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Updated: Dec 21, 2025
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Membrane Transport Processes Analyzed by a Highly Parallel Nanopore Chip System at Single Protein Resolution
Published on: August 16, 2016
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Molecular Transport across the Ionic Liquid-Aqueous Electrolyte Interface in a MoS2 Nanopore
Manish Shankla1, Aleksei Aksimentiev1
1Department of Physics, University of Illinois, 1110 West Green Street, Urbana, Illinois 61801, United States.
ACS Applied Materials & Interfaces
|May 13, 2020
Summary
Ionic liquids and MoS2 nanopores enable DNA sequencing by slowing translocation and enhancing nucleotide contrast. This study reveals the complex physics at the ionic liquid/aqueous interface, offering new nanopore sensing possibilities.
Area of Science:
- Nanotechnology
- Biophysics
- Materials Science
Background:
- Solid-state nanopores face challenges in DNA sequencing, including rapid translocation and low nucleotide current contrast.
- Biological nanopores use enzymes for controlled DNA threading, a method difficult to replicate in solid-state systems.
Purpose of the Study:
- To investigate the physical mechanisms behind using ionic liquids and MoS2 nanopores for improved DNA translocation and nucleotide discrimination.
- To characterize ion and DNA transport at the ionic liquid/aqueous electrolyte interface with and without a MoS2 nanopore.
Main Methods:
- All-atom molecular dynamics simulations were employed to model ion and DNA transport.
- The study analyzed the interface between an ionic liquid and an aqueous electrolyte, with and without a MoS2 nanopore.
Main Results:
- Partial miscibility of ionic liquids and aqueous electrolytes significantly alters nanopore translocation physics.
- A 600 mV contact potential was observed at the interface, with ionic current dominated by ionic liquid molecule movement.
- DNA nucleotides preferentially partitioned into the aqueous electrolyte, enabling spontaneous transport without external voltage.
Conclusions:
- The complex physics of the two-phase nanopore system presents novel opportunities for advancing nanopore-sensing platforms.
- Understanding these mechanisms is crucial for developing next-generation DNA sequencing technologies.
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