Modeling nonequilibrium dynamics of phase transitions at the nanoscale: Application to spin-crossover

Sang Tae Park, Renske M. van der Veen

Research output: Contribution to journalArticle

Abstract

In this article, we present a continuum mechanics based approach for modeling thermally induced single-nanoparticle phase transitions studied in ultrafast electron microscopy. By using coupled differential equations describing heat transfer and the kinetics of the phase transition, we determine the major factors governing the time scales and efficiencies of thermal switching in individual spin-crossover nanoparticles, such as the thermal properties of the (graphite) substrate, the particle thickness, and the interfacial thermal contact conductance between the substrate and the nanoparticle. By comparing the simulated dynamics with the experimental single-particle diffraction time profiles, we demonstrate that the proposed non-equilibrium phase transition model can fully account for the observed switching dynamics.

Original languageEnglish (US)
Article number044028
JournalStructural Dynamics
Volume4
Issue number4
DOIs
StatePublished - Jul 1 2017

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crossovers
Phase transitions
Nanoparticles
nanoparticles
continuum mechanics
Continuum mechanics
Graphite
Substrates
Electron microscopy
electric contacts
electron microscopy
Differential equations
differential equations
Thermodynamic properties
graphite
thermodynamic properties
Diffraction
heat transfer
Heat transfer
Kinetics

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy

Cite this

Modeling nonequilibrium dynamics of phase transitions at the nanoscale : Application to spin-crossover. / Park, Sang Tae; van der Veen, Renske M.

In: Structural Dynamics, Vol. 4, No. 4, 044028, 01.07.2017.

Research output: Contribution to journalArticle

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