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.
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