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Related Concept Videos

Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
Intermolecular Forces03:13

Intermolecular Forces

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 bonds, and dispersion...
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,...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...

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Related Experiment Video

Updated: May 30, 2026

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
13:15

Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy

Published on: July 18, 2014

Solvation forces between molecularly rough surfaces.

Kan Yang1, Yangzheng Lin, Xiancai Lu

  • 1State Key Lab for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, 22 Hankou Road, Nanjing 210093, PR China.

Journal of Colloid and Interface Science
|July 22, 2011
PubMed
Summary
This summary is machine-generated.

Surface roughness significantly impacts fluid behavior near surfaces. Our study shows that roughness, quantified by a roughness parameter, effectively dampens solvation pressure oscillations, aligning simulations with experimental observations for heterogeneous surfaces.

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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Surface heterogeneity critically influences wetting and adhesion.
  • Standard models often assume smooth solid-fluid interfaces, leading to unrealistic fluid layering and solvation pressure oscillations.
  • Experimental observations, except for ideal monocrystals, rarely show these oscillations.

Purpose of the Study:

  • To investigate the effect of surface roughness on solvation pressure of Lennard-Jones (LJ) fluids confined by LJ walls.
  • To quantify surface roughness using a roughness parameter in the quenched solid density functional theory (QSDFT).
  • To compare simulation results with experimental data for nitrogen sorption in carbon nanopores.

Main Methods:

  • Utilized quenched solid density functional theory (QSDFT) to model fluid-solid interactions.
  • Quantified surface roughness by a parameter representing the thickness of the surface "corona".
  • Performed calculations for LJ model of nitrogen sorption at 74.4 K in slit-shaped carbon nanopores.

Main Results:

  • Surface roughness with an amplitude comparable to the fluid molecular diameter effectively dampens solvation pressure oscillations.
  • QSDFT accurately models fluid behavior on heterogeneous surfaces, resolving discrepancies with smooth surface assumptions.
  • Simulations provide a basis for comparison with experimental adsorption data.

Conclusions:

  • Surface roughness is crucial for accurately predicting solvation pressure and fluid behavior in confined systems.
  • QSDFT offers a robust framework for studying adsorption on heterogeneous surfaces.
  • Findings enhance understanding of fluid adsorption and have implications for modeling adsorption-induced deformation.