are weakly cation-selective at pH 7.5 and become non-selective at pH 3.0. Ion conductance of CNTPs exhibits an unusual 2/3 power law scaling with the ion concentration at both neutral and acidic pH values. Coupled Navier-Stokes and Poisson-Nernst-Planck (NS-PNP) simulations and atomistic Molecular Dynamics (MD) simulations reveal that this scaling originates from strong coupling between water and ion transport in these channels. These effects could result in development of a next generation of biomimetic membranes and carbon nanotube-based electroosmotic pumps.},
doi = {10.1021/acsnano.9b05118},
journal = {ACS Nano},
number = 11,
volume = 13,
place = {United States},
year = {2019},
month = {11}
}
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Journal Article:
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https://doi.org/10.1021/acsnano.9b05118
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