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Title: Exponentially selective molecular sieving through angstrom pores
Authors: Sun, Pengzhan
Yağmurcukardeş, Mehmet
Zhang, R.
Kuang, Wenjun
Lozada-Hidalgo, Marcelo
Liu, B. L.
Geim, Andre K.
University of Manchester
Izmir Institute of Technology
University of Manchester
University of Manchester
University of Manchester
Tsinghua University
University of Manchester
Keywords: 2D materials
Angstrom pores
Issue Date: Dec-2021
Publisher: Nature Publishing Group
Abstract: Two-dimensional crystals with angstrom-scale pores are widely considered as candidates for a next generation of molecular separation technologies aiming to provide extreme, exponentially large selectivity combined with high flow rates. No such pores have been demonstrated experimentally. Here we study gas transport through individual graphene pores created by low intensity exposure to low kV electrons. Helium and hydrogen permeate easily through these pores whereas larger species such as xenon and methane are practically blocked. Permeating gases experience activation barriers that increase quadratically with molecules’ kinetic diameter, and the effective diameter of the created pores is estimated as ∼2 angstroms, about one missing carbon ring. Our work reveals stringent conditions for achieving the long sought-after exponential selectivity using porous two-dimensional membranes and suggests limits on their possible performance.
Description: This work was supported by European Research Council (grant 786532 VANDER), the Engineering and Physical Sciences Research Council (grant EP/S030719), Lloyd’s Register Foundation and National Natural Science Foundation of China (grant #51920105002).
Appears in Collections:Photonics / Fotonik
PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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