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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at the...
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Updated: Jun 9, 2026

Proof-of-Concept for Gas-Entrapping Membranes Derived from Water-Loving SiO2/Si/SiO2 Wafers for Green Desalination
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Tunable Gas-Liquid Separation by Surface Charge Modifications: Toward Membrane-Based Carbon Capture and Detection.

Jing Yang1, Haiou Zeng1, Ningran Wu1,2,3

  • 1National Key Laboratory of Advanced Micro and Nano Manufacture Technology, School of Integrated Circuits, Peking University, Beijing 100871, China.

Nano Letters
|June 8, 2026
PubMed
Summary

Pore-edge electrostatics in nanoporous graphene membranes (NGMs) significantly impact CO2 transport. Hydrophobic pores enhance CO2 permeance by reducing water blockage, crucial for climate mitigation and analytical technologies.

Keywords:
CO2 transportgas−liquid separationmolecular dynamics (MD)nanoporous graphene

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Published on: September 29, 2023

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Chemistry

Background:

  • Carbon capture is vital for climate mitigation and gas-liquid separation in analytical technologies.
  • Nanoporous graphene membranes (NGMs) offer a unique platform for studying gas transport at the atomic level.
  • Understanding CO2 transport mechanisms through NGMs at the gas-liquid interface is critical for optimizing these applications.

Purpose of the Study:

  • To investigate the CO2 transport mechanism through NGMs at the gas-liquid interface.
  • To elucidate the role of pore-edge electrostatics and interfacial hydration in modulating CO2 transport.
  • To identify strategies for enhancing CO2 permeance through NGMs.

Main Methods:

  • Utilizing all-atom molecular dynamics simulations.
  • Analyzing CO2 transport dynamics across various NGMs, including pristine, H-terminated, charged, and functionalized pores.
  • Quantifying the effects of pore-edge properties on interfacial water accumulation and CO2 permeance.

Main Results:

  • Pore-edge electrostatics strongly influence interfacial hydration, affecting CO2 transport.
  • Charged and functionalized pores promote water accumulation, suppressing CO2 transport.
  • Hydrophobic pores minimize water blockage, leading to enhanced CO2 permeance.
  • Interfacial hydration is identified as a key factor governing CO2 transport at the gas-liquid interface.

Conclusions:

  • Contrary to expectations, stronger electrostatic interactions can suppress CO2 transport by increasing interfacial hydration.
  • Hydrophobic pore engineering is a promising strategy to enhance CO2 permeance through NGMs.
  • These findings have implications for improving carbon capture technologies and carbon-based analytical devices.