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What are true and skeletal densities of a powder and how to measure them?

2023-07-18WIKI

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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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