Source: http://ejta.org/en/gordeychuk1
Timestamp: 2019-04-22 17:57:27+00:00

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Sonoluminescence (SL) is light emission under high-temperature and high-pressure conditions of a cavitating bubble under intense ultrasound in liquid. The mechanisms involved in the atomic metals emission during SL from the solutions of the nonvolatile metals compounds are still under debate. The present study examines the emission from electronically excited sodium atoms and includes two aspects: (1) the line shape in SL spectra from argon saturated aqueous solutions of alkyl sulfates with different carbon-chain length (CnH2n+1SO4Na, n=1, 12, 14), and (2) the influence of different surfactants on the intensity of Na emission from argon saturated aqueous NaCl solutions. The shape of Na line in SL spectra consists of the broad asymmetrically shifted component and the unshifted narrow doublet. The broad component is considered to result from highly compressed cavitating bubble content. The origin of narrow component is unclear. The study showed for sodium methyl sulfate (n=1) the line shape was the same as that in spectra from NaCl solutions and showed mainly the broad component. For surfactants with long carbon-chain (n= 12, 14) the broad component was suppressed while the narrow one was well-marked. It is known that the intensity of Na emission in SL spectra from anionic surfactants solutions is much higher than in the spectra from NaCl solutions. The offered explanation is the forming an electrostatic surface potential which attracts Na+ ions to the bubble surface. Present study showed that the presence of any type of surfactants (anionic, cationic, zwitterionic, nonionic) had been leading to the rise of intensity of Na emission. The effect was most significant for the anionic and nonionic surfactants and increased with the growth of NaCl concentration. The results was interpreted in terms of changing of dynamic properties of the bubble surface due to presence of surfactants.
Сitation: T. Gordeychuk, M. Kazachek. Atomic Na emission during sonoluminescence from aqueous solutions of different types of surfactants. Electronic Journal “Technical Acoustics”, http://www.ejta.org, 2017, 4.
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Tatyana Gordeychuk – PhD, V.I.Il'ichev Pacific Oceanological Institute, Far Eastern Branch of RAS (https://www.poi.dvo.ru/drupal/en), Vladivostok, Russia, senior researcher G.I.Nevelskoy Maritime State University, Vladivostok, Russia. assistant professor. The area of scientific interests - physical acoustics, physical and biological effects of ultrasound, cavitation, sonoluminescence.
Mikhail Kazachek – PhD, V.I.Il'ichev Pacific Oceanological Institute, Far Eastern Branch of RAS (https://www.poi.dvo.ru/drupal/en), Vladivostok, Russia. Senior researcher. The area of scientific interests - spectroscopy, quantum chemistry, sonoluminescence.

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