Relaxation Time of Concentration Fluctuations in a Vicinity of the Critical Stratification Point of the Binary Mixture n-Pentanol–Nitromethane

Bulavin, L. A.; Bilous, O.I.; Svechnikova, O.S.

doi:10.15407/ujpe61.10.0879

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…A further frequency growth to 400-2800 MHz results in the appearance of nontypical anomalous dependences for the fluctuation part of the sound absorption coefficient; i.e. the anomalies have a non-universal character, which may probably be associated with both molecular mechanisms and the sound scattering by concentration fluctuations [15] (see panels 5 to 9 in Fig. 1).…”

Section: Three-dimensional Representations For the Sound Absorption Cmentioning

confidence: 99%

Anomalies of the Sound Absorption Coefficient for Binary Solutions with a Critical Stratification Temperature

et al. 2018

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The results of the analysis of experimental data concerning the sound absorption in the nitromethane--pentanol and nitrobenzene--hexane solutions obtained in a wide frequency interval of 5-2800 MHz and measured along the isotherms and isoconcentrates, including their critical values, are presented. The detected anomalous dependences of the sound absorption coefficient were found to obey the laws of the dynamic scaling theory only in the fluctuation region of the problem parameters, fl ≫ 1. The sound frequency growth ( ≥ 110 MHz) in the examined frequency interval, as well as moving away from the critical temperature and concentration values, is proved to transit the system from the critical region into the crossover, fl ∼ 1, or even hydrodynamic, fl ≪ 1, one. K e y w o r d s: sound absorption coefficient, critical stratification point, binary solution, concentration fluctuations, acoustic relaxation.

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Section: Three-dimensional Representations For the Sound Absorption Cmentioning

confidence: 99%

Anomalies of the Sound Absorption Coefficient for Binary Solutions with a Critical Stratification Temperature

et al. 2018

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“…The properties of liquid systems in the vicinity of their singular points are researched using various methods [15][16][17][18][19][20], in particular, acoustic spectroscopy [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Адіабатична Стисливість Водних Розчинів Поліолів

Saienko

Svechnikova

2021

Ukr. J. Phys.

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За експериментальними даними про густину i швидкiсть поширення ультразвукових хвиль проведено розрахунки адiабатичної стисливостi у водних розчинах еритриту, ксилiту, сорбiту i манiту. Встановлено, що температурнi залежностi адiабатичної стисливостi дослiджених систем проходять через мiнiмуми. Зi збiльшенням концентрацiї полiолу у водi мiнiмум адiабатичної стисливостi змiщується у бiк нижчих температур. Розраховано значення температур мiнiмумiв молярної адiабатичної стисливостi. Показано, що концентрацiйна залежнiсть температур мiнiмуму молярної адiабатичної стисливостi носить лiнiйний характер. Встановлено наявнiсть особливої точки для дослiджуваних водних розчинiв полiолiв.

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Similar Behavior of Rheological Properties and the Evaluation of the Melting Temperatures of Fluorinated Aliphatic Alcohols

Hetalo¹,

Khorolskyi²,

Stetsenko³

et al. 2020

Ukr. J. Phys.

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On the basis of experimental data obtained for the viscosity, density, and refractive index of fluorinated alcohols and proceeding from the similarity laws, the structural features of molecules of the researched liquids are determined. A comparison of molecular refraction values determined for fluorinated and non-fluorinated alcohols made it possible to reveal a modification of the structure of fluorinated alcohol molecules. Namely, this is a probable minor change in the arrangement of fluorine atoms in the alcohol molecule, at which the structure of a molecule remains similar to the structure of molecules of aliphatic alcohols. A similarity in the behavior of the rheological properties of 2,2,3,3-tetrafluoropropan-1-ol and 1H,1H-pentafluoropropan-1-ol, on the one hand, and propan-1-ol, on the other hand, as well as 1H,1H,7H-dodecafluoroheptan-1-ol and 1H,1H-tridecafluoroheptan-1-ol, on the one hand, and heptan-1-ol, on the other hand, is found. A method for estimating the melting temperatures of halogenated molecular liquids, which is based on the similarity of the rheological properties of those liquids, is proposed. The melting temperatures for 1H,1H-pentafluoropropan-1-ol, Tm = (244.5 ± 1.0) K, and 1H,1H-tridecafluoroheptan-1-ol, Tm = (255.0 ± 1.0) K, which are not available in the literature, are evaluated.

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Relaxation Time of Concentration Fluctuations in a Vicinity of the Critical Stratification Point of the Binary Mixture n-Pentanol–Nitromethane

Cited by 3 publications

References 20 publications

Anomalies of the Sound Absorption Coefficient for Binary Solutions with a Critical Stratification Temperature

Anomalies of the Sound Absorption Coefficient for Binary Solutions with a Critical Stratification Temperature

Адіабатична Стисливість Водних Розчинів Поліолів

Similar Behavior of Rheological Properties and the Evaluation of the Melting Temperatures of Fluorinated Aliphatic Alcohols

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