Gas permeation through graphdiyne-based nanoporous membranes
Nanoporous membranes based on two dimensional materials are predicted to provide highly selective gas transport in combination with extreme permeability. Here we investigate membranes made from multilayer graphdiyne, a graphene-like crystal with a larger unit cell. Despite being nearly a hundred of...
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| creator | Zhou, Zhihua Tan, Yongtao Yang, Qian Bera, Achintya Xiong, Zecheng Yagmurcukardes, Mehmet Kim, Minsoo Zou, Yichao Wang, Guanghua Mishchenko, Artem Timokhin, Ivan Wang, Canbin Wang, Hao Yang, Chongyang Lu, Yizhen Boya, Radha Liao, Honggang Haigh, Sarah Liu, Huibiao Peeters, Francois M Li, Yuliang Geim, Andre K Hu, Sheng |
| description | Nanoporous membranes based on two dimensional materials are predicted to provide highly selective gas transport in combination with extreme permeability. Here we investigate membranes made from multilayer graphdiyne, a graphene-like crystal with a larger unit cell. Despite being nearly a hundred of nanometers thick, the membranes allow fast, Knudsen-type permeation of light gases such as helium and hydrogen whereas heavy noble gases like xenon exhibit strongly suppressed flows. Using isotope and cryogenic temperature measurements, the seemingly conflicting characteristics are explained by a high density of straight-through holes (direct porosity of ~0.1%), in which heavy atoms are adsorbed on the walls, partially blocking Knudsen flows. Our work offers important insights into intricate transport mechanisms playing a role at nanoscale. |
| doi_str_mv | 10.48550/arxiv.2207.00731 |
| format | Article |
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Here we investigate membranes made from multilayer graphdiyne, a graphene-like crystal with a larger unit cell. Despite being nearly a hundred of nanometers thick, the membranes allow fast, Knudsen-type permeation of light gases such as helium and hydrogen whereas heavy noble gases like xenon exhibit strongly suppressed flows. Using isotope and cryogenic temperature measurements, the seemingly conflicting characteristics are explained by a high density of straight-through holes (direct porosity of ~0.1%), in which heavy atoms are adsorbed on the walls, partially blocking Knudsen flows. 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| subjects | Cryogenic temperature Gas permeation Gas transport Graphene Knudsen flow Membranes Multilayers Penetration Physics - Mesoscale and Nanoscale Physics Rare gases Two dimensional materials Unit cell Xenon |
| title | Gas permeation through graphdiyne-based nanoporous membranes |
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