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  • 1
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 191 (1961), S. 1292-1292 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table 1 Colorimetric readings in presence of: Expo- Methyl ethyl n- n- Diace- sure alco- alco- propyl butyl tone Ace- (min.) Blank hoi hoi alco- alco- alco- tone Dioxan Ether hoi hoi hoi 0 338 338 338 337 338 337 338 338 337 5 126 313 330 335 337 330 335 337 334 10 65 310 327 333 335 328 ...
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 188 (1963), S. 59-61 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Ultraschallbestrahlung mit einemMullard-Generator und Bariumtitanatkristall als Übertrager (1 MHz) diente zur Beobachtung der Entfärbung wäßriger Bromkresolgrünlösungen. Die mikroskopischen Adsorptionskurven zeigen das Verschwinden der Farbe mit der Zeit an. Gegenwart geringer Beträge von Äthylalkohol, n-Propylalkohol, n-Butylalkohol, Diaceton, Alkohol und Aceton stoppen die Verfärbung. Ursache scheint Kavitation zu sein.
    Notes: Summary Ultrasonic radiations from aMullard generator with barium titanate crystal as transducer having a frequency 1 Mc/sec, have been used to study the decolorization of an aqueous solution of bromocresol green. Absorption curves obtained from spectrophotometric data demonstrate the fading of the colour of the dyestuff with the time of exposure. The presence of small amount of ethyl alcohol, n-propyl alcohol, n-butyl alcohol, diacetone alcohol and acetone separately inhibit the fading. Cavitation seems to be the cause of decolorization.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 175 (1961), S. 50-53 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Ultraschallbestrahlung von einemMullard-Generator mit Bariumtitanat-Kristallen als Schallgeber (Frequenz 1 MHz; 225 W/cm2 als Strahlungsleistung) wurde angewandt, um die Entfärbung von wäßrigen Lösungen aus Brillantgrün zu untersuchen. Die erhaltenen Adsorptionskurven aus spektrometrischen Daten zeigen das Verschwinden des Farbstoffs mit wechselnder Zeit der Bestrahlung. Die Reaktion ist unimolekular, und die mittleren Geschwindigkeitskonstanten sind 0,739, 0,452 und 0,365 für die Konzentrationen 0,0064, 0,0096 und 0,0128 g/l. Die Anwesenheit geringer Beträge von Äthylalkohol unterbindet die Entfärbung. Gravitation und Oxydation, verursacht durch die Gegenwart von Spuren aktivierten Sauerstoffs aus der gelösten Luft, scheinen die Ursache für die Entfärbung zu sein.
    Notes: Summary Ultrasonic radiations from aMullard generator with barium titanate crystal as transducer having a frequency 1 MC/sec. and power output 225 W/sq. cm. have been used to study the decolourisation of aqueous solutions of brilliant green dye. Absorption curves obtained from spectrophotometric data demonstrate the fading of the colour of the dyestuff with the time of exposure. The reaction has been found to he unimolecular and average velocity constants are 0.739, 0.452 and 0.365 for concentrations 0.0064, 0.0096 and 0.0128 g./l. respectively. The presence of small amount of ethyl alcohol inhibits the fading. Cavitation and oxidation due to the presence of some activated oxygen from the dissolved air seem to be the cause of fading.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 187 (1963), S. 53-56 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Ultraschallbestrahlung (1 MHz, 225 W/cm2) erlauben die Untersuchung der Entfärbung von wä\riger Safranin-O-Lösung. Die erhaltenen spektrometrischen Daten zeigen das Verschwinden der Farbe im Laufe der Zeit. Diaceton-Alkohol, n-Propyl-, n-Butyl- und äthylalkohol, Dioxan und äther verhindern die Entfärbung. Wasserstoffperoxid beschleunigt sie nicht. Die Farbstoffmoleküle werden offensichtlich durch Kavitation abgebaut.
    Notes: Summary Ultrasonic radiation from Mullard generator with barium titanate crystal as transducer having a frequency of 1 Mc/sec and power output 225 w/sq. cm. have been used to study the decolorization of aqueous solution of safranine O. Absorption curves obtained from spectrophotometric data demonstrate the fading of the colour of the dyestuff with the time of exposure. Diacetone alcohol, n-propyl alcohol, n-butyl alcohol, ethyl alcohol, dioxan and ether inhibit the decolorization. Hydrogen peroxide does not help the decolorization. Cavitation is responsible for breaking the molecules of the dye.
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 188 (1963), S. 136-138 
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Einfluß von Ultraschall (1 mHz, 225 W/cm2) auf negativ geladenes Mangandioxidsol wurde unter Stickstoff unter Ausschluß von Sauerstoff untersucht. Die Stabilität des Sols ist in gleicher Weise wie bei Gegenwart von Luft verändert, nur wird das Sol bei Ausschluß von Sauerstoff weniger instabil. Die spezifische Leitfähigkeit steigt mit steigender Expositionszeit, während die Wasserstoffionenkonzentration praktisch konstant bleibt.
    Notes: Summary The influence of ultrasonic waves at 1 MC/sec and 225 watts/cm2 power on the negatively charged manganese dioxide sol has been investigated in an atmosphere of nitrogen and thereby excluding oxygen. The stability of the sol on exposure to ultrasonic waves is affected in a similar way as in presence of air but the extent to which the sol gets unstable on exposure is less in the absence of oxygen than in its presence. The specific conductivity increases but hydrogen ion concentration remains practically constant as the time of exposure increases.
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  • 6
    Publication Date: 1963-01-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 7
    Publication Date: 1961-03-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 8
    Publication Date: 1963-04-01
    Print ISSN: 0372-820X
    Electronic ISSN: 1435-1536
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 9
    Publication Date: 1961-09-01
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Springer Nature
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  • 10
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 84 (1962), S. 3411-3412 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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