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Consider a binary electrolyte AB with a concentration ‘c’ that reversibly dissociates into its constituent ions. The degree of this dissociation is represented by ⍺. This means that the equilibrium concentration of each ionic species can be expressed as ⍺c. As well as this, the fraction of the electrolyte that remains undissociated at equilibrium is given by (1−⍺). The corresponding equilibrium concentration for this undissociated portion is then calculated...
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Ostwald ripening in multiple-bubble nuclei.

Hiroshi Watanabe1, Masaru Suzuki2, Hajime Inaoka3

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This study used molecular dynamics simulations to investigate bubble coarsening. Results confirm Lifshitz-Slyozov-Wagner theory predictions and reveal temperature-dependent growth mechanisms for Ostwald ripening.

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Area of Science:

  • Physics
  • Materials Science
  • Chemical Engineering

Background:

  • Ostwald ripening is a key process in phase transitions, affecting material properties.
  • Understanding bubble coarsening dynamics is crucial for various industrial applications.

Purpose of the Study:

  • To investigate Ostwald ripening of bubbles using large-scale molecular dynamics simulations.
  • To validate theoretical predictions of bubble-size distribution and growth kinetics.

Main Methods:

  • Employed molecular dynamics (MD) simulations with up to 679 million Lennard-Jones particles.
  • Simulated bubble formation and coarsening in a pure-liquid phase after system depressurization.

Main Results:

  • Directly confirmed the self-similarity of the bubble-size distribution function as predicted by Lifshitz-Slyozov-Wagner theory.
  • Observed the total number of bubbles decreasing asymptotically as t(-x), with a temperature-dependent scaling exponent x.
  • Demonstrated a transition in bubble growth from interface-limited (t(1/2)) to diffusion-limited (t(1/3)) as temperature increases.

Conclusions:

  • The study validates theoretical models for Ostwald ripening.
  • Bubble growth dynamics are sensitive to temperature, shifting between interface-limited and diffusion-limited regimes.
  • Molecular dynamics simulations provide a powerful tool for studying complex phase transition phenomena.