Dispersion and the method of dynamic light scattering: a big step in medicine and forensics

Eh ... and if I were to explain the enormous significance of such a phenomenon as dispersion and the resulting methods of analyzing the accompanying processes in the environment ... in simple language, such as, for example, the method of dynamic light scattering.

But then we entered into the search engines requests for practical application and the search engine, as you already understood, did not give much.

About the DLS method - we need it in order to use the laser to measure the sizes of micro and nanoparticles.

“Why should we measure them?” - You ask ...

I will try to answer your question in the simplest way: we measure not just particles but also their state in the composition of a certain substance under a certain exposure.

This is what we need for this: suppose we want to diagnose an emotional state or the presence or absence of a mental disorder in a person.

I would like to note right away that this is not only a contribution to the development of medicine, but also a whole breakthrough in forensics.

Summarizing the MEPhI study , conducted jointly with foreign colleagues, the biomechanics of hand movements during writing and drawing were studied and a unique method was developed for assessing the individual properties of writing speed and pencil pressure.

Actually, returning to nano and microparticles, their condition is analyzed as part of ink or a pencil neck, taking into account the speed of writing, the degree of pressure on the pen or pencil, as well as the direct contours of the text or image.

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Going into a little detail: The

researchers used the dynamic light scattering method.

Passing through dense opaque matter, such as biological tissue or paper, laser radiation scatters their internal structural elements and decays into thin composite light rays.

The scattered parts interfere, resulting in the formation of zones of positive and negative interference, called laser speckles.

If there is any movement in the medium, a tremor is observed in the pattern of interference speckles. The analysis of speckle tremors allows a quantitative assessment of the structural properties of a light-scattering medium.

It is expected that the method can also be used to establish the effects of psychotropic substances on people.

According to scientists, the method can be very effective in the non-contact diagnosis of a wide range of nervous and mental conditions, such as autism, Alzheimer's and Parkinson’s disease, epilepsy and schizophrenia.

In particular, the method may be useful when working with children; An analysis of how the child draws or writes can reveal the progression of the disease or the effectiveness of the chosen treatment or rehabilitation plan.