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Your search keyword '"Jana Donovalová"' showing total 2 results
Start Over Author "Jana Donovalová" Journal ultrasonics sonochemistry
2 results on '"Jana Donovalová"'

1. Method for comparing the efficiency of ultrasound irradiation independent of the shape and the volume of the reaction vessel in sonochemical experiments

Author

Anton Gáplovský, T. Kimura, Š. Toma, Martin Gáplovský, Jana Donovalová, and T. Vencel

Subjects
Acoustics and Ultrasonics, Analytical chemistry, chemistry.chemical_element, Complex Mixtures, Radiation Dosage, Oxygen, Sonochemistry, Inorganic Chemistry, Sonication, Chemical Engineering (miscellaneous), Environmental Chemistry, Scattering, Radiation, Radiology, Nuclear Medicine and imaging, Computer Simulation, Radiometry, business.industry, Organic Chemistry, Ultrasound, Equipment Design, Chemical reactor, Fluorescence, Volume (thermodynamics), chemistry, Models, Chemical, Cavitation, business, Intensity (heat transfer), Algorithms
Abstract

The method described herein this review compares the efficiency of ultrasound irradiation in sonochemical experiments in organic solvents. This method was shown to be independent of the shape and volume of the reaction vessel. The principle of this method is based on the fact that the concentration of dissolved oxygen in the entire reaction volume during acoustic cavitation depends on the ultrasound power or intensity of ultrasound field respectively. The concentration of dissolved oxygen is determined by the measurement of the fluorescence intensity with fluorescence probes.

Published
2005

2. Ultrasound effects on photochemical reactions, part 1: photochemical reactions of ketones with alkenes

Author

Štefan Toma, Róbert Kubinec, Jana Donovalová, and Anton Gáplovský

Subjects
Acoustics and Ultrasonics, business.industry, Sonication, Organic Chemistry, Ultrasound, Cyclohexene, Cyclohexanone, Photochemistry, Sonochemistry, Inorganic Chemistry, chemistry.chemical_compound, chemistry, Excited state, Acetone, Chemical Engineering (miscellaneous), Environmental Chemistry, Radiology, Nuclear Medicine and imaging, Triplet state, business
Abstract

Ultrasound considerably enhances and simplifies photochemical reaction of cyclohexanone with cyclohexene. The Paterno-Buchi reaction of acetone with ethyl vinyl ether is enhanced by ultrasound and yields a different ratio of cis/trans oxetanes under sonication by comparison with the silent reaction. Sonication appears to affect the first reaction by homogenization of excited intermediates and by quenching the excited triplet state at the second reaction.

Published
1997

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