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Self-Diffusion in Simple Liquids as a Random Walk Process.

Sergey A Khrapak1

  • 1Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia.

Molecules (Basel, Switzerland)
|December 24, 2021
PubMed
Summary
This summary is machine-generated.

Self-diffusion in dense liquids is a random walk process, not hopping. Characteristic length and time scales for this diffusion mechanism are identified.

Keywords:
collective motion in liquidsone-component plasmarandom walk processself-diffusion in liquidstransport properties of liquidsviscosity of liquids

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Area of Science:

  • Physics
  • Physical Chemistry

Background:

  • Diffusion in dense liquids is typically modeled using hopping mechanisms.
  • An alternative perspective on liquid-state diffusion is needed.

Purpose of the Study:

  • To demonstrate that self-diffusion in dense liquids can be modeled as a random walk process.
  • To identify the characteristic length and time scales associated with this random walk diffusion.

Main Methods:

  • Conceptualizing self-diffusion as a random walk.
  • Identifying characteristic length and time scales.
  • Applying the random walk model to the one-component plasma system.

Main Results:

  • Self-diffusion in dense liquids is shown to be a random walk process.
  • Characteristic length and time scales for this diffusion were successfully identified.
  • The one-component plasma model serves as a valid illustration of the proposed mechanism.

Conclusions:

  • The random walk model provides a viable alternative to hopping mechanisms for describing self-diffusion in dense liquids.
  • Understanding the characteristic scales offers new insights into liquid dynamics.
  • This approach is applicable to various dense liquid systems.