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Mass Transfer in Boronate Ester 2D COF Single Crystals.

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Two-dimensional covalent organic frameworks (2D COFs) show high porosity for membrane separation. Molecular permeation in 2D COFs reveals adsorption-mediated flow, deviating from traditional diffusion laws for aromatic hydrocarbons.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Two-dimensional covalent organic frameworks (2D COFs) possess intrinsic porosity and tunable pore sizes, offering potential advantages over inorganic membranes for separation processes.
  • The lack of laterally extended, free-standing membranes has hindered the study of mass transport phenomena in 2D COFs.

Purpose of the Study:

  • To investigate molecular permeation through single crystals of an interfacially synthesized boronate ester 2D COF.
  • To quantify the areal porosity and understand gas and aromatic hydrocarbon transport mechanisms in 2D COF nanosheets.

Main Methods:

  • Direct molecular permeation measurements were conducted on suspended single crystals of a boronate ester 2D COF.
  • Atmospheric gases, noble gases, and aromatic hydrocarbons (benzene, toluene, xylene) were used to probe transport properties.
  • Areal porosity was quantified, and permeation rates were analyzed in relation to molecular size, mass, and potential adsorption effects.

Main Results:

  • The 2D COF membranes exhibited high areal porosity (nearly 40%), facilitating rapid permeation of atmospheric and noble gases.
  • Transport of aromatic hydrocarbons deviated from Graham's law, with increasing permeation rates observed for benzene, toluene, and xylene, contrary to expectations based on molecular size and mass.
  • The observed transport behavior suggests the significant role of adsorption-mediated flow in microporous planar nanomaterials.

Conclusions:

  • Interfacially synthesized 2D COFs can form free-standing membranes suitable for direct permeation studies.
  • Adsorption-mediated flow is a critical transport mechanism in 2D COFs, influencing the separation of molecules based on interactions beyond simple size exclusion.
  • These findings highlight the potential of 2D COFs for advanced membrane separation applications.