Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

28.6K
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...
28.6K
Contact Angle01:13

Contact Angle

27.7K
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...
27.7K
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

3.2K
When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
3.2K
Types of Forces01:09

Types of Forces

12.1K
In most situations, forces can be grouped into two categories: contact forces and field forces.  Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there...
12.1K
Van der Waals Interactions01:24

Van der Waals Interactions

58.1K
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.
58.1K
Intermolecular Forces03:13

Intermolecular Forces

62.9K
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...
62.9K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Enhanced Explosion Characteristics of Methane/Air Induced by Barium Nitrate under a Large Horizontal Pipeline.

ACS omega·2026
Same author

Size Effect of the Length-to-Diameter Ratio of Pipelines on the Methane/Air Explosion Pressure.

ACS omega·2026
Same author

Enhanced Interfacial Wettability and Retardancy of Cellulose Acetate/Ammonium Polyphosphate/Polyvinylidene Fluoride Ternary Composites Fabricated by One-Step Electrospinning.

ACS omega·2025
Same author

Dynamic Behavior of Submerged Cylindrical Shells Under Combined Underwater Explosion, Bubble Pulsation, and Hydrostatic Pressure.

Materials (Basel, Switzerland)·2025
Same author

METTL3-Mediated m6A Modification Regulates the Osteogenic Differentiation through LncRNA CUTALP in Periodontal Mesenchymal Stem Cells of Periodontitis Patients.

Stem cells international·2024
Same author

TIMELESS promotes reprogramming of glucose metabolism in oral squamous cell carcinoma.

Journal of translational medicine·2024

Related Experiment Video

Updated: May 2, 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

10.2K

Interaction forces between a spherical nanoparticle and a flat surface.

Weifu Sun1

  • 1School of Materials Science and Engineering, The University of New South Wales, Sydney, NSW 2052, Australia. weifu.sun518@gmail.com weifu.sun@unsw.edu.au.

Physical Chemistry Chemical Physics : PCCP
|February 20, 2014
PubMed
Summary

The continuum Hamaker model fails at the nanoscale. Molecular dynamic simulations reveal distinct interaction forces between nanoparticles and surfaces, leading to new formulas for van der Waals attraction and Born repulsion.

More Related Videos

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
09:29

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

11.5K
A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
08:09

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

10.4K

Related Experiment Videos

Last Updated: May 2, 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

10.2K
Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
09:29

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

11.5K
A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
08:09

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

10.4K

Area of Science:

  • Surface science
  • Nanotechnology
  • Computational physics

Background:

  • The Derjaguin approximation and continuum Hamaker model are inadequate for describing nanoscale interactions due to atomic discreteness and surface effects.
  • Accurate modeling of nanoparticle-surface interactions is crucial for applications in nanotechnology and materials science.

Purpose of the Study:

  • To investigate the interaction forces (van der Waals attraction, Born repulsion, mechanical contact) between a spherical nanoparticle and a flat substrate at the nanoscale.
  • To compare molecular dynamic (MD) simulation results with the continuum Hamaker model.
  • To develop improved models for nanoscale interactions.

Main Methods:

  • Molecular dynamic (MD) simulations were employed to model the interactions.
  • The simulated forces were compared quantitatively and qualitatively with predictions from the Hamaker approach.
  • Analysis focused on the differences between single nanosphere-flat surface and two interacting nanospheres scenarios.

Main Results:

  • The continuum Hamaker model significantly underestimates interaction forces at the nanoscale.
  • Force ratios for nanosphere-flat surface interactions differ from those for two nanospheres.
  • New, separate formulas were proposed for estimating van der Waals attraction and Born repulsion forces.
  • The Hertz model effectively describes mechanical contact forces between the nanoparticle and the substrate.

Conclusions:

  • The limitations of continuum models necessitate atomistic approaches like MD for accurate nanoscale interaction predictions.
  • The proposed formulas offer improved accuracy for van der Waals and Born repulsion forces in nanosphere-flat surface systems.
  • The Hertz model remains applicable for mechanical contact forces in this regime.