Dielectric relaxation and related studies of 4-ethylphenol-methanol mixtures using time domain reflectometry

Fattepur, R. H.; Hosamani, Mohan T.; Deshpande, D. K.; Patil, R. L.; Mehrotra, S. C.

doi:10.1007/bf02898210

Cited by 16 publications

(5 citation statements)

References 11 publications

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“…However, if the number of repeat units of EGO is two or less, the mixtures show a broad and asymetric relaxation curve. For small molecules,22–25, 33, 34 the relaxations are explained well by the Davidson–Cole equation44 and also by the Havriliak–Negami equation 45. The shape of the dielectric relaxation curves of small molecule–water mixtures also changes with temperature and concentration of the solute–water mixture.…”

Section: Resultsmentioning

confidence: 77%

“…The behaviour of binary systems formed by a macromolecule and small solvent molecules, is influenced by preferential adsorption of one component on the macromolecular coil, which can cause variation of the unperturbed dimensions of the polymer. The dielectric behaviour of the association of small molecules and macromolecules in water mixtures has been studied by several workers22–34 over a frequency range 10 6 –10 10 Hz using time domain reflectometry (TDR). These studies were performed to understand the structure and dynamics of water, solute and solute–solvent interactions.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric dispersion studies of poly(vinyl alcohol) in aqueous solutions

Sengwa

Kaur

2000

Polym. Int.

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Section: Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Dielectric dispersion studies of poly(vinyl alcohol) in aqueous solutions

Sengwa

Kaur

2000

Polym. Int.

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“…Prior to the measurements, the coaxial cable and the frequency analyzer were calibrated with three references, air, methanol, and ethanol. The dielectric properties of the references [3,[18][19][20][21] were listed in Table 2. The uncertainty for the mole fraction of DME was the same as that in the density measurement, u(x1) = 0.01.…”

Section: Measurement Of Dielectric Spectramentioning

confidence: 99%

Volumetric and Dielectric Properties in Liquid Phase of Dimethyl Ether–Ethanol at (293.2–313.2) K and 1.00 MPa

Hoshina,

Sato,

Okada

et al. 2023

J Solution Chem

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Density and dielectric spectra were investigated in liquid phase of dimethyl ether (DME) -ethanol by an oscillating U-tube densimeter and a complex dielectric spectrometer under 1.00 MPa. The density was measured at 303.15 and 313.15 K, and converted to the excess molar volume. The excess molar volumes were no smaller than -0.880 and -0.909 cm 3 mol -1 at 303.15 and 313.15 K, respectively. The mole fraction dependence can be correlated with Redlich-Kister equation, whose minimum was found around 0.58 for the mole fraction of DME.The dielectric constant and the dielectric relaxation time were evaluated form the complex dielectric spectra in the frequency range from 0.5 to 18 GHz at (293.2-313.2) K and 1.00 MPa.The dielectric constants and the relaxation time were decreased with the mole fraction of DME, and the latter tended to be around 25 ps in the range of mole fraction higher than 0.6. The logarithmic dielectric constants can be correlated with a similar function to Hildebrand equation with the volume fraction. The effective Kirkwood g-factor was evaluated at 293.2-313.2 K and 1.00 MPa. The g-factors were given by two liner functions crossed around 0.6 for the mole fraction of DME. Considering an atomic composition (C2H6O), the molecular sizes are not so different for DME and ethanol. Then, the solution structure was thought to be microscopically changed around 0.6 for the mole fraction of DME. The mole fraction will be utilized to switch the solubility for an extraction of amphipathic compounds.

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“…The dielectric studies on aromatic molecules have been reported from our laboratory earlier [1][2][3][4][5][6][7][8] and others , as dielectric approach forms one of the powerful tools for the determination of molecular structure [9]. For example, in the case of some derivatives of sydnones rather high values of electric dipole moments could be explained in a satisfactory way by assigning cyclic meso-ionic structures rather than an improbable bicyclic structure.…”

Section: Introductionmentioning

confidence: 98%

Dielectric studies on some mesogenic, non-mesogenic and organic molecules

Sannaninganavar¹,

Ayachit

Deshpande

2009

Physics and Chemistry of Liquids

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Two important molecular parameters, namely, the dielectric relaxation time and electric dipole moment are highly useful in having insight into the molecular structure, size, shape, apart from the inter-and intra-molecular forces, etc. With these in view dielectric measurements in benzene at room temperature on the pure samples of o-ethyl phenol, 2-n-butylphenol, 4-n-butylphenol, 2,6-dimethoxyphenol and 3,4-difluorophenol were carried out at a frequency of 9.98 GHz by employing concentration variation method. Similar measurements, on a single weight fraction of each of them at 9.98 GHz and also at 8.74 GHz are carried out. Measurements on a single weight fraction in benzene of each of the liquid crystal samples, namely, EPCP.car (Butyl-p-(p-ethoxy phenoxy corbonyl)-phenyl carbonate), PPPB (p-pentylphenyl-p-propyl benzonate), EPAP.Hp (p-(p-ethoxyphenyl azo) phenyl heptenate) and EPAP. Und (p-(p-ethoxyphenyl azo) phenyl undecylenate were also carried out at the said two frequencies. Using the obtained values of " 0 , " 00 relaxation time and dipole moment were determined using different methods. The obtained results are compared with earlier results wherever available.

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Dielectric relaxation and related studies of 4-ethylphenol-methanol mixtures using time domain reflectometry

Cited by 16 publications

References 11 publications

Dielectric dispersion studies of poly(vinyl alcohol) in aqueous solutions

Dielectric dispersion studies of poly(vinyl alcohol) in aqueous solutions

Volumetric and Dielectric Properties in Liquid Phase of Dimethyl Ether–Ethanol at (293.2–313.2) K and 1.00 MPa

Dielectric studies on some mesogenic, non-mesogenic and organic molecules

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