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What is powder characterization?

2023-07-17WIKI

Powder characterization is the term that covers the measurement of powder characteristics using various techniques or apparatuses. Powders are composed of solid particles, which can be defined through various parameters, including particle size and shape.

 

However, the powder characteristics are not simply defined by the attributes of the characteristics of particles because there are not only individual particles to be concerned with, but also noting that powders also contain air between the particles, and those particles may also contain pores that contribute to the powder characteristics, including flowability, compressibility, and density.

 

Powder characterization is significant in many industries, of which the most important and relevant are the manufacturing of pharmaceuticals, additive materials, and paints since the performance of their final products is greatly impacted by the particle properties.

 

 

 

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How are particles dispersed when using the wet method?

In laser diffraction particle size analysis, inaccurate results can be caused by particles agglomerating in the suspension, especially when they are fine. Therefore, a full dispersion of the sample prior to measurement is essential.

How are particles dispersed when using the dry method?

Samples that either dissolve or agglomerate in a wet medium or react with the medium are usually analyzed using the dry dispersion method.

What is obscuration?

Obscuration refers to the proportion of light scattered and absorbed by the particles in the measurement zone, which indicates the concentration of the suspension.

What is the background signal?

A background measurement has to be made prior to sample analysis. The background measurement is made up of both optical and electrical signals.

What are refractive index and absorption coefficient?

The refractive index describes the degree to which light rays are bent as they pass from one medium to another. The absorption coefficient is a measure of the light beam penetration through a material.

What are the factors that affect background?

The reasons for abnormal background signals vary. The exclusion of abnormal background signals should begin with inspecting the sample cell, then the laser source and lens, and finally, the alignment system.

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