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2. The role of attraction in the phase diagrams and melting scenarios of generalized 2D Lennard-Jones systems

Author

Tsiok, Elena N., Fomin, Yuri D., Gaiduk, Evgenii A., Tareyeva, Elena E., Ryzhov, Valentin N., Libet, Pavel A., Dmitryuk, Nikita A., Kryuchkov, Nikita P., and Yurchenko, Stanislav O.

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Monolayer and two-dimensional (2D) systems exhibit rich phase behavior, compared with 3D systems, in particular, due to the hexatic phase playing a central role in melting scenarios. The attraction range is known to affect critical gas-liquid behavior (liquid-liquid in protein and colloidal systems), but the effect of attraction on melting in 2D systems remains unstudied systematically. Here, we reveal how the attraction range affects the phase diagrams and melting scenarios in a 2D system. Using molecular dynamics simulations we considered the generalized Lennard-Jones system with a fixed repulsion branch and different power indices of attraction, from long-range dipolar to short-range sticky-spheres-like. A drop in the attraction range has been found to reduce the temperature of the gas-liquid critical point, bringing it closer to the gas-liquid-solid triple point. At high-temperatures, attraction does not affect the melting scenario that proceeds through the cascade of solid-hexatic (Berezinski-Kosterlitz-Thouless) and hexatic-liquid (first-order) phase transitions. In the case of dipolar attraction, we observed \emph{two triple points}, inherent in a 2D system: hexatic-liquid-gas and crystal-hexatic-gas, the temperature of the crystal-hexatic-gas triple point is \emph{below} the hexatic-liquid-gas triple point. This observation may have far-reaching consequences for future studies, since phase diagrams determine possible routes of self-assembly in molecular, protein, and colloidal systems, whereas the attraction range can be adjusted with complex solvents and external electric or magnetic fields. The results obtained may be widely used in condensed matter, chemical physics, materials science, and soft matter., Comment: 11 pages, 11 figures

Published
2021
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5. Practical thermodynamics of Yukawa systems at strong coupling

Author

Khrapak, Sergey A., Kryuchkov, Nikita P., Yurchenko, Stanislav O., and Thomas, Hubertus M.

Subjects
Physics - Plasma Physics, Condensed Matter - Soft Condensed Matter
Abstract

Simple practical approach to estimate thermodynamic properties of strongly coupled Yukawa systems, in both fluid and solid phases, is presented. The accuracy of the approach is tested by extensive comparison with direct computer simulation results (for fluids and solids) and the recently proposed shortest-graph method (for solids). Possible applications to other systems of softly repulsive particles are briefly discussed., Comment: Published in J. Chem. Phys

Published
2015
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6. Current progress and challenges in the development of brain tissue models: How to grow up the changeable brain in vitro?

Author

Salmina, Alla B, Alexandrova, Olga P, Averchuk, Anton S, Korsakova, Sofia A, Saridis, Mikis R, Illarioshkin, Sergey N, and Yurchenko, Stanislav O

Subjects
NEURAL development, BRAIN diseases, NEURAL stem cells, FLUID dynamics, TISSUES, BRAIN anatomy, BLOOD-brain barrier
Abstract

In vitro modeling of brain tissue is a promising but not yet resolved problem in modern neurobiology and neuropharmacology. Complexity of the brain structure and diversity of cell-to-cell communication in (patho)physiological conditions make this task almost unachievable. However, establishment of novel in vitro brain models would ultimately lead to better understanding of development-associated or experience-driven brain plasticity, designing efficient approaches to restore aberrant brain functioning. The main goal of this review is to summarize the available data on methodological approaches that are currently in use, and to identify the most prospective trends in development of neurovascular unit, blood-brain barrier, blood-cerebrospinal fluid barrier, and neurogenic niche in vitro models. The manuscript focuses on the regulation of adult neurogenesis, cerebral microcirculation and fluids dynamics that should be reproduced in the in vitro 4D models to mimic brain development and its alterations in brain pathology. We discuss approaches that are critical for studying brain plasticity, deciphering the individual person-specific trajectory of brain development and aging, and testing new drug candidates in the in vitro models. [ABSTRACT FROM AUTHOR]

Published
2024
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14. Tunable two-dimensional assembly of colloidal particles in rotating electric fields

Author

Yakovlev, Egor V., primary, Komarov, Kirill A., additional, Zaytsev, Kirill I., additional, Kryuchkov, Nikita P., additional, Koshelev, Kirill I., additional, Zotov, Arsen K., additional, Shelestov, Dmitry A., additional, Tolstoguzov, Victor L., additional, Kurlov, Vladimir N., additional, Ivlev, Alexei V., additional, and Yurchenko, Stanislav O., additional

Published
2017
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34. BWO based THz imaging system

Author

Perov, Artem N, primary, Zaytsev, Kirill I, additional, Fokina, Irina N, additional, Karasik, Valeriy E, additional, Yakovlev, Egor V, additional, and Yurchenko, Stanislav O, additional

Published
2014
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37. Medical diagnostics using terahertz pulsed spectroscopy

Author

Zaytsev, Kirill I, primary, Kudrin, Konstantin G, additional, Koroleva, Svetlana A, additional, Fokina, Irina N, additional, Volodarskaya, Svetlana I, additional, Novitskaya, Ekaterina V, additional, Perov, Artem N, additional, Karasik, Valeriy E, additional, and Yurchenko, Stanislav O, additional

Published
2014
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