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42 results on '"Chora̧żewski, Mirosław"'

15. Transition in fluctuation behaviour of normal liquids under high pressures

Author

Postnikov, Eugene B. and Chorążewski, Mirosław

Subjects
Condensed Matter - Statistical Mechanics, Condensed Matter - Other Condensed Matter, Physics - Chemical Physics
Abstract

We explore the behaviour of the inverse reduced density fluctuations and the isobaric expansion coefficient using {\alpha},{\omega}-dibromoalkanes as an example. Two different states are revealed far from the critical point: the region of exponentially decaying fluctuations near the coexistence curve and the state with longer correlations under sufficiently high pressures. The crossing of the isotherms of the isobaric expansion coefficient occurs within the PVT range of the mentioned transition. We discuss the interplay of this crossing with the changes in molecular packing structure connected with the analysed function of the density, which represents inverse reduced volume fluctuations., Comment: 14 pages, 4 figures

Published
2016
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26. Subnanometer Topological Tuning of the Liquid Intrusion/Extrusion Characteristics of Hydrophobic Micropores

Author

Bushuev, Yuriy G., Grosu, Yaroslav, Chora̧żewski, Mirosław A., and Meloni, Simone

Subjects
solid-liquid interface, nanoporous materials, Mechanical Engineering, Water, Bioengineering, General Chemistry, Condensed Matter Physics, NO, solid−liquid interface, Nanopores, intrusion/extrusion, Pressure, hydrophobic nanoparticles, General Materials Science, Hydrophobic and Hydrophilic Interactions, Porosity
Abstract

Intrusion (wetting)/extrusion (drying) of liquids in/from lyophobic nanoporous systems is key in many fields, including chromatography, nanofluidics, biology, and energy materials. Here we demonstrate that secondary topological features decorating main channels of porous systems dramatically affect the intrusion/extrusion cycle. These secondary features, allowing an unexpected bridging with liquid in the surrounding domains, stabilize the water stream intruding a micropore. This reduces the intrusion/extrusion barrier and the corresponding pressures without altering other properties of the system. Tuning the intrusion/extrusion pressures via subnanometric topological features represents a yet unexplored strategy for designing hydrophobic micropores. Though energy is not the only field of application, here we show that the proposed tuning approach may bring 20−75 MPa of intrusion/extrusion pressure increase, expanding the applicability of hydrophobic microporous materials.

Published
2022
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42. Acoustic and volumetric properties of triflate-based ionic liquids at high pressures.

Author

Belenkov, Roman N., Melent'ev, Vyachelav V., Sychev, Alexander V., Ryshkova, Olga S., Wasiak, Michał, Chora̧żewski, Mirosław, and Postnikov, Eugene B.

Subjects
*FREQUENCIES of oscillating systems, *ULTRASONIC measurement, *EQUATIONS of state, *IONIC liquids, *ATMOSPHERIC pressure
Abstract

We report new experimental data of the ultrasonic measurements in three ionic liquids with triflate anion: 1-ethylpyridinium triflate, 1-butyl-3-methylimidazolium triflate, diethylmethylammonium triflate. The speed of sound was determined in the temperature range of (297 – 374) K and the pressure range of (0. 1 – 196. 2) MPa. In addition, the respective densities in this range were found using the acoustic route. For the first two substances, the effect of pressure-induced solidification is detected. It is shown that the high-pressure data on the sound velocity can be accurately predicted by applying the pressure fluctuation theory-based model using parameters, which requires only the data determined at the ambient atmospheric pressure. In turn, the density can be predicted using the Fluctuation Theory-based Equation of State (FT-EoS), which includes the isothermal nonlinearity parameter, which is argued as related to the frequency of interparticle oscillations. This interdependence is confirmed by the comparative analysis with the respective peak in the low-frequency Raman–Kerr spectrum. • The speed of sound is measured and the density is determined to 196. 1 MPa. • Pressure-induced freezing of ionic liquids at macroscopic volumes is detected. • Interplay of thermodynamics and microscopic interparticle oscillations is discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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