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Density functional theory for semiflexible and cyclic polyatomic fluids.

Dapeng Cao1, Jianzhong Wu

  • 1Department of Chemical and Environmental Engineering, University of California, Riverside, California 92521, USA.

The Journal of Chemical Physics
|August 31, 2004
PubMed
Summary
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This study explores how bond angle and chain stiffness affect semiflexible polyatomic fluids using advanced density functional theory. The model accurately predicts fluid structures and conformational properties, offering insights into molecular behavior.

Area of Science:

  • Physical Chemistry
  • Materials Science
  • Statistical Mechanics

Background:

  • Understanding the structure of polyatomic fluids is crucial for predicting their behavior.
  • Semiflexible chains and bond angles significantly influence fluid properties.
  • Existing theories often struggle to accurately model complex molecular structures.

Purpose of the Study:

  • Investigate the impact of bond angle and chain stiffness on polyatomic fluid structures.
  • Develop and validate a refined density functional theory (DFT) for semiflexible chains.
  • Explore conformational properties and adsorption behavior of heterogeneous fluids.

Main Methods:

  • Incorporated bending potential into a modified fundamental measure theory (FMT) and first-order thermodynamics perturbation theory.

Related Experiment Videos

  • Refined DFT to accurately model excluded-volume effects and chain connectivity.
  • Validated the theory against extensive Monte Carlo simulation data for various fluid systems.

    • Main Results:

    • The DFT accurately reproduces density profiles and conformational properties of triatomic fluids near a hard wall.
    • Successfully captured the structures of rigid cyclic trimers.
    • Observed novel double peaks in density profiles for quadratomic fluids in slit pores, absent in flexible models.
    • Predicted conformational properties and adsorption of heterogeneous "ABB" type fluids.

    Conclusions:

    • The refined DFT provides a reliable framework for studying semiflexible polyatomic fluids.
    • Chain stiffness and bond angles are critical factors determining fluid structure and behavior.
    • The theory offers valuable insights into phenomena like surface adsorption and self-association in complex molecular systems.