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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids

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Macroscopic nucleation phenomena in continuum media with long-range interactions.

Masamichi Nishino¹, Cristian Enachescu, Seiji Miyashita

¹Computational Materials Science Center, National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan. nishino.masamichi@nims.go

Scientific Reports

|February 23, 2012

Summary

Nucleation is typically microscopic, but this study reveals it can be macroscopic. Long-range elastic interactions allow critical nucleus size to scale with system size, introducing macroscopic barrier-crossing nucleation.

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Area of Science:

Materials Science
Condensed Matter Physics
Chemical Engineering

Background:

Nucleation is a critical process in phase transformations, vital for atmospheric science and electronics.
Traditionally, nucleation is viewed as a microscopic phenomenon involving the formation of nano-sized nuclei.
The role of long-range interactions in nucleation has been historically underestimated.

Purpose of the Study:

To challenge the traditional microscopic view of nucleation.
To introduce and demonstrate the concept of macroscopic barrier-crossing nucleation.
To investigate the influence of long-range elastic interactions on nucleation processes.

Main Methods:

Utilizing molecular dynamics simulations.
Modeling a spin-crossover system with two distinct molecular states.
Analyzing the effects of elastic distortions caused by molecular size differences.

Main Results:

Demonstrated that nucleation can occur as a macroscopic process.
Showed that the critical nucleus size is proportional to the total system size.
Identified long-range elastic interactions as the key mechanism driving macroscopic nucleation.

Conclusions:

Nucleation is not exclusively a microscopic process.
Macroscopic barrier-crossing nucleation, driven by elastic distortions, offers a new paradigm.
This finding has significant implications for materials science and phase transition studies.