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How are Heterogeneous Nucleation Rate Observations Influenced by Instrument Resolution?

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Instrument resolution significantly affects measured nucleation rates. This study shows how to correct for resolution limits to find intrinsic nucleation parameters, crucial for understanding material formation.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Heterogeneous nucleation rate measurements are vital for understanding material formation processes.
  • Small nuclei (few nanometers) are often below the detection limit of experimental techniques.
  • Finite instrument resolution complicates capturing early-stage nucleation and density evolution.

Purpose of the Study:

  • To demonstrate the impact of instrument resolution on observed nucleation densities.
  • To compare numerical modeling results with experimental data for nucleation rates.
  • To evaluate the influence of resolution on classical nucleation theory (CNT) parameters.

Main Methods:

  • Implemented heterogeneous nucleation in a pore-scale reactive transport model.
  • Utilized classical nucleation theory (CNT) for modeling.
  • Applied artificial resolution limits (15-500 nm) to simulated nuclei counts.
  • Compared modeling results with X-ray nanotomography (XnT) experimental data.

Main Results:

  • Instrument resolution significantly impacts apparent prefactor and interfacial energy values in CNT.
  • Both apparent prefactor and interfacial energy decrease as instrument resolution decreases.
  • Unexpected deviations in interfacial energy were observed due to resolution limits.

Conclusions:

  • The study provides a method to correct nucleation rates affected by instrument resolution.
  • This approach enables the derivation of intrinsic CNT parameters for prefactor and interfacial energy.
  • Understanding resolution effects is critical for accurate nucleation studies.