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Angstrom-Scale Triangular Pore in Single-Layer Hexagonal Boron Nitride Membrane for Molecular Sieving.

Guangwei He1,2, Qianfeng Pan1, Zhe Yuan2

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.

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Summary

Researchers fabricated single-layer nanoporous hexagonal boron nitride (hBN) membranes with triangular nanopores. These membranes show high gas permeance and selectivity, advancing molecular sieving technology.

Keywords:
Gas separationHexagonal boron nitrideSingle‐layer membrane

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Single-layer crystalline films offer ideal separation membrane potential due to atomic thickness.
  • Challenges exist in creating membranes with well-defined nanopores for efficient molecular sieving.

Purpose of the Study:

  • To fabricate single-layer nanoporous hexagonal boron nitride (hBN) membranes with precisely controlled triangular nanopores.
  • To investigate the gas transport properties and selectivity of these novel membranes.

Main Methods:

  • Fabrication of single-layer nanoporous hBN membranes with high-density triangular nanopores.
  • Measurement of gas permeance (H2, CO2) and selectivity (H2/CH4, CO2/N2).
  • Development of mathematical models to describe gas transport properties.

Main Results:

  • Achieved high density of triangular nanopores (approx. 10^12 pores/cm^2) in single-layer hBN membranes.
  • Demonstrated H2 permeance of 5.43 × 10^-6 mol m^-2 s^-1 Pa^-1 with H2/CH4 selectivity of 14.7.
  • Showcased CO2 permeance of 1.37 × 10^-6 mol m^-2 s^-1 Pa^-1 with CO2/N2 selectivity of 12.3.
  • Validated mathematical models for predicting gas transport across atomically thin nanopores.

Conclusions:

  • Successfully fabricated novel single-layer nanoporous hBN membranes with unique triangular nanopores.
  • These membranes exhibit excellent gas separation performance, suitable for industrial applications.
  • Mathematical modeling provides critical insights into molecular transport mechanisms in nanoporous materials.