A Dielectric Relaxation Study of Diethylsulfoxide/ Tetrachloromethane Binary Mixtures

2001 ◽  
Vol 56 (11) ◽  
pp. 785-787 ◽  
Author(s):  
S. A. Markarian ◽  
A. S. Galstian ◽  
M. Stockhausen
Keyword(s):  
Relaxation Time ◽  
Complex Formation ◽  
Dielectric Relaxation ◽  
Binary Mixtures ◽  
Dielectric Spectra ◽  
Relaxation Study

Abstract The dielectric spectra of 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.

scholarly journals Molecular Association of Tetramethylurea and Chlorobenzene Molecules in Microwave Frequency Range

2010 ◽  
Vol 65 (10) ◽  
pp. 854-858
Author(s):  
Vimal Sharma ◽  
Nagesh Thakur
Keyword(s):  
Relaxation Time ◽  
Dielectric Relaxation ◽  
Viscous Flow ◽  
Relaxation Process ◽  
Binary Mixtures ◽  
Variation Method ◽  
Dielectric Relaxation Time ◽  
Flow Process ◽  
Dielectric Relaxation Process ◽  
Energy Parameters

The dielectric constant ε´ and dielectric loss ε´´ of the binary mixtures of tetramethylurea (TMU) and chlorobenzene (CB) have been calculated at 9.883 GHz by using standard standing microwave techniques. Gopalakrishna’s single frequency concentration variation method has been used to calculate dipole moment μ and dielectric relaxation time τ for different mole fractions of TMU in the binary mixture at different temperatures of 25 °C, 30 °C, 35 °C, and 40 °C. The variation of dielectric relaxation time with the mole fraction of TMU in the whole concentration range of the binary mixtures was found to be non-monotonic. The solute-solute and solute-solvent type of molecular associations may be proposed based upon above observations. Using Eyring rate equations the energy parameters ΔH, ΔF, and ΔS for the dielectric relaxation process and the viscous flow process have been calculated at the given temperatures. It is found from the comparison of energy parameters that, just like the viscous flow process, the dielectric relaxation process can also be treated as a rate process.

Dielectric Relaxation Study of Some Solutions Containing β-Cyclodextrin and Dimethylsulfoxide

1999 ◽  
Vol 54 (6-7) ◽  
pp. 382-386
Author(s):  
H. Betting ◽  
M. Stockhausen
Keyword(s):  
Inclusion Complex ◽  
Dielectric Relaxation ◽  
Molar Ratio ◽  
Dielectric Spectra ◽  
Solubility Range ◽  
Water Interaction ◽  
Spectral Components ◽  
Relaxation Study ◽  
Dioxane Mixture

Abstract Dielectric spectra have been measured up to 72 GHz at 20°C for solutions of β-cyclodextrin (CD) in the following solvents over the whole solubility range of CD: dimethylsulfoxide (DMSO), DMSO/ 1,4-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.

scholarly journals Disruption of the self-molecular association of pentanol in binary mixtures with alkylbenzoates: a dielectric relaxation spectroscopy study

RSC Advances ◽  
2016 ◽  
Vol 6 (2) ◽  
pp. 1260-1267 ◽  
Author(s):  
Samiyara Begum ◽  
Abhinay Vardhan ◽  
Atul Chaudhary ◽  
Ranga Subramanian
Keyword(s):  
Dielectric Relaxation ◽  
Binary Mixtures ◽  
Molecular Association ◽  
The Self ◽  
Dielectric Relaxation Spectroscopy ◽  
Spectroscopy Study ◽  
Rich Region ◽  
Relaxation Study

A dielectric relaxation study of binary mixtures of associative pentanol isomers and non-associative alkylbenzoates at different mole fractions revealed that the effective dipole rotates faster in the alkylbenzoate rich region.

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