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Pore Size Distribution

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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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Related Experiment Video

Updated: Jun 23, 2026

Dynamic Light Scattering Analysis for the Determination of the Particle Size of Iron-Carbohydrate Complexes

Dynamic Light Scattering Analysis for the Determination of the Particle Size of Iron-Carbohydrate Complexes

Published on: July 7, 2023

Vesicle sizing: Number distributions by dynamic light scattering.

F R Hallett¹, J Watton, P Krygsman

¹Guelph-Waterloo Program for Graduate Work in Physics, Department of Physics, University of Guelph, Guelph, Ontario N1G 2W1.

Biophysical Journal

|May 12, 2009

Summary

This study optimizes dynamic light scattering (DLS) analysis for liposome systems. The method accurately determines vesicle size distributions, aligning with electron microscopy (EM) findings.

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Last Updated: Jun 23, 2026

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Area of Science:

Materials Science
Biophysics
Analytical Chemistry

Background:

Dynamic Light Scattering (DLS) is a powerful technique for characterizing nanoparticle size.
Analyzing DLS data from complex systems like liposomes can be challenging.
Accurate size distribution is crucial for understanding vesicle behavior and applications.

Purpose of the Study:

To develop and optimize fitting methods for DLS data analysis of vesicle/liposome systems.
To enable direct comparison of DLS-derived size distributions with electron microscopy (EM) data.
To improve the accuracy and reliability of DLS for liposome characterization.

Main Methods:

Optimization of nonnegative least squares and exponential sampling fitting algorithms.
Application of a Rayleigh-Gans-Debye form factor for coated spheres.
Analysis of DLS data from aqueous vesicle/liposome suspensions.
Comparison with freeze-fracture electron microscopy (EM) for validation.

Main Results:

The optimized procedure successfully analyzes DLS data from liposome suspensions.
Number distributions derived from DLS show excellent agreement with EM results.
Accurate vesicle size distributions were obtained in the 100-200 nm range.

Conclusions:

The described DLS analysis procedure provides reliable and comparable size distribution data for liposomes.
This method enhances the utility of DLS for studying vesicle systems.
The findings validate the optimized DLS approach against a gold standard technique (EM).