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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 20, 2014

Intrinsic fluid interfaces and nonlocality.

Eva M Fernández1, Enrique Chacón, Pedro Tarazona

  • 1Instituto de Ciencia de Materiales de Madrid, CSIC, 28049 Madrid, Spain and Departamento de Física Fundamental, Universidad Nacional de Educación Distancia, Madrid 28040, Spain.

Physical Review Letters
|September 17, 2013
PubMed
Summary
This summary is machine-generated.

Extensive molecular dynamics simulations reveal liquid-gas interface fluctuations are not rigid translations. Instead, density profiles exhibit wave-vector dependent behavior, aligning with nonlocal interfacial Hamiltonian theory.

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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
11:03

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Published on: December 4, 2017

Area of Science:

  • Thermodynamics
  • Statistical Mechanics
  • Computational Physics

Background:

  • Understanding liquid-gas interfaces is crucial in physical chemistry.
  • Previous models often assumed rigid translations for interface fluctuations.

Purpose of the Study:

  • To investigate the structure and fluctuations of a liquid-gas interface using molecular dynamics.
  • To analyze the correlation between interfacial shape and intrinsic density profiles.

Main Methods:

  • Extensive molecular dynamics simulations with cutoff Lennard-Jones interactions.
  • Intrinsic sampling method to extract equilibrium and constrained intrinsic density profiles.
  • Analysis of interfacial shape fluctuations.

Main Results:

  • Equilibrium and intrinsic density profiles were successfully extracted.
  • Demonstrated that density fluctuations are not rigid translations of an underlying profile.
  • Observed wave-vector dependent behavior across a wide range of wavelengths.

Conclusions:

  • The study challenges the common assumption of rigid translations in interface dynamics.
  • Results support nonlocal interfacial Hamiltonian theory for describing density profile shape dependence.
  • Provides a detailed molecular-level understanding of liquid-gas interface behavior near the triple point.