Dielectric dispersion and thermodynamic behavior of stearic acid binary mixtures with alcohol as co-solvent using time domain reflectometry

Sylvester, M. Maria; Ganesh, T.; Karunakaran, D.; Senthilkumar, P.; Hudge, P. G.; Kumbharkhane, A.C.

doi:10.1142/s2010135x17500278

Cited by 13 publications

(3 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…∆S increases spontaneously in favor of molecular movement. The negative value of enthalpy and positive value of entropy signify that molecular dipoles are spontaneously aligned and oriented at all temperatures [24].Enthalpy of activation in case of Glycine molecules was positive for β process at room temperature and this may be due to formation of aggregation of liquid between molecules of solute and solvent and for other temperature enthalpy was found negative.…”

Section: E En Nt Tr Ro Op Py Y ( (∆ ∆S S) )mentioning

confidence: 93%

See 1 more Smart Citation

Study of Dielectric and Thermodynamic properties of Aqueous Glycine

Alwaleedy

Mohemmed

Karale

et al. 2022

Preprint

View full text Add to dashboard Cite

Dielectric and thermodynamic properties of aqueous glycine having molecular weight 75.07 g/mol have been studied at different concentrations in the range 0.459 to 1.480 mol/kg in the temperature range of 298.15–278.15 K. Time Domain Reflectometery technique was used in the frequency range of 10 MHz to 30 GHz. Havriliak-Nigami equation was used to analyze the frequency dependence of the complex permittivity spectra. Two relaxation processes have been detected for studied system which requires two Debye relaxation model to describe the complex permittivity spectra 𝛆*(v). The low frequency relaxation process is associated with glycine molecules called β-relaxation while the high frequency relaxation process is associated with water molecules called γ-relaxation. For β –process, relaxation time was observed to be increasing towards lower temperature and higher concentration, which is associated with the rotational motion of glycine molecules in the surrounding of water. Relaxation strength was also observed to be increasing towards low temperature and high concentration, relaxation time and relaxation strength for γ- process was found almost independent of temperature. The study also covers solvation dynamics of glycine through the observed hydration number (Nhyd) and the effective hydration number (Zib). The effective dipole moment has been obtained using Cavell equation in order to see the effect of temperature and concentrations on the dipole moment and ultimately the dielectric constant of the solute molecules. The nature of the molecular interactions in pure liquid and liquid mixtures can be well understood in terms of thermodynamic functions. Thermo dynamical parameters such as molal entropy (∆S), molal enthalpy (∆H) and molal free energy (∆F) in addition to activation entropy, enthalpy and free energies have also been calculated in order to support the obtained dielectric parameters.

show abstract

Section: E En Nt Tr Ro Op Py Y ( (∆ ∆S S) )mentioning

confidence: 93%

“…Relaxation dynamics of binary and ternary mixture of stearic acid on various concentrations have been carried out by Maria Sylvester et .al. [24] through thermodynamic parameters such as enthalpy, entropy and Gibb's free energy. The static dielectric constant, dielectric permittivity and dielectric loss were found by bilinear calibration.…”

Section: Introductionmentioning

confidence: 99%

Study of Dielectric and Thermodynamic properties of Aqueous Glycine

Alwaleedy

Mohemmed

Karale

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…The values of ΔS for EGME-water mixture at different concentrations are also found to be positive and the positive values of entropy suggest the random orientation in solute-solvent complex. 44…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

Dielectric relaxation study of aqueous ethylene glycol mono-methyl ether (EGME) with water using time domain reflectometry technique in the frequency range 10MHz to 50GHz

Khan¹,

Lokhande

Deshmukh

et al. 2020

J. Adv. Dielect.

Self Cite

View full text Add to dashboard Cite

The Complex permittivity spectra of glycol ether (GE) compounds such as ethylene glycol mono-methyl ether (EGME) with water mixture over entire concentration range and in temperature range of 10–25∘C have been determined using Time Domain Reflectometry (TDR) technique in the frequency range 10[Formula: see text]MHz to 50[Formula: see text]GHz. The complex permittivity spectra for EGME-water were fitted in the Cole–Davidson model. The Static dielectric constant ([Formula: see text], Relaxation time ([Formula: see text], effective Kirkwood correlation factor ([Formula: see text], excess permittivity ([Formula: see text], thermodynamic parameters (activation enthalpy and activation entropy) and Bruggeman factor ([Formula: see text] have been calculated by the nonlinear least square fit method. The intermolecular interactions between EGME-water binary mixtures suggest the nonlinear behavior of dielectric parameters. The contribution of hydrogen bonding interactions among the solute–solvent mixtures is confirmed by Excess properties and Bruggeman factor.

show abstract