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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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Sulfur-doped crown ether graphane for enhanced helium separation.

Qinglan Zhao1, Yingying Fu1, Xiaxia Gong1

  • 1Department of Optical Engineering, College of Optical, Mechanical and Electrical Engineering, Zhejiang A&F University, Hangzhou, Zhejiang, 311300, P. R. China. jingxu@zafu.edu.cn.

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This study introduces a sulfur-doped crown ether graphane membrane (CG-S6) for efficient helium separation. The novel membrane demonstrates significantly enhanced selectivity and separation barriers, outperforming existing materials.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Computational Chemistry

Background:

  • Efficient helium (He) separation is critical for high-tech industries.
  • Existing membranes struggle with limited selectivity and efficiency for He separation.

Purpose of the Study:

  • To investigate the potential of a sulfur-doped crown ether graphane membrane (CG-S6) for enhanced He separation.
  • To systematically assess the separation barriers and selectivity of CG-S6 against common atmospheric gases using first-principles calculations.

Main Methods:

  • First-principles calculations were employed to evaluate thermodynamic stability, electronic band structure, optical properties, and gas separation barriers.
  • The performance of CG-S6 was compared against the original CG-6 membrane and other established porous materials.

Main Results:

  • CG-S6 exhibits excellent thermodynamic stability with a reduced band gap (2.73 eV) due to sulfur doping.
  • The membrane shows significantly lower He separation barriers (0.20 eV) compared to other gases (Ne, Ar, N2, CH4).
  • CG-S6 achieves remarkable He selectivity (331.15 to 1 × 10^20) over a wide temperature range (0-600 K).

Conclusions:

  • Sulfur doping is an effective strategy for enhancing the He separation performance of graphane-based membranes.
  • CG-S6 presents a promising candidate for developing high-performance, He-selective membranes.
  • The study offers a new theoretical perspective for designing advanced membrane materials for gas separation.