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Related Concept Videos

Characteristics of Fluids01:20

Characteristics of Fluids

When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
Characteristics of Fluids01:31

Characteristics of Fluids

Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation04:01

Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation

Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws.
Newtonian Fluid: Problem Solving01:18

Newtonian Fluid: Problem Solving

Newtonian fluids exhibit a constant viscosity, meaning their shear stress and shear strain rate are directly proportional. This property ensures a predictable and stable response to applied forces, maintaining a linear relationship between force and flow. Examples include water, air, and light oils, consistently demonstrating this proportional behavior regardless of external conditions.
A velocity gradient forms within the fluid when a Newtonian fluid is placed between two parallel plates, with...

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Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Hard sphere fluids at a soft repulsive wall: a comparative study using Monte Carlo and density functional methods.

Debabrata Deb1, Alexander Winkler, Mohammad Hossein Yamani

  • 1Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudinger Weg 7, 55099 Mainz, Germany.

The Journal of Chemical Physics
|June 14, 2011
PubMed
Summary
This summary is machine-generated.

This study simulates hard-sphere fluids in confined spaces, revealing how wall interactions influence packing and crystallization. Density functional theory accurately predicts fluid behavior, aiding in understanding colloidal dispersions.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Confined fluids exhibit unique properties compared to bulk systems.
  • Understanding phase transitions like crystallization in confined geometries is crucial for materials science.
  • Wall-fluid interactions significantly impact the behavior of confined systems.

Purpose of the Study:

  • To investigate the behavior of hard-sphere fluids confined between parallel plates.
  • To explore the effects of varying wall-fluid interaction strength on packing fraction and surface free energies.
  • To compare the accuracy and efficiency of Monte Carlo (MC) simulations and density functional theory (DFT) in predicting fluid and crystal properties.

Main Methods:

  • Monte Carlo (MC) simulations were employed to model hard-sphere fluids.
  • Density Functional Theory (DFT) using fundamental measure functionals was applied.
  • Various methods for extracting surface free energies (wall-fluid γ(wf) and wall-crystal γ(wc)) from MC simulations were implemented and compared.

Main Results:

  • The study analyzed a wide range of packing fractions, including the onset of crystallization.
  • Varying the wall interaction strength (ε) affected surface excess packing fraction and surface free energies.
  • DFT demonstrated quantitative accuracy across a broad range of packing fractions, with minor deviations near the fluid-crystal transition.

Conclusions:

  • The findings provide insights into the behavior of hard-sphere fluids under confinement and the influence of soft walls.
  • DFT is a reliable tool for predicting properties of confined hard-sphere systems.
  • Results can aid in interpreting experimental data from colloidal dispersions.