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Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

The Colloidal State

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Related Experiment Video

Updated: May 17, 2026

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Advanced rheological characterization of soft colloidal model systems.

S Gupta¹, S K Kundu, J Stellbrink

¹Jülich Centre for Neutron Science (JCNS-1) and Institute for Complex Systems (ICS-1), Forschungszentrum Jülich, D-52425 Jülich, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|November 2, 2012

Summary

This study explores polymer-based soft colloids using advanced rheology. Findings reveal insights into their complex flow behavior and limitations of current characterization models.

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Last Updated: May 17, 2026

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Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Studying Large Amplitude Oscillatory Shear Response of Soft Materials

Published on: April 25, 2019

Area of Science:

Soft matter physics
Polymer science
Rheology

Background:

Polymer-based soft colloids exhibit complex flow behaviors.
Advanced rheological characterization is needed for these systems.
Existing models may have limitations in describing their behavior.

Purpose of the Study:

Investigate the flow behavior of polymer-based soft colloidal model systems.
Quantify internal relaxation times in dilute and concentrated regimes.
Evaluate the applicability of the SRFS approach for rheological characterization.

Main Methods:

Steady and oscillatory shear rheology.
Investigation of high molecular weight polybutadiene star polymers.
Non-linear rheology of star-like block copolymer micelles.

Main Results:

Internal Zimm time (τ(z)) quantified in dilute regime, dependent on matrix viscosity due to polymer shrinkage.
Master curve generated for concentrated regime, independent of colloidal softness.
Strain-rate independent structural relaxation time (τ(0)) not observed in linear regime.

Conclusions:

Polymer nature significantly influences relaxation times in soft colloids.
The SRFS approach shows limitations, particularly at high frequencies and in the linear regime.
Further refinement of rheological models is necessary for accurate soft colloid characterization.