Dielectric and excess dielectric constants in non polar+polar binary liquid mixtures of toluene with alcohols at 303, 313 and 323K

Ramana, Ch. V. V.; Kumar, Ashwani; Kumar, Ajay; Kumar, Munish; Moodley, M.

doi:10.1016/j.tca.2013.05.022

Cited by 28 publications

(13 citation statements)

References 19 publications

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“…The dielectric constant is an important property that plays an important role in the characterization of material electrical properties [36]. The dielectric constant (permittivity) e Ã can be considered as a complex quantity and is given by…”

Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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The synthesized Schiff base ligand 8-hydroxyquinoline-7-formylidene-4-amino-1-phenyl-2,3-dimethylpyrazolin-5-one (SQL) and its Cu(II), VO(IV) and UO 2 (II) complexes are characterized by various physicochemical techniques. The thermal properties, dielectric properties, alternating current conductivity (r ac ) and conduction mechanism of SQL and its complexes (1-6) are investigated in the frequency range of 0.1-100 kHz and temperature range 298-583 K. The temperature and frequency dependence of the real and the imaginary part of the dielectric constant are studied. The values of the thermal activation energy of conduction mechanism for SQL and its complexes under investigation are calculated at different test frequencies, and found to be in the range 0.0023-0.0798 eV for DE 1 and 0.0897-1.296 eV for DE 2 . The ac conductivity, r ac , is related to the frequency as r ac a x S where the behavior of the exponent S with temperature determines the operating conduction mechanism. The correlated barrier hopping model is found to be the dominant conduction mechanism for SQL and its complexes (1) and (3-5), and the values of the maximum barrier height (W m ) are calculated for SQL and its complexes (1) and (3-5). The quantum-mechanical tunneling is the dominant conduction mechanism for complexes (2) and (6).

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Section: Temperature and Frequency Dependence Of Dielectric Constant mentioning

confidence: 99%

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

et al. 2015

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“…Excess parameters. The general formula for calculating the excess parameters [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] is given below…”

Section: Discussionmentioning

confidence: 99%

Microwave dielectric relaxation & polarization study of binary mixture of methylethylketone with nitrobenzene

Maharolkar¹,

Murugkar²,

Khirade³

et al. 2019

Bull. Chem. Soc. Eth.

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Present paper reveals detailed study of dielectric relaxation and dielectric polarization and physicochemical study of binary polar-polar liquid mixture i.e. dielectric constant, relaxation time, viscosity, density of methylethylketone (MEK) with nitrobenzene (NB) at 303 K. The measured dielectric and physicochemical parameters employed to acquire additional derived properties like Bruggeman factor, molar refraction and excess properties like static dielectric constant, excess inverse relaxation time, excess molar volume, excess viscosity, excess molar refraction, Gibbs free energy, and enthalpy of activation. The variation of this parameters with composition of these quantities has been used to explain the type, strength and nature of intermolecular interactions between MEK+NB binary mixture. Attained results authenticate that there are strong hydrogen-bond interactions between unlike molecules of different groups of MEK+NB mixtures and that 1:1 complexes are produced and strength of intermolecular interaction rises with rise in concentration of MEK.

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“…To estimate the change in the relative permittivity of the mixture if the relative permittivity of one component changes, we used theoretical models. Out of several available theoretical models, we studied and compared the models by Kraszewski, Bottcher-Bordewijk, Looyenga, Peon-Iglesias, and Lichtenecker-Rother [7,26,27]. All of these models express the effective relative permittivity of a mixture of two liquids in terms of their values of relative permittivity (ε 1 and ε 2 ) and their volume fractions (φ 1 and φ 2 = 1 − φ 1 ).…”

Section: Detection Of Changes In Mixture Of Liquidsmentioning

confidence: 99%

“…As we need the models only to estimate the relative change in the relative permittivity of the mixture if the relative permittivity of one of the components changes, we give theoretical expressions for the relative permittivity only for these two models. Within the model by Kraszewski [7,26], the relative permittivity of the mixture is given by…”

Section: Detection Of Changes In Mixture Of Liquidsmentioning

confidence: 99%

“…However, most often, electrodes are connected to the complementary metal-oxide semiconductor (CMOS) chip [3][4][5] and a voltage signal is measured. Capacitive sensors are also used to detect concentrations of mixed liquids in pharmacy and medicine [6] as well as the dielectric properties of alcohols, which are of a special interest in chemical and electrochemical processes and thus very important in chemistry and biology [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Highly Sensitive Quartz-Based Sensing System for the Detection of Subpercentage Changes in the Relative Permittivity of Liquids Flowing in Microchannels

Matko

Milanovič

2021

Chemosensors

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We describe a highly sensitive quartz sensor for measuring changes in the relative permittivity of liquids flowing in microchannels. The proposed method uses a highly stable oscillator and capacitance-dependent quartz crystal together with a capacitance-sensitive element attached along the microchannel. A change in the relative permittivity of the fluid induces a change in the capacitance of the sensitive element in the aF range, which is detected as a change in the resonant frequency. The advantages of the proposed measurement technique are the extreme sensitivity (changes in the relative permittivity as low as 0.01% can be detected), the temperature independence of the setup between 10 and 40 °C, the stability (the frequency reading fluctuates within 0.025 Hz), and the low cost compared with the methods that use impedance analyzers or lock-in amplifiers. We present the use of the method to detect changes in mixtures of liquids if the temperature, volume fractions, or properties of one liquid change. The method presents a useful tool for applications in biology, chemistry, pharmacy, and technology in general wherever accurate monitoring of compositions of fluids is required and where changes, for example, due to temperature variation or mixture aging, need to be detected in real time.

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Dielectric and excess dielectric constants in non polar+polar binary liquid mixtures of toluene with alcohols at 303, 313 and 323K

Cited by 28 publications

References 19 publications

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Dielectrical properties and conduction mechanism of quinoline Schiff base and its complexes

Microwave dielectric relaxation & polarization study of binary mixture of methylethylketone with nitrobenzene

Highly Sensitive Quartz-Based Sensing System for the Detection of Subpercentage Changes in the Relative Permittivity of Liquids Flowing in Microchannels

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