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Ultrasonic study on the complexation kinetics of N,N-diethylformamide and zinc acetate in aqueous solutions

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Measurements of the ultrasonic velocity (at 1.35 MHz) and the absorption (from 1 to 45 MHz) in aqueous solutions of N,N-diethylformamide (DEFA) and zinc acetate Zn(CH3COO)2 at 20°C have been performed. The preparation of the solutions varies the molar ratio of nonelectrolyte/electrolyte, but keeps the solvent water constant.

Absorption spectra indicate relaxation processes within our frequency and concentration range. Relaxation parameters have been calculated on the basis of established models. The process discovered in the system (DEFA)–H2O–Zn(CH3COO)2 has been assigned to a formation and disintegration of solvatomers, composed of [(DEFA)Zn(H2O)3]2+ and [Zn(DEFA)2(H2O)2]2+.

Ultrasonic instruments used were a MATEC Model 7700 in pulsed mode for the high absorption liquids, and a resonator technique for low absorption with a special cell, built in the ultrasonic laboratory at the Max-Planck-Institut in Göttingen. The MATEC equipment was used also to measure the ultrasonic velocity in the solutions.
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Document Type: Research Article

Publication date: 01 January 1997

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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