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Exponentially selective molecular sieving through angstrom pores.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Two-dimensional (2D) crystals are promising for advanced molecular separation.
  • Angstrom-scale pores are theoretically ideal for high selectivity and flow rates.
  • Experimental demonstration of such pores has been lacking.

Purpose of the Study:

  • To investigate gas transport through experimentally created angstrom-scale pores in 2D materials.
  • To characterize the selectivity and performance of these pores for molecular separation.
  • To understand the fundamental principles governing gas permeation through nanopores.

Main Methods:

  • Fabrication of 2D graphene pores using low-intensity, low-kilovolt electron beams.
  • Gas transport measurements using individual graphene pores.
  • Analysis of gas permeation based on molecular size and activation barriers.

Main Results:

  • Demonstrated gas transport through individual graphene pores with an effective diameter of approximately 2 angstroms.
  • Observed easy permeation of helium and hydrogen, while xenon and methane were effectively blocked.
  • Quantified activation barriers that increase quadratically with molecular kinetic diameter.

Conclusions:

  • The study provides the first experimental evidence of angstrom-scale pores in 2D materials for molecular separation.
  • Achieving exponential selectivity requires stringent pore size control and understanding of permeation physics.
  • The findings suggest fundamental limits on the performance of porous 2D membranes for separation applications.