19 research outputs found
ESR study of alkyl radicals adsorbed on porous Vycor glass I. Build-up of methyl and ethyl radicals
No full textMethyl and ethyl radicals have been produced on the surface of porous Vycor glass (PVG) at 77 K by UV photolysis of adsorbed azomethane and azoethane. respectively. The build-up of the radicals as a function of irradiation time has been studied by using the technique of electron spin resonance (ESR). Ethyl radicals are found to be slightly more difficult to generate than methyl radicals and both radicals were observed not to approach saturation within the period of irradiation employed. The variation of the rate of formation of the radicals with surface coverage and their formation during re-irradiation after previous decay for several hours at 77 K are discussed. (C) 2001 Elsevier Science B.V. All rights reserved
Effects of ethanol, methyl tert-butyl ether and gasoline-hydrogen blend on performance parameters and HC emission at Wankel engine
No full textAnreicherung und Trennung organischer Insecticide mit Hilfe von Polyurethanschaum-Säulen
No full textChemically-bound phases for the separation of organic complexes of metal traces in different beverages
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Effect on the Chromatographic Behavior of Gold of the Process Used to Acid-Wash Polyurethane Foam
No full textQuasi-sphärische Feststoff-Polymermembranen für Trennungen. Polymethan-Membranen als Sorbentien. Neuere Entwicklungen
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