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1Author    H. Betting, M. StockhausenRequires cookie*
 Title    Dielectric Relaxation Study of Some Solutions Containing /3-Cyclodextrin and Dimethylsulfoxide  
 Abstract    Dielectric spectra have been measured up to 72 GHz at 20°C for solutions of /3-cyclodextrin (CD) in the following solvents over the whole solubility range of CD: dimethylsulfoxide (DMSO), DMSO/ I,4-dioxane mixture (2:1 molar ratio), DMSO/water mixtures (2:1 and 1:2). The spectra are analyzed into a sum of Debye type spectral components. These are likely to be caused by different physical pro-cesses. The discussion shows (i) that there is a preferential CD-DMSO interaction, by far exceeding the CD-water interaction, and (») that, concerning CD-DMSO, a loose interaction can be distinguished from the formation of an inclusion complex. 
  Reference    Z. Naturforsch. 54a, 382—386 (1999); received April 19 1999 
  Published    1999 
  Keywords    Association, Dielectric Spectroscopy, Liquids 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0382.pdf 
 Identifier    ZNA-1999-54a-0382 
 Volume    54 
2Author    S. A. Markarian, M. StockhausenRequires cookie*
 Title    Dielectric Relaxation of Diethylsulfoxide  
 Abstract    The dielectric loss spectrum of the title substance has been measured in its pure liquid state between 10 MHz and 72 GHz at 20°C. In comparison to the Debye function, it is slightly broadened towards the high frequency side. The maximum cor-responds to a relaxation time of 51 ps. In view of the molecu-lar size and viscosity, this is relatively long and thus indicative of associative intermolecular effects as in the case of the homol-ogous compound dimethylsulfoxide. 
  Reference    Z. Naturforsch. 55a, 667—668 (2000); received April 25 2000 
  Published    2000 
  Keywords    Association, Dielectric Relaxation, Liquids 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0667_n.pdf 
 Identifier    ZNA-2000-55a-0667_n 
 Volume    55 
3Author    S. A. Markarian, A. S. Galstian, M. Stockhausen3Requires cookie*
 Title    A Dielectric Relaxation Study of Diethylsulfoxide/ Tetrachloromethane Binary Mixtures  
 Abstract    The dielectric spectra o f diethylsulfoxide (DESO)/tetrachloromethane mixtures have been measured from 0.5 to 72 GHz at 20 °C. On the basis of the relation between the relaxation time and the DESO concentration a complex formation between DESO and tetrachloromethane is suggested. 
  Reference    Z. Naturforsch. 56a, 785—7 (2001); received September 27 2001 
  Published    2001 
  Keywords    Association, Dielectric Spectroscopy, Liquids 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0785.pdf 
 Identifier    ZNA-2001-56a-0785 
 Volume    56 
4Author    H. Betting, M. StockhausenRequires cookie*
 Title    Dielectric Relaxation of Hexadeutero Dimethylsulfoxide  
 Abstract    The dielectric relaxation parameters of the title substance (DMSO-d fi) in its pure liquid state are determined from meas-urements up to 72 GHz at 20°C in comparison to protonated DMSO. While the relaxation strengths do not differ, the relax-ation time of DMSO-d 6 is significantly longer (21.3 ps) than that of DMSO (19.5 ps). 
  Reference    Z. Naturforsch. 54a, 661 (1999); received September 7 1999 
  Published    1999 
  Keywords    Dielectries, Isotopic Substitution, Liquids, Rela-xation 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0661_n.pdf 
 Identifier    ZNA-1999-54a-0661_n 
 Volume    54 
5Author    M. Wichmann, M. StockhausenRequires cookie*
 Title      
 Abstract    Relaxation spectra have been measured at 20°C for mono-, di-and triethanolamine in the pure liquid state and in a 0.6 mole fraction mixture with 1,4-dioxane. The general resemblance to the dielectric behaviour of alcohols and aminoalcohols shows that relaxation is governed by association effects. In this regard, several features point to significantly differing behaviour of the mono compound in comparison with both di-and triethanol­ amine. 
  Reference    Z. Naturforsch. 56a, 603—604 (2001); received June 18 2001 
  Published    2001 
  Keywords    Association, Dielectric Spectroscopy, Hydrogen Bonding, Liquids 
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 TEI-XML for    default:Reihe_A/56/ZNA-2001-56a-0603_n.pdf 
 Identifier    ZNA-2001-56a-0603_n 
 Volume    56 
6Author    D. Schiel, W. Richter, G. DögeRequires cookie*
 Title    CH3F/CD3F System  
 Abstract    It has been proved with the aid of CH3F/CD3F mixtures that the remarkably large non-coincidence effect in the Raman scattering spectrum of the v 3 mode of liquid methyl fluoride is due to intermolecular vibrational coupling medi-ated mainly by transition dipole interaction. The amount of the effect and its temperature and mole fraction dependence are -at least qualitatively -in agreement with Logan's theoretical concept. The rather different behaviour of the isotopic species and the asymmetry and narrow width of the isotropic band, however, raise new questions which require further investigations. 
  Reference    Z. Naturforsch. 45a, 1381—1382 (1990); received September 26 1990 
  Published    1990 
  Keywords    Raman spectroscopy, Liquids, Intermolecular interactions, Isotopic dilution, Band shift 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-1381_n.pdf 
 Identifier    ZNA-1990-45a-1381_n 
 Volume    45 
7Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    Acceleration of mass transfer in gas I liquid-reactions by sonic vibrations: fat hydrogenation as a test reaction A method for increasing the mass transfer in gas/liquid-reactions by application of sonic vibration is described. The operating frequencies have been chosen such that the surfaces of the gas bubbles vibrate in resonance. At these operating frequencies (up to 1000 Hz), the damping of sound waves by the bubbly liquid is low, which is important in large-scale applications. Hydrogenation of soybean oil in a bubble column has been carried out as a test reaction. An increase in mass transfer from dispersed bubbles to the liquid in terms of fcL aG of up to 36% has been effected by a relatively small amount of sonic power. B e s c h le u n ig u n g d e s S to f f a u s ta u s c h e s von G a s -F lü s s ig k e its -R e a k tio n e n d u rc h S c h a llw e lle n a m B e isp ie l d e r F e tth ä r tu n g 
  Reference    Z. Naturforsch. 50a, 228—234 (1995); received November 14 
  Published    1995 
  Keywords    Mass transfer, Fat hydrogenation, Gas, Liquid, Sound, Surface waves 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0228.pdf 
 Identifier    ZNA-1995-50a-0228 
 Volume    50 
8Author    U. Schlenz, A. Dölle, H. G. HertzRequires cookie*
 Title     
 Abstract    o le c u la r M o tio n in L iq u id s : T h e P a r ti a ll y R ig id M o le c u le 1,2 ,3 » 4 -T e tr a h y d r o -5 ,6 -D im e th y l-l ,4 -M e th a n o n a p h th a le n e . T e m p e r a tu r e D e p e n d e n c e o f 13C M a g n e tic R e la x a tio n a n d C o r r e la tio n T im e s Dedicated to Professor W . Müller-Warmuth on occasion of his 65 th birthday For the hydrocarbon l,2,3,4-tetrahydro-5,6-dimethyl-l,4-methanonaphthalene (5,6-Me2-THMN) 13C longitudinal relaxation times and NOE factors were measured over a wide temperature range at frequencies of 22.63 and 100.62 MHz. Additionally, 13C transversal relaxation times were mea­ sured at 100.62 MHz. The relaxation data show that the dispersion region is already reached at moderate temperatures. The experimental data were modeled by the combination of the Vogel-Fulcher-Tammann ansatz and a scaling of the dipolar coupling constant with a factor of 0.70. From the fit of the data also activation parameters of the rotational motion of the molecules were obtained. Although the molecules of 5,6-Me2-THMN have a rigid structure (except the two inter­ nally rotating methyl groups), the model of the rotational diffusion of rigid bodies does not satisfactorily describe the relaxation data. 
  Reference    Z. Naturforsch. 50a, 631—642 (1995); received December 16 1994 
  Published    1995 
  Keywords    Liquids, Rotational Diffusion, Rotational Correlation Times, 13C Nuclear Magnetic Resonance, Relaxation 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0631.pdf 
 Identifier    ZNA-1995-50a-0631 
 Volume    50