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Effects of alcohol addition on decay of sonoluminescence intensity
摘要： The observation of multibubble sonoluminescence (MBSL) during acoustic cavitational bubble collapse is known to be an appropriate approach to obtain physicochemical information about high-temperature and high-pressure sites generated under sonication. MBSL spectra observed when ultrasound is irradiated to Ar-saturated water can be classified into two categories; a continuum spectrum fraction over a wide range of wavelengths, and a clear peak located at around 310 nm, which is assignable to OH. So far, temporal changes in MBSL spectra have been reported in the presence of alcohols, which scavenge radicals generated in the sonochemical reaction [1]. The spectral changes are presumed to be due to gaseous products generated by the ultrasound decomposition of alcohols. The present study was carried out to investigate the correlation between spectral changes and the products of the sonochemical reaction including hydrogen peroxide and gaseous products from alcohols.
关键词： Gaseous product,Hydrogen peroxide,Sonochemistry,Alcohol addition,Sonoluminescence
更新于2025-11-19 16:51:07
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Spectroscopic measurement of electronic temperature in the bubbles during single- and multibubble sonoluminescence of metal carbonyl solutions and nanodispersed suspensions
摘要： It is for the first time that we have obtained emission-line spectra of metal atoms during single-bubble sonoluminescence of metal carbonyl W(CO)6, Mo(CO)6, Cr(CO)6 solutions in dodecane and similar spectra during single- and multibubble sonoluminescence of nanodispersed Cr(CO)6 suspensions in water, 83% H2SO4 and 74% H3PO4. Nanodispersed suspensions with an average particle size of 15–20 nm were obtained through sonodispersing and filtering Cr(CO)6 crystals in water. The method for comparing the intensities of two atomic metal lines made it possible to measure the electronic temperatures achieved in cavitation bubbles under different modes of sonolysis that vary in the range of (4.5–16)·103 K depending on the mode of sonolysis, the type of liquid and saturating gas (He, Ar, Kr) and the acoustic energy entering the solution or suspension. The electronic temperature for multibubble sonoluminescence is, on the average, by (2–2.5)·103 K less than for single-bubble sonoluminescence for all liquids in question.
关键词： Single-bubble sonoluminescence,Multibubble sonoluminescence,Metal carbonyls,Electronic temperatures
更新于2025-09-23 15:21:21
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Mechanism of the Ru(bpy)32+ single-bubble sonochemiluminescence in neutral and alkaline aqueous solutions
摘要： The paper addresses sonochemiluminescence generated by a single bubble levitating in neutral and alkaline aqueous solutions of Ru(bpy)3Cl2. Generally, this sonochemiluminescence was found to obey the rules identified previously for multi-bubble sonochemiluminescence and to be described by reactions between the Ru(bpy)3·2+ ion and the radical products Н·, ОН·, and eaq in solution. These products arise in the bubble upon decay of low-temperature plasma and migrate to the solution as the bubble intensively moves and its spherical shape is distorted as a result of a change in the acoustic pressure above and below the stability threshold. Some radicals can also get into the solution from a stationary bubble. The difference from the multibubble sonochemiluminescence is that luminescence intensity has a higher contribution of the re-emission effect of bubble luminescence by Ru(bpy)32+ ions. In solutions with low concentrations of the complex (10–6-10–5 М) and the bubble being stationary, this effect provides up to 2/3 of the total ruthenium emission intensity. It is suggested that the hydrated electrons, which increase the yield of sonochemiluminescence, can be generated upon single-bubble sonolysis of neutral solutions rather than only upon conversion of H atoms in alkaline solutions, as is the case for the multi-bubble sonochemiluminescence.
关键词： tris-bipyridyl ruthenium(II) complex,chemiluminescence,single-bubble sonoluminescence
更新于2025-09-04 15:30:14