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Related Concept Videos

Liquid–Solid Solutions01:29

Liquid–Solid Solutions

The process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Solid–Solid Solutions

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Nonideal Two-Component Liquid Solutions01:29

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Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

Liquid-solid coexistence via the metadynamics approach.

Santi Prestipino1, Paolo V Giaquinta

  • 1Dipartimento di Fisica, Università degli Studi di Messina, Contrada Papardo, Messina, Italy. santi.prestipino@unime.it

The Journal of Chemical Physics
|March 26, 2008
PubMed
Summary
This summary is machine-generated.

Metadynamics efficiently maps free-energy landscapes, revealing insights into generalized thermodynamic potentials during phase transitions. This study examines its application and limitations in modeling the 2D freezing of Lennard-Jones fluids.

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Last Updated: Jul 6, 2026

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

Area of Science:

  • Computational Physics
  • Chemical Physics
  • Thermodynamics

Background:

  • Free-energy landscape calculations are crucial for understanding molecular processes.
  • The metadynamics method offers a novel approach to exploring these landscapes.
  • Discontinuous phase transitions present unique challenges for thermodynamic analysis.

Purpose of the Study:

  • To illustrate the properties of generalized thermodynamic potentials using metadynamics.
  • To assess the capabilities and constraints of the metadynamics method.
  • To investigate the 2D freezing of a Lennard-Jones fluid as a model system.

Main Methods:

  • Application of the metadynamics method.
  • Analysis of generalized thermodynamic potentials.
  • Simulation of a two-dimensional Lennard-Jones fluid undergoing freezing.

Main Results:

  • Metadynamics successfully mapped the free-energy landscape relevant to the phase transition.
  • The study identified specific virtues and limitations of the metadynamics approach in this context.
  • Observed behaviors are consistent with theoretical expectations for 2D freezing.

Conclusions:

  • Metadynamics is a valuable tool for studying phase transitions and thermodynamic potentials.
  • Understanding the method's limitations is essential for accurate interpretation of results.
  • The 2D freezing of Lennard-Jones fluids serves as a useful benchmark for metadynamics validation.