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Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Updated: Dec 14, 2025

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

Local Confinement Controls Diffusive Nanoparticle Dynamics in Semidilute Polyelectrolyte Solutions.

Ali H Slim¹, Ryan Poling-Skutvik², Jacinta C Conrad¹

¹Department of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|July 18, 2020

Summary

This summary is machine-generated.

We studied polystyrene particle movement in sodium polystyrene sulfonate (NaPSS) solutions. Particle mobility deviates from predictions at low ionic strength due to confinement effects, unlike at high ionic strength where Stokes-Einstein dynamics apply.

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Area of Science:

Polymer physics
Soft matter science
Nanoparticle dynamics

Background:

Understanding nanoparticle mobility in polymer solutions is crucial for applications in drug delivery and materials science.
Sodium polystyrene sulfonate (NaPSS) solutions exhibit complex behavior influenced by ionic strength and polymer conformation.

Purpose of the Study:

To investigate the effect of ionic strength on the dynamics of polystyrene nanoparticles in NaPSS solutions.
To explore deviations from predicted behavior and identify underlying mechanisms.

Main Methods:

Fluorescence microscopy was used to track the movement of polystyrene nanoparticles (100-790 nm).
Ionic strength was varied to tune polymer conformations in dilute and semidilute NaPSS solutions.

Main Results:

Nanoparticle mean-squared displacements showed Fickian diffusive dynamics across all time scales.
At high ionic strength, particle dynamics followed the Stokes-Einstein prediction, coupling to bulk viscosity.
At low ionic strength, particle dynamics deviated nonmonotonically from bulk predictions with increasing polymer concentration, correlating with non-Gaussian displacement distributions.

Conclusions:

Polyelectrolyte solutions can exhibit complex nanoparticle dynamics not captured by simple models.
A local confining length scale emerges at low ionic strength with increasing polyelectrolyte concentration, influencing particle mobility.