Аномалії коефіцієнта поглинання звуку бінарних розчинів з критичною температурою розшарування

• Main Authors: Bulavin, L. A., Bilous, O. I., Balega, A. V., Svechnikova, O. S.
• Format: Article
• Language: English; Ukrainian
• Published: Publishing house "Academperiodika" 2018
• Subjects: коефiцiєнт поглинання звуку; критична точка розшарування; бiнарний розчин; флуктуацiї концентрацiї; акустична релаксацiя; sound absorption coefficient; critical stratification point; binary solution; concentration fluctuations; acoustic relaxation
• Online Access: https://ujp.bitp.kiev.ua/index.php/ujp/article/view/2018161

The results of the analysis of experimental data concerning the sound absorption in the nitro-methane–n-pentanol and nitrobenzene-n-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, wтfl ≫ 1. The sound frequency growth (f ≥ 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, wтfl ∼ 1, or even hydrodynamic, wтfl ≪ 1, one.