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Related Concept Videos

The Van der Waals Equation01:26

The Van der Waals Equation

The ideal gas law is based on two simplifying assumptions: first, that there are no intermolecular attractions between gas molecules, and second, that the volume occupied by the molecules themselves is negligible compared with the volume of the container. However, these assumptions don't hold up under all conditions - specifically, at high pressures and low temperatures, as gas tends to deviate from ideal gas behavior.The van der Waals equation is an enhanced version of the ideal gas law,...
Van der Waals Equation01:10

Van der Waals Equation

The ideal gas law is an approximation that works well at high temperatures and low pressures. The van der Waals equation of state (named after the Dutch physicist Johannes van der Waals, 1837−1923) improves it by considering two factors.
First, the attractive forces between molecules, which are stronger at higher densities and reduce the pressure, are considered by adding to the pressure a term equal to the square of the molar density multiplied by a positive coefficient a. Second, the volume...
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.
Van der Waals Interactions01:24

Van der Waals Interactions

Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
Thermodynamic Properties of Ideal Solutions01:19

Thermodynamic Properties of Ideal Solutions

For an ideal liquid solution, the standard state of each component is defined as the pure liquid at the temperature and pressure of the solution. Similarly, for solid solutions, the standard state is the pure solid. The chemical potentials of the components in the ideal solution are compared to the chemical potentials of the pure substances in their standard states. These standard states provide a reference point for calculating the thermodynamic properties of ideal solutions.For ideal...
Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

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Related Experiment Video

Updated: May 10, 2026

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Efficient optimization of van der Waals parameters from bulk properties.

Steven K Burger1, G Andrés Cisneros

  • 1Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan, 48202.

Journal of Computational Chemistry
|July 6, 2013
PubMed
Summary

This study introduces an efficient method to optimize van der Waals (vdW) parameters for force fields, significantly improving accuracy for molecular simulations. The novel approach reduces computational cost and enhances predictions of material properties.

Keywords:
AMBERbulk propertiesforce field parametersoptimizationvan der Waals

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Area of Science:

  • Computational Chemistry
  • Molecular Modeling
  • Physical Chemistry

Background:

  • Developing accurate force fields is crucial for molecular simulations but computationally expensive.
  • Optimizing van der Waals (vdW) terms is often bypassed due to high computational costs.
  • Existing methods rely on general force fields, limiting precision for new compounds.

Purpose of the Study:

  • To develop an efficient and accurate method for optimizing van der Waals (vdW) parameters in molecular force fields.
  • To reduce the computational burden associated with force field parameterization.
  • To improve the predictive accuracy of molecular simulations for various chemical and physical properties.

Main Methods:

  • A novel approach combining ab initio dimer energies and condensed phase properties for vdW term optimization.
  • Utilizing an extrapolation method for parameter derivatives, avoiding exhaustive parameter space searches.
  • Employing an active-space optimization method with quadratic convergence.
  • Applicable to both polarizable and nonpolarizable force fields, with a focus on the AMBER force field.

Main Results:

  • Significantly reduced root mean squared error (RMSE) for density (0.061 to 0.004 g/cm³) and heat of vaporization (1.13 to 0.05 kcal/mol) after only four molecular dynamics iterations.
  • Improved RMSE for self-diffusion (Dself) from 1.22×10⁻⁹ to 0.78×10⁻⁹ m²/s.
  • Reduced RMSE for hydration free energies (ΔGsolv) from 0.30 to 0.26 kcal/mol.
  • Investigated the impact of electrostatic potential (ESP) scaling on simulation accuracy.

Conclusions:

  • The developed method efficiently optimizes vdW parameters, leading to substantial improvements in force field accuracy.
  • The approach offers a computationally feasible alternative for parameterizing new compounds.
  • Optimized vdW parameters enhance the prediction of condensed phase properties and transport phenomena.