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Adhesion

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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Dynamics of nanoparticle adhesion.

Jan-Michael Y Carrillo¹, Andrey V Dobrynin

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

The Journal of Chemical Physics

|December 13, 2012

Summary

This summary is machine-generated.

We studied nanoparticle detachment from surfaces using simulations and theory. We found activation energy decreases with force, transitioning to a power law near detachment, and identified key factors influencing this process.

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Area of Science:

Materials Science
Nanotechnology
Computational Physics

Background:

Understanding nanoparticle detachment is crucial for designing advanced materials and devices.
Existing models often simplify the complex interplay of forces and energies involved in adhesion and de-adhesion.

Purpose of the Study:

To develop a theoretical model for nanoparticle detachment from adhesive substrates.
To investigate the influence of applied force on the activation energy barrier for detachment.
To identify the key physical parameters governing nanoparticle detachment dynamics.

Main Methods:

Molecular dynamics simulations were employed to model the nanoparticle detachment process.
A theoretical model based on Kramers' solution for stochastic barrier crossing was developed.
Weighted histogram analysis method (WHAM) was used to determine effective potentials.

Main Results:

The activation energy for detachment exhibits two regimes: linear decrease with force and a power-law dependence near critical detachment force.
Nanoparticle detachment proceeds via neck formation, with activation energy balanced by surface and elastic energies.
A universal scaling function was identified for zero-applied-force activation energy, dependent on nanoparticle radius, shear modulus, surface energy, and work of adhesion.
The Kramers' approach breaks down near the critical detachment force where detachment becomes deterministic.

Conclusions:

The study provides a comprehensive model for nanoparticle detachment, integrating theoretical and simulation approaches.
The findings offer insights into controlling nanoparticle adhesion and release mechanisms.
The identified scaling laws and parameters are valuable for predicting and optimizing nanoparticle behavior in various applications.