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Related Experiment Videos

Spatial confinement effect on the atomic structure of solid argon.

Kengo Nishio1, Wataru Shinoda, Tetsuya Morishita

  • 1Research Institute for Computational Sciences (RICS), National Institute of Advanced Science and Technology (AIST), Central 2, Umezono 1-1-1, Tsukuba, Ibaraki 305-8568, Japan. k-nishio@aist.go.jp

The Journal of Chemical Physics
|April 20, 2005
PubMed
Summary

Confined argon (Ar) in nanopores exhibits unique freezing behaviors. Smaller pores (10sigma) promote amorphous Ar formation, even when bulk Ar crystallizes, suggesting nano-molds can create stable amorphous structures.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Molecules confined in nanoporous materials display properties distinct from their bulk counterparts.
  • Understanding phase transitions in confined systems is crucial for designing novel materials and devices.
  • Argon (Ar) is typically a poor glass former, making the formation of amorphous structures challenging.

Purpose of the Study:

  • To investigate the freezing behavior of argon (Ar) confined within nanopores using molecular dynamics simulations.
  • To explore the influence of pore size on the crystallization and amorphous phase formation of Ar.
  • To determine the stability of amorphous Ar structures within nano-confined environments.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model liquid argon confined in nanopores of varying diameters.

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  • Simulations involved controlled cooling rates to observe crystallization and amorphous phase transitions.
  • Analysis focused on structural configurations, including local icosahedral ordering, to characterize the Ar phases.

    • Main Results:

    • In larger pores (D>15sigma), Ar crystallization occurred similarly to bulk Ar, with a critical cooling rate (Qc) unaffected by spatial confinement.
    • In smaller pores (D=10sigma), Ar failed to crystallize even at cooling rates significantly lower than bulk Qc, forming an amorphous phase.
    • The amorphous Ar phase, characterized by icosahedral configurations, was found to be the most stable within the 10sigma pore, resisting crystallization even when bulk Ar crystallized.

    Conclusions:

    • Spatial confinement in nanopores dramatically alters the freezing behavior of argon, favoring amorphous phase formation.
    • The findings demonstrate that nano-molds can be effectively used to selectively prepare stable amorphous structures, even for materials typically resistant to glass formation.
    • This research opens possibilities for designing and fabricating novel amorphous materials using nano-confinement strategies.