Absorption of ultrasonic waves in aqueous solutions ofN‐methylacetamide and zinc chloride
作者:
Piotr Miecznik,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1990)
卷期:
Volume 88,
issue 5
页码: 2284-2290
ISSN:0001-4966
年代: 1990
DOI:10.1121/1.400071
出版商: Acoustical Society of America
关键词: ULTRASONIC WAVES;ABSORPTION;AQUEOUS SOLUTIONS;ZINC CHLORIDES;ACETAMIDE;METHYL COMPOUNDS;MHZ RANGE 01−100;RELAXATION
数据来源: AIP
摘要:
Measurements of the absorption coefficient of ultrasonic waves have been made within the frequency range of 10–100 MHz in aqueous solutions ofN‐methylacetamide (NMAA) and zinc chloride (ZnCl2). The method used to prepare quasi‐two‐component solutions permitted a change in the ratio of the number of amide molecules to electrolyte molecules, given a constant number of water molecules. The results indicate the occurrence of a single relaxational process in the solutions under investigation and the frequency range adopted. On the basis of the theory of relaxational absorption of sounds, relaxation parameters as well as the enthalpy of activation of the solution in question, which was 16.4 kJ/mol, have been calculated. The character of the relaxational process observed was determined on the basis of the analysis of relaxational curves. The discovered relaxational process in H2O–NMAA–ZnCl2was ascribed to the formation and disintegration of ‘‘solvatomers’’ composed of [NMAA Zn(H2O)3]2+.
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