Dielectric relaxation studies of aqueous N,N-dimethylformamide using a picosecond time domain technique

Kumbharkhane, A.C.; Puranik, S. M.; Mehrotra, S. C.

doi:10.1007/bf00649245

Cited by 170 publications

(80 citation statements)

References 19 publications

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“…The effective averaged angular Kirkwood correlation factor g eff [26,27] of the mixed solvents was determined by the following volume fractionweighted mixture law: (7) where g eff is the effective Kirkwood correlation factor for a binary mixture, and Φ A , Φ B are volume fraction of liquid A and liquid B, respectively.…”

Section: Resultsmentioning

confidence: 99%

Dielectric dispersion in 1,2-diaminopropane–dimethylaminoethanol mixtures as a function of composition and temperature

Undre¹,

Khirade²

2011

Lith. J. Phys.

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The dielectric dispersion ε' and dielectric loss ε" of binary mixture of 1,2-diaminopropane-dimethylaminoethanol were measured by employing the time domain reflectometry technique over a frequency range from 10 MHz to 20 GHz at 288, 298, 308, and 318 K temperatures. The accuracy in the measurement of the ε' and ε" values obtained from this technique is within ±5%. To evaluate various dielectric parameters, the frequency dependents complex permittivity (ε*(ω) = ε' -iε") data, viz., static permittivity ε 0 , relaxation time τ, and permittivity at high frequency ε ∞ were fitted by the nonlinear least-squares fit method to Debye expression. Temperature dependent ε 0 , τ, Kirkwood correlation factor g, free energy of activation ΔG, and enthalpy of activation ΔH have been determined and discussed in terms of the effect of -NH 2 and -CH 3 side-group on molecular dynamics and intermolecular hydrogen bonds. The dielectric behaviour of 1,2-diaminopropane and dimethylaminoethanol liquid molecules and their conformations as well as molecular dynamics of the system can be explored only by comparing the dielectric data of the mixture system with the dielectric data of the individual molecules and their dynamics.

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Section: Resultsmentioning

confidence: 99%

Dielectric dispersion in 1,2-diaminopropane–dimethylaminoethanol mixtures as a function of composition and temperature

Undre¹,

Khirade²

2011

Lith. J. Phys.

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show abstract

“…The excess parameters [6,28] related to ε 0 and τ provide valuable information regarding interaction between the (solute-solvent) polar-polar liquid mixtures. These properties are also useful for detection of the cooperative domain in the mixture and may evidence formation of multimers in the mixture due to intermolecular interaction.…”

Section: Resultsmentioning

confidence: 99%

“…The effective angular correlation g eff between molecules is calculated using a modified form of Eq. (4) [6,33]. The g eff has been used to study the orientation of electric dipoles in binary mixtures.…”

Section: Resultsmentioning

confidence: 99%

“…The g eff has been used to study the orientation of electric dipoles in binary mixtures. The Kirkwood equation for the mixture may be expressed as [6,33] 4πN 9kT…”

Section: Resultsmentioning

confidence: 99%

“…The dielectric relaxation behaviour of mixtures of polar molecules under varying conditions of compositions is very important as it helps in obtaining information about relaxation process in mixtures. There have been several investigations on the dielectric behaviour of solvent mixtures in which dielectric relaxation spectra have been used to examine molecular orientations, hydrogen bonded networks, and microdynamics of these systems [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Dielectric studies on binary mixtures of formamide with ethanolamine using the time domain technique

Undre¹,

Khirade²,

Jagdale³

et al. 2011

Lith. J. Phys.

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Dielectric relaxation measurements on formamide (FA) -ethanolamine (ETA) solvent mixtures have been carried out across the entire concentration range using time domain reflectometry technique at 15, 25, 35, and 45• C over the frequency range from 10 MHz to 10 GHz. The mixtures exhibit a principle dispersion of the Davidson-Cole relaxation type at microwave frequencies. Bilinear calibration method is used to obtain complex permittivity ε * (ω) from complex reflection coefficient ρ * (ω) over the frequency range 10 MHz to 10 GHz. The excess permittivity ε E , excess inverse relaxation time (1/τ ) E , Kirkwood correlation factor g eff , and thermodynamic parameters such as Gibbs energy of activation ∆G and molar enthalpy of activation ∆H are also calculated to study the solute-solvent interaction.

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A New Model of Dielectric Constant for Binary Solutions

Wang

Yuanli

et al. 2000

Chem. Eng. Technol.

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From the group statistical theory, and with a pseudochemical reaction mechanism, a new universal equation is proposed to calculate the dielectric constant for binary solutions. The simple form of the new model makes it convenient to use and all its parameters have obvious physical meanings. With this model, we explained the experimental phenomena and empirical rules in cited works. Tested by 225 kinds of binary systems, the overall average relative deviation at 4228 data sets is 0.775 % and the results show that this new model is more accurate than the cited models. This model is especially suitable for associative and asymmetric systems.

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Dielectric relaxation studies of aqueous N,N-dimethylformamide using a picosecond time domain technique

Cited by 170 publications

References 19 publications

Dielectric dispersion in 1,2-diaminopropane–dimethylaminoethanol mixtures as a function of composition and temperature

Dielectric dispersion in 1,2-diaminopropane–dimethylaminoethanol mixtures as a function of composition and temperature

Dielectric studies on binary mixtures of formamide with ethanolamine using the time domain technique

A New Model of Dielectric Constant for Binary Solutions

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