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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...

Polymers: Molecular Weight Distribution

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.

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...

Polymers: Defining Molecular Weight

Polymers: Defining Molecular Weight

Unlike small molecules with definite molecular weights, polymers are a mixture of individual polymer chains of varying lengths, each with a unique molecular weight. So, the molecular weight of a polymer is expressed as an average value based on the average size of the polymer chains. The two most common forms of averages used for polymers are the number average molecular weight and weight average molecular weight.
The number average molecular weight (Mn) is the summation of the number...

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: Jan 7, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Published on: January 9, 2017

Redefining Cumulant Analysis in Dynamic Light Scattering for Multimodal and Highly Polydisperse Colloidal Systems.

Lukas Grabenwarter¹, Christian Moitzi¹, Sandor Balog²

¹Anton Paar GmbH, Anton-Paar-Str 20, Graz 8054, Austria.

The Journal of Physical Chemistry. B

|December 29, 2025

Summary

This summary is machine-generated.

A new cumulant analysis method enhances Dynamic Light Scattering (DLS) for complex colloidal systems. This breakthrough accurately characterizes multimodal and highly polydisperse samples, overcoming previous limitations.

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Last Updated: Jan 7, 2026

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Measurement of Particle Size Distribution in Turbid Solutions by Dynamic Light Scattering Microscopy

Published on: January 9, 2017

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Published on: May 20, 2014

Assembly and Characterization of Polyelectrolyte Complex Micelles

Assembly and Characterization of Polyelectrolyte Complex Micelles

Published on: March 2, 2020

Area of Science:

Colloid and interface science
Materials characterization
Physical chemistry

Background:

Dynamic Light Scattering (DLS) is essential for analyzing colloidal systems.
Cumulant analysis in DLS is simple but limited to monodisperse or modestly polydisperse samples.
Complex autocorrelation functions in polydisperse systems pose challenges for traditional cumulant analysis.

Purpose of the Study:

To develop an innovative cumulant analysis method for DLS.
To overcome the limitations of traditional cumulant analysis for complex samples.
To enable accurate characterization of multimodal and highly polydisperse systems.

Main Methods:

An analytical form with all cumulants embedded was applied, avoiding cumulant truncation.
The method was verified using synthetic data.
Experimental analysis was performed to validate the approach.

Main Results:

The redefined cumulant analysis successfully characterized complex autocorrelation functions.
The method demonstrated capability in analyzing multimodal and highly polydisperse systems.
Validation on synthetic and experimental data confirmed the method's efficacy.

Conclusions:

The enhanced cumulant analysis method expands the utility of DLS for complex colloidal systems.
This approach retains the simplicity of the original method while unlocking its full potential.
The study resolves a long-standing challenge in DLS data analysis, persisting for over 30 years.