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Efficient 3 He/ 4 He separation in a nanoporous graphenylene membrane.
Physical Chemistry Chemical Physics : PCCP 2017 August 17
Helium-3 is a precious noble gas, which is essential in many advanced technologies such as cryogenics, isotope labeling and nuclear weapons. The current imbalance of3 He demand and supply shortage leads to the search for an efficient membrane with high performance for3 He separation. In this study, based on first-principles calculations, we demonstrated that highly efficient3 He harvesting can be achieved in a nanoporous graphenylene membrane with industrially-acceptable selectivity and permeance. The quantum tunneling effect leads to3 He harvesting with high efficiency via kinetic sieving. Both the quantum tunneling effect and zero-point energy (ZPE) determine the3 He/4 He separation via thermally-driven equilibrium sieving, where the ZPE effect dominates efficient3 He/4 He separation between two reservoirs. The quantum effects revealed in this work suggest that the nanoporous graphenylene membrane is promising for efficient3 He harvesting that can be exploited for industrial applications.
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