Microwave Absorption and Molecular Structure in Liquids. V. Measurement of the Dielectric Constant and Loss of Low-loss Solutions<sup>1</sup>

Heston, William M.; Franklin, A.D.; Hennelly, E.J.; Smyth, Charles P.

doi:10.1021/ja01164a033

Cited by 104 publications

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“…Using standard standing wave microwave techniques and following the method of Heston et al [11], the dielectric constant (ε ) and dielectric loss (ε ) of the dilute solutions of NMA, EtOH and (NMA + EtOH) binary mixtures at 25 • C were calculated and are given in Table 1.…”

Section: Resultsmentioning

confidence: 99%

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Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Kumar

Rangra

Sharma

et al. 2007

Zeitschrift Für Naturforschung A

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Using standard standing wave microwave X-band techniques, and by following Gopala Krishna's single frequency (9.90 GHz) concentration variational method, the dielectric relaxation times (τ) and dipole moments (µ) of binary mixtures of different molar concentrations of ethanol (EtOH) in binary mixtures of N-methylacetamide (NMA) and ethanol in benzene solutions at 25, 30, 35 and 40 • C have been calculated. The activation parameters (∆H ε , ∆F ε , ∆S ε ) for the dielectric relaxation process of binary mixtures containing 30 mol% of EtOH have been calculated at 25, 30, 35 and 40 • C and compared with the corresponding viscosity parameters. A good agreement between the free energy of activation from these two sets of values shows that the dielectric relaxation process, like the viscous flow, can be treated as a rate process. From relaxation time behaviour of NMA and EtOH binary mixtures in benzene solution, solute-solute and solute-solvent types of the molecular association have been predicted.

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Section: Resultsmentioning

confidence: 99%

“…A set of dilute solutions of the binary mixtures in the benzene solution was made. Using the microwave techniques of Heston et al [11], the dielectric constant (ε ) and the dielectric loss (ε ) of the dilute solutions were calculated. The temperature of the solution was controlled by circulating thermostated water around the dielectric cell.…”

Section: Methodsmentioning

confidence: 99%

Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Kumar

Rangra

Sharma

et al. 2007

Zeitschrift Für Naturforschung A

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“…The X-band microwave bench was used to measure wavelength in the dielectric medium and voltage standing wave ratio (VSWR) using a short circuiting plunger. The dielectric constant (ε') and dielectric loss (ε") was calculated by the method of Heston et al 16 . Dielectric relaxation time of molecular entities in benzene solution was calculated using single frequency concentration variation method of Gopala Krishna 17 .…”

Section: Methodsmentioning

confidence: 99%

“…The dielectric constant (ε') and dielectric loss (ε") have been calculated by the method of Heston et al 16 using the following relations:…”

Section: Theorymentioning

confidence: 99%

Study of Dielectric Relaxation Time and Thermodynamic Parameters in Some Polar Molecules in dilute solution of Benzene

Singh¹

2017

jusps-B

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Present communication reports the experimental values of the dielectric relaxation time () of 4 Methoxyaniline, 4 Ethoxyaniline, 2 Nitroaniline, 2 Chloro, 4 Nitroaniline, 2,6 Dichloroaniline and 2 Methoxy, 3 Nitroanilinein dilute solution of benzene at wavelength 3.13 cm in the microwave region. The measurements have been made at 293, 303 and 313 0 K, in order to calculate the free energy of activation for dipole orientation process (F). The experimental values of have been correlated with the calculated value of obtained using different theories of dielectric relaxation time (  ). It is concluded from this comparative study that the Murty equation is a better representation of the dielectric relaxation phenomenon. Thermo dynamical parameters like molar free energy of activation (F), molar enthalpy of activation (H) and molar entropy of activation (S) have been evaluated by considering the relaxation as the rate process. From the values of F  for the various compounds investigated conclusion has been made that energy of activation increases with the size of molecule.

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“…The liquid dielectric cell was attached at the end of microwave bench. The Smyth's equations [6], [7] are used to calculate dielectric constant, dielectric losses at microwave frequency. …”

Section: Methodsmentioning

confidence: 99%

Dielectric Relaxation of Polar Molecules in Benzene Medium at Microwave

Gedam¹,

Suryavanshi²

2013

IJAPM

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Abstract-The dielectric constant (ε') and loss(ε")of polar liquids in solutions of benzene have been determined at room temperature (270C)at fixed microwave frequency (10.15 GHz). It is observed that dielectric constant and loss varies with concentration linearly. The studies report a determination of relaxation time (τ) electric dipole moment (µ) of Polar liquids in benzene solution at room temperature.

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Microwave Absorption and Molecular Structure in Liquids. V. Measurement of the Dielectric Constant and Loss of Low-loss Solutions¹

Cited by 104 publications

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Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Study of Dielectric Relaxation Time and Thermodynamic Parameters in Some Polar Molecules in dilute solution of Benzene

Dielectric Relaxation of Polar Molecules in Benzene Medium at Microwave

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Microwave Absorption and Molecular Structure in Liquids. V. Measurement of the Dielectric Constant and Loss of Low-loss Solutions1

Cited by 104 publications

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Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Dielectric Relaxation Studies of Mixtures of N-Methylacetamide and Ethanol in Benzene Solutions Using Microwave Absorption Technique

Study of Dielectric Relaxation Time and Thermodynamic Parameters in Some Polar Molecules in dilute solution of Benzene

Dielectric Relaxation of Polar Molecules in Benzene Medium at Microwave

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Microwave Absorption and Molecular Structure in Liquids. V. Measurement of the Dielectric Constant and Loss of Low-loss Solutions¹