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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

Published on: July 19, 2016

Polymer and spherical nanoparticle diffusion in nanocomposites.

Argyrios Karatrantos¹, Russell J Composto², Karen I Winey²

¹Department of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, United Kingdom.

The Journal of Chemical Physics

|June 3, 2017

Summary

This summary is machine-generated.

Polymer dynamics in nanocomposites slow with increased nanoparticle loading. Small nanoparticles diffuse faster than expected, but larger ones and higher loadings impede nanoparticle movement.

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

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Area of Science:

Materials Science
Polymer Science
Computational Chemistry

Background:

Nanocomposites offer enhanced properties through nanoparticle incorporation.
Understanding nanoparticle and polymer dynamics is crucial for material design.
Existing models may not fully capture behavior in concentrated systems.

Purpose of the Study:

Investigate polymer and nanoparticle dynamics in spherical nanoparticle-polymer nanocomposites.
Analyze the impact of nanoparticle loading and size on diffusion.
Compare simulation results with established theoretical relations like Stokes-Einstein.

Main Methods:

Utilized molecular dynamics (MD) simulations.
Focused on systems with varying spherical nanoparticle concentrations.
Examined polymer chain and nanoparticle self-diffusion coefficients.

Main Results:

Polymer diffusivity decreases with increasing nanoparticle loading due to enhanced interfacial area.
Small nanoparticles exhibit faster diffusion than predicted by Stokes-Einstein in dilute regimes.
Nanoparticle diffusivity declines at higher loadings due to nanoparticle-polymer interactions.
Increased nanoparticle radius significantly reduces nanoparticle diffusion rates.

Conclusions:

Nanoparticle loading and size critically influence polymer and nanoparticle mobility.
The interfacial region plays a key role in dictating transport properties.
Molecular dynamics provides insights into deviations from continuum theories for nanoparticle diffusion.