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Asymmetric rotations slow down diffusion under confinement.

Zhiqiang Liu1, Xun Kan2, Mingbin Gao3

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Molecular rotation and translation coupling under confinement was investigated. Asymmetric molecules showed slower diffusion in zeolite pores due to specific interactions, contrary to expectations.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Understanding molecular diffusion, including translation and rotation, is crucial, especially within confined spaces like zeolite channels.
  • The coupling mechanism between rotational and translational motion under confinement remains poorly understood.

Purpose of the Study:

  • To provide evidence for the coupling between rotation and translation of molecules in confined environments.
  • To investigate the counterintuitive diffusion behavior of asymmetric molecules in zeolite channels.

Main Methods:

  • Utilized substituted benzene molecules as model systems.
  • Employed dynamic breakthrough curves, uptake measurements, quasi-elastic neutron scattering (QENS), and 2H solid-state Nuclear Magnetic Resonance (NMR) techniques.
  • Analyzed the influence of molecular shape and pore interactions on diffusion.

Main Results:

  • Observed that smaller, asymmetric molecules diffused slower than larger, symmetric molecules in confined zeolite channels.
  • Demonstrated that specific, selective interactions between asymmetric guests and zeolite pores increase local residence time, hindering translation.
  • Confirmed this behavior through various experimental techniques.

Conclusions:

  • Established a correlation between asymmetric rotation and diffusion under confinement.
  • Enhanced the fundamental understanding of the coupling between rotational and translational molecular motion.
  • Provided insights into diffusion processes in porous materials relevant to separation and catalysis.