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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

Published on: May 20, 2014

Network confinement and heterogeneity slows nanoparticle diffusion in polymer gels.

Emmabeth Parrish¹, Matthew A Caporizzo¹, Russell J Composto¹

¹Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6272, USA.

The Journal of Chemical Physics

|June 3, 2017

Summary

Nanoparticle diffusion in polyacrylamide gels (PAGs) is hindered by increased confinement and gel collapse. Understanding these effects is key for designing advanced materials for drug delivery and separation technologies.

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Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Nanoparticle (NP) diffusion is crucial for applications like drug delivery and separation membranes.
Polyacrylamide gels (PAGs) offer tunable structures for controlling NP mobility.
Understanding NP-gel interactions is essential for optimizing material performance.

Purpose of the Study:

To investigate the impact of gel confinement and structure on nanoparticle diffusion.
To quantify nanoparticle mobility using confinement ratio (CR) and gel properties.
To explore the relationship between gel heterogeneity and NP diffusion behavior.

Main Methods:

Single particle tracking to measure nanoparticle movement in PAGs.
Varying crosslinker density and acetone concentration to alter PAG mesh size and induce collapse.
Analysis of mean squared displacements (MSDs) and van Hove distributions to characterize diffusion.

Main Results:

Increased confinement ratio (CR) and gel collapse significantly reduced NP diffusion.
Non-Gaussian displacements and increased non-Gaussian parameter indicated intermittent NP localization and gel heterogeneity.
Diffusion coefficients decreased exponentially with CR in crosslinked gels and more sharply in collapsed gels.

Conclusions:

Gel structure, including mesh size and heterogeneity, profoundly influences nanoparticle mobility.
Acetone-induced gel collapse creates more tortuous pathways, further impeding NP diffusion.
Findings provide insights for designing PAGs with tailored properties for specific applications in drug delivery and separation.