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Related Concept Videos

Adhesion01:14

Adhesion

Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow glass...

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

Jan-Michael Y Carrillo1, Elie Raphael, Andrey V Dobrynin

  • 1Polymer Program, Institute of Materials Science, and Department of Physics, University of Connecticut, Storrs, Connecticut 06268, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 7, 2010
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Summary

We developed a new nanoparticle adhesion model considering surface energy changes. This model accurately predicts nanoparticle deformation, especially for weakly cross-linked particles, deviating from classical theories.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Nanoparticle adhesion is crucial in various applications.
  • Classical models like Johnson, Kendall, and Roberts (JKR) often simplify nanoparticle behavior.
  • The role of surface energy in nanoparticle deformation needs further investigation.

Purpose of the Study:

  • To develop a novel model for nanoparticle adhesion that incorporates dynamic changes in nanoparticle surface energy.
  • To investigate the influence of nanoparticle cross-linking and interfacial energy on deformation during adhesion.
  • To establish a universal scaling relationship for nanoparticle deformation.

Main Methods:

  • Molecular dynamics simulations were employed to model nanoparticle-surface interactions.
  • Theoretical calculations were performed to derive the governing equations for deformation.
  • A dimensionless parameter (beta) was introduced to characterize deformation regimes.

Main Results:

  • Nanoparticle deformation is dependent on the dimensionless parameter beta = gamma(p)(GR(p))(-2/3)W(-1/3).
  • Classical JKR theory applies to strongly cross-linked nanoparticles (beta < 0.1).
  • Weakly cross-linked nanoparticles exhibit significant deviations from JKR theory due to the critical role of interfacial energy.

Conclusions:

  • The developed model accurately predicts nanoparticle deformation, aligning well with simulation results.
  • A new universal scaling law for nanoparticle deformation has been established.
  • The study highlights the importance of interfacial energy in controlling the adhesion behavior of weakly cross-linked nanoparticles.