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

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Estimation of particle size distribution parameters with forward-scattering techniques.

H S Shah, R V Mehta, R V Desai

|March 11, 2010

Summary

This study presents a new method for determining the modal size parameter (X(m)) of polydisperse samples using forward-direction polarization measurements. This technique complements existing methods for particle size analysis.

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Area of Science:

Materials Science
Optics
Statistical Mechanics

Background:

Polydisperse samples are often characterized by log-normal distributions.
Two key parameters are geometrical standard deviation (sigma(g)) and modal size parameter (X(m)).
Previous work established a method for determining sigma(g) via angular shifts in I(theta)^2 vs theta plots.

Purpose of the Study:

To introduce a novel method for determining the modal size parameter (X(m)) of polydisperse samples.
To utilize forward-direction polarization measurements for particle size analysis.
To provide a complementary technique for comprehensive characterization of particle size distributions.

Main Methods:

Employing polarization measurements in the forward scattering direction.
Analyzing the angular position of maxima in the degree of polarization (P) vs theta plot.
Comparing the polarization maxima of polydisperse samples with those of single particles.

Main Results:

A method to determine the modal size parameter (X(m)) from polarization data was successfully developed.
The angular position of maxima in P vs theta curves provides a means to extract X(m).
Experimental validation of the proposed method was discussed.

Conclusions:

The described polarization-based method effectively determines the modal size parameter (X(m)) of polydisperse samples.
This technique offers a valuable tool for routine particle size analysis.
The study contributes to the advancement of methods for characterizing particle size distributions.