3 years ago

Wave Packet Calculations of the Quantum Transport of Atoms through Nanoporous Membranes

Wave Packet Calculations of the Quantum Transport of Atoms through Nanoporous Membranes
Alfonso Gijón, Marta I. Hernández, José Campos-Martínez
Quantum phenomena are relevant to the transport of light atoms and molecules through nanoporous membranes. Indeed, confinement provided by (sub)nanometer pores enhances quantum effects such as tunneling and zero point energy (ZPE), even leading to quantum sieving of different isotopes of a given element. In this work, we apply rigorous wave packet techniques to the simulation in the three-dimensional space of the passage of atoms through periodic rigid one-atom-thick membranes. We aim to assess more approximate quantum models such as one-dimensional tunneling calculations or transition state theory (TST). Calculations are reported for the transmission of 3He and 4He through graphdiyne as well as through a holey graphene model. For He–graphdiyne, conclusions from tunneling-corrected TST are confirmed: both tunneling and ZPE effects are significant, but competition between each other leads to a moderately small 4He/3He selectivity, in stark contrast with predictions from one-dimensional tunneling calculations. For the transport of He isotopes through leaky graphene, the computed transmission probabilities are highly structured suggesting widespread selective adsorption resonances and, this time, rate coefficients and selectivity ratios do not agree well with estimations from TST. This study intends to go one step further toward a better understanding of the quantum-mechanical processes in the transport of gases through nanoporous membranes.

Publisher URL: http://dx.doi.org/10.1021/acs.jpcc.7b04298

DOI: 10.1021/acs.jpcc.7b04298

You might also like
Never Miss Important Research

Researcher is an app designed by academics, for academics. Create a personalised feed in two minutes.
Choose from over 15,000 academics journals covering ten research areas then let Researcher deliver you papers tailored to your interests each day.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.