Russian scientists have created a unique method to control the levitating drops

© RIA Novosti / Alina Polynesia scientists have created a unique method to control the levitating dropsRussian scientists have created a unique method to control the levitating drops© RIA Novosti / Alina Polyanina

Physics of Tyumen state University have learned to explore the micro-particles of liquid at the time of levitation, as well as to form the desired size of the clusters from the ordered microdroplets. Work is fundamental to understanding the distribution of contaminants in the environment and prevent further environmental disasters. The article study published in the respected scientific journal The journal of Physical Chemistry Letters.

In 2003, scientists of Tyumen state University have discovered the phenomenon of self-organization of water droplets in the ordered clusters. Drops levitated above the surface due to the ascending air and are stable for up to several minutes. As soon as the drop increases in size due to condensation, it becomes more difficult, the updrafts can no longer hold it, drop falling into water, and the cluster splits. All this happens in milliseconds, and affects hundreds of droplets simultaneously.

TSU scientists have learned to hold drip clusters within a few hours, irradiating them with infrared light. Also, now they know how to work not only with hot liquids (50-60 °C), but with a cooler (27-30 °C), which opens the possibility of studying substances that are associated with the vital activity of organisms.

Explains head of laboratory microhydrodynamics technologies, Tyumen state University, doctor of technical Sciences Alexander Fedorets: «We have created technology that allows you to explore the processes in the droplets in the laboratory. Relatively speaking, we can each of us generated droplet aerosol to assign the room to get her passport and watch her for a long time. Natural aerosols, which, for example, is a common mist, — such an observation is impossible, because you never observe the behavior of individual droplets».

Aerosols referred to are not miscible and do not react with each other chemically (disperse system) of suspended fine particles. In the nature of the aerosols consist of clouds, fog, smoke (svobodnodispersnye aerosols), dust (coarse aerosols) and so on. Aerosols produced by mechanical grinding and pulverization of solids or liquids: the crushing, abrasion, explosions, combustion, atomization in sprays. So scientists so it is important to know the specific chemical and biological processes occurring in microcaps aerosols — this knowledge will give the ability to predict natural phenomena and to minimize environmental pollution.

Droplet aerosols «work» as chemical reactors of microscopic dimensions with unique characteristics. These «reactors» are the most interesting processes: the transformation of one substances into others, dangerous to safe and Vice versa. If you move the microscope to a regular fog, you can see a completely random pattern: randomly drops worn, so it is impossible to estimate what happens in a single drop.

The uniqueness of the technology TSU is that scientists can get almost the same drops as in the natural aerosol, but to fully control their behavior. That is, these drops can be summed up in a field of view of the microscope and studied there. It allows to study natural processes at a whole new level.

The latest achievements of scientists TSU associated with the development of technology of an Assembly of clusters of a predetermined number of droplets. This is a fundamentally new possibilities of process control.

«We have been able to create clusters, but they were going from an arbitrary number of droplets, — as it will, and will, — explains Alexander Fedorets. Now we can assemble clusters of any desired number. These clusters proved to be very interesting. A classic cluster that we studied had a hexagonal structure. Small clusters were much more diverse. And every time they are formed the same way, every drop as if it knows its place. But, of course, this is not magical laws, not media or an imaginary robot that puts these drops in the right structure… Everything happens according to the laws of physics and the geometry of space».

Forms, which takes a cluster, optimal from the point of view of physics space. This ensures the most dense packing and stable structure of the cluster. Therefore, these forms are reproduced automatically.

At the moment, the technology of retention and study of microdroplets with the ability to form the desired clusters exists only in the Tyumen state University.

Tyumen state University — the participant of the state program of support of leading Russian universities «5-100 Project», which was launched by the Ministry of education and science in accordance with the presidential decree «On measures on realization of state policy in education and science» to ensure a qualitative breakthrough to improve the competitiveness of leading Russian universities.

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