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Related Concept Videos

Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Typical Model Studies

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Fluid mechanics model studies often utilize scaled-down systems to predict fluid behavior in full-scale environments, such as river flows, dam spillways, and structures interacting with open surfaces. Maintaining Froude number similarity in river models is crucial, as it replicates surface flow features like wave patterns and velocities.
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Van der Waals Interactions01:24

Van der Waals Interactions

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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.
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Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
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Related Experiment Video

Updated: Jun 24, 2025

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
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Modeling Water Interactions with Graphene and Graphite via Force Fields Consistent with Experimental Contact Angles.

Shane R Carlson1, Otto Schullian1,2, Maximilian R Becker1

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|June 10, 2024
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Summary

Optimized force fields for water-graphene and water-graphite interactions improve nanofluidic simulations. New methods accurately calculate contact angles, aligning simulations with experimental data for these critical materials.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Nanotechnology

Background:

  • Accurate simulation models for water-graphene and graphite interactions are crucial for nanofluidic applications.
  • Existing force fields exhibit significant discrepancies in predicted water contact angles.

Purpose of the Study:

  • To optimize classical force fields for water-graphene and graphite interactions.
  • To develop a reliable method for calculating contact angles in simulations.

Main Methods:

  • Extensive review of experimental literature for graphene-water and graphite-water contact angles.
  • Optimization of carbon-oxygen dispersion energy for classical force fields.
  • Derivation of interaction force fields for finite cutoffs.
  • Introduction of a pressure tensor method for contact angle calculation.

Main Results:

  • Optimized force field yields a 80° contact angle for unsupported graphene, matching experimental means.
  • Graphite-water contact angles cluster into freshly exfoliated (60° ± 13°) and non-freshly exfoliated groups.
  • Developed a contact angle calculation method suitable for planar equilibrium simulations.

Conclusions:

  • The optimized force field provides accurate simulations of water interactions with graphene and graphite.
  • The new methodology enhances the reliability of nanofluidic simulations.
  • The approach is broadly applicable to various liquid-surface interactions.