A professor from RUDN University developed new liquid crystals
Liquid crystals are an intermediate phase between a liquid and a solid body. They are ordered like regular chrystals but at the same time have a flow like liquids. It is this duality that allows them to be used in organic LEDs and LCDs. Unlike other liquid crystals, discotic ones (DLC) are capable of self-assembly into ordered structures. This makes them a promising material for industrial electronics, namely, for the production of displays. A professor from RUDN University together with his Indian colleagues synthesized and described new dibenzophenazine-based DLCs.
“Discotic liquid crystals are interesting because of their ability to form self-assembled ordered columnar structures. In such structures, an electric charge can move along the column, which makes them useful for optoelectronic devices such as organic LEDs, organic field-effect transistors (OFET), photoelectric solar elements, and sensors,” said Prof. Viktor Belyaev, a Ph.D. in Technical Sciences from the Department of Mechanics and Mechatronics at RUDN University.
The experiments showed that alkoxy thiol chains increased the polarity of the molecules in liquid crystals thus improving the internal structure of the columns and making them more even. All new DLCs were able to withstand temperatures up to 330?. However, the crystals that consisted of smaller molecules (i.e. the ones with their aromatic center surrounded by alkyl thiols) lost their intermediary status and transitioned from the liquid crystal to the liquid form at lower temperatures (55.1 ?) that the crystals from the other two groups. This is due to the size of the molecules in the columns: the bigger they are, the more stable is the liquid crystal state.
“The new discotic liquid crystals could play an important role in organic optoelectronic devices and solar panels,” added Prof. Viktor Belyaev from RUDN University.
The results of the study were published in the Journal of Molecular Liquids.
Bacteria in biofilms are 1,000 times more resistant to antibiotics, disinfectants, mechanical treatment, and other types of stress. A chemist from RUDN University suggested a method to prevent the formation of biofilms and reduce the resistance of bacteria to antimicrobial medications. This might help increase the efficiency of antibacterial treatment in the food industry, medicine, and agriculture.
A specialist in spacecraft movement control analyzed the process of placing vehicle stages, boosters, and other space debris into the so-called disposal orbit and suggested cleaning lower orbits up with a spacecraft that has modules with engine units on board. These modules will attach to space debris objects and move them away. As for the geostationary orbit, a preferable way to clean it up would be a towing spacecraft that transports space debris objects into the disposal orbit.
A biologist from RUDN University studied the development of the immune response in prepubertal male and female animals. According to her, the severity and mortality of infectious and inflammatory diseases at this age depend not on the sex hormones, but mainly on the chromosome set or karyotype.