scholarly journals Comparative Dielectric Study of Binary Mixtures of Coriandar oil and Radish oil

2021 ◽  
Vol 37 (2) ◽  
pp. 308-313
Author(s):  
Mohammad Shafi Khan ◽  
Vishal Singh Chandel ◽  
Satyendra Pratap Singh
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Binary Mixtures ◽  
Dielectric Study ◽  
Dielectric Parameters ◽  
Temperature Controller ◽  
Different Temperatures

The present paper deals with the dielectric study (dielectric constant, dielectric loss) of two medicinal oils, coriandar and radish oil and their binary mixtures at different temperatures and frequencies. HP 4194A impedance gain/phase analyzer and temperature controller (Julabo, model number F-25, microprocessor controlled) were used for determination of dielectric parameters and maintaining the temperature of pure oils their binary mixtures.

Dielectric Study of Carboxyl (–COOH) Functionalized Multi-Walled Carbon Nano Tube-Silicone Oil Nanofluids at Different Temperatures

2019 ◽  
Vol 17 (12) ◽  
pp. 982-986
Author(s):  
M. Premalatha ◽  
N. Preetha ◽  
S. Padmavathi ◽  
A. Kingson Solomon Jeevaraj
Keyword(s):  
Dielectric Constant ◽  
Dipole Moment ◽  
Silicone Oil ◽  
Dielectric Study ◽  
Dielectric Parameters ◽  
Entire Concentration Range ◽  
Molar Polarization ◽  
Different Temperatures ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this work, dielectric properties of carboxyl (–COOH) functionalized MWCNTs-Silicone oil (polydimethylsiloxanes) nanofluids have been studied at static frequency. Purchased carboxyl (–COOH)-f-multi-walled carbon nanotubes (MWCNTs) are purchased and characterized using transmission electron microscopy (TEM) technique. Carboxyl (–COOH)-f-MWCNT-Silicone oil nanofluids are prepared by dispersing COOH-MWCNT in Silicone oil (base fluid) with the help of probe sonicator. At various concentrations and at different temperatures dielectric parameters like static dielectric constant (ɛ0), excess dielectric constant (ɛE), dipole moment (μ), excess dipole moment (μE) and molar polarization (P) have been determined for COOH-f-MWCNT-Silicone oil nanofluids. The changes in the dielectric parameters with respect to five different concentrations and various temperatures (303 K to 323 K) are analyzed in the presence of intermolecular interactions happening in the COOH-f-MWCNT-Silicone oil nanofluid system. Excess dielectric constant and excess dipole moment values are found to be negative over entire concentration range of COOH-MWCNTs at every different temperature.

scholarly journals Growth, Optical and Dielectric Studies on Pure and L-Lysine Doped KDP Crystals

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
N. Kanagathara ◽  
G. Anbalagan
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Single Crystals ◽  
Visible Region ◽  
Point Of View ◽  
Dielectric Study ◽  
Dielectric Studies ◽  
Slow Evaporation ◽  
Application Point ◽  
Kdp Crystals

Optically good quality single crystals of pure and L-lysine monohydrochloride-doped KDP crystals have been grown by a slow evaporation method. The grown crystals have been subjected to optical and dielectric studies. The UV-Vis spectrum shows the transmitting ability of the crystals in the entire visible region and transmittance percentage is increased for the doped KDP crystals. From the dielectric study, it is found that the dielectric constant and the dielectric loss of L-lysine-doped KDP crystals were lower than the pure KDP crystals. Hence L-lysine-doped KDP crystals are found to be more beneficial from an application point of view as compared to pure KDP crystals.

Effect of Fungicide Treatment on Dielectric Properties of a Vegetable Seed

2015 ◽  
Vol 5 (2) ◽  
Author(s):  
Vishal Singh Chandel ◽  
Atiq UR Rahmanm ◽  
J. P. Shukla ◽  
Rajiv Manohar ◽  
Mohd. Shafi Khan
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Moisture Content ◽  
Considerable Change ◽  
Frequency Range ◽  
Dielectric Parameters ◽  
Hewlett Packard ◽  
Fungicide Treatment ◽  
Vegetable Seed

Effect of fungicides' (thiram, captan, carbendazim, bagalol) treatment on dielectric constant and dielectric loss of a vegetable seed, namely the brinjal at given moisture content and bulk density was examined using Hewlett-Packard (HP-4194A) impedance/gain phase analyzer over the frequency range of 0.01 to 10 MHz and temperature range of 30-450C. Julabo (temperature controller, F-25, Germany) was used for keeping the temperature of seeds constant. Study showed that fungicide treatment cast considerable change in dielectric parameters namely the dielectric constant and dielectric loss.

scholarly journals On the direct determination of the electrostatic moments of molecules

1929 ◽  
Vol 124 (795) ◽  
pp. 689-698 ◽  
Keyword(s):  
Dielectric Constant ◽  
Direct Determination ◽  
Negative Temperature ◽  
Dielectric Constants ◽  
Temperature Coefficients ◽  
Different Temperatures

According to Faraday's ideas, the specific inductive capacity of a substance is due to the polarisation of the molecules as wholes. This is the basis of the old Clausius-Mosotti theory of dielectrics, on which it is shown first that the polarisation P is proportional to the polarising field, i. e. , P = k E, k being the dielectric constant, and second that δ being the density of the dielectric, k - 2/ k + 2 ·1/δ = constant. Now it is known that some substances have large negative temperature coefficients for their dielectric constants which cannot thus be accounted for. To provide for this Debye proposed the theory that the molecules were permanently polarised and that they were systematically orientated in the field. This leads to the equation k - 2/ k + 2 = a T -1 + b T -2 , to represent the change of specific inductive capacity with temperature. This theory has been developed by Gans and others, and a number of measurements have been made by Smyth and others, who have found the molecular moments of many substances by measuring the dielectric constants at different temperatures.

scholarly journals Study of Dielectric Properties of Fenugreek Seeds (Trigonella Foenum Graecum)

2014 ◽  
Vol 66 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Mohd. Shafi Khan ◽  
Vishal Singh Chandel ◽  
Rajiv Manohar ◽  
Jagdeesh Prasad Shukla
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Moisture Content ◽  
Ac Conductivity ◽  
Frequency Range ◽  
Fenugreek Seeds ◽  
Temperature Controller ◽  
Trigonella Foenum Graecum ◽  
Fenugreek Seed

Abstract The present paper studied the dielectric constant, dielectric loss, and ac conductivity of fenugreek seed, a medicinal seed (Trigonella foenum graecum), within the frequency range of 10 kHz and 10 MHz and the temperature range of 30°C and 50°C. Impedance gain/phase analyser (HP 4194 A) was used to measure the dielectric constant and the dielectric loss and Julabo (temperature controller, F-25, Germany) was used for keeping the temperature of fenugreek seeds constant. It was found that the dielectric constant and the dielectric loss decrease with the increase in the frequency while the same increase with the increase in temperature and moisture content. The ac conductivity increased with the increase in frequency, moisture and temperature.

GROWTH AND CHARACTERIZATION OF BIS-THIOUREA STRONTIUM CHLORIDE SINGLE CRYSTALS

2010 ◽  
Vol 24 (08) ◽  
pp. 735-747 ◽  
Author(s):  
R. R. HAJIYANI ◽  
D. J. DAVE ◽  
C. K. CHAUHAN ◽  
P. M. VYAS ◽  
M. J. JOSHI
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Single Crystals ◽  
Applied Field ◽  
Dielectric Study ◽  
Solubility Curve ◽  
Strontium Chloride ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Aqueous Solvent

Bis-thiourea strontium chloride was synthesized and single crystals were grown by the slow solvent evaporation technique using aqueous solvent. The solubility curve was obtained and the determination of the induction period as well as the evaluation of kinetic parameters of nucleation was carried out. The powder XRD analysis suggested orthorhombic crystal structure. The FT-IR spectrum confirmed the presence of various functional groups. The thermo-gravimetry analysis was carried out and the crystals were found to be stable up to 170°C. Applying Coats and Redferm relation to the thermo-gram, the kinetic and thermodynamic parameters of dehydration were calculated. The dielectric study was carried out in the frequency range of applied field from 500 Hz to 1 MHz. The variations of dielectric constant, dielectric loss, AC resistivity and AC conductivity were studied with frequency. It was found that the dielectric constant and the dielectric loss decreased as the frequency of applied field increased, whereas the AC resistivity increased as the frequency increased.

scholarly journals Effects of additional amount of carbon micro-coils on the dielectric properties of its composite sheet

2014 ◽  
Vol 38 (1) ◽  
pp. 39-47
Author(s):  
Meherun Nessa
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Relative Dielectric Constant ◽  
Loss Angle ◽  
Composite Sheet ◽  
Dielectric Parameters ◽  
Dielectric Loss Angle ◽  
Additional Amount ◽  
Academy Of Sciences

The morphology and dielectric properties of carbon micro-coils (CMC) composite sheet wereexamined. Frequency dependence of dielectric parameters; dielectric loss angle (?), dielectric losstangent (tan?) and relative dielectric constant ( ?r) were measured on single and double-helixcomposite sheet. It was found that these parameters of CMC/polysilicone composites extensivelychanged with the additional amount of CMC with polysilicone resine. It was also observed that thehigher additional amount (wt%) of CMC is appropriate for high response. DOI: http://dx.doi.org/10.3329/jbas.v38i1.20210 Journal of Bangladesh Academy of Sciences, Vol. 38, No. 1, 39-47, 2014

scholarly journals Detection of biodegradation degree of sludge using dielectric measurement

2018 ◽  
Vol 6 (1-2) ◽  
pp. 108-112
Author(s):  
Sándor Beszédes ◽  
Katalin Papp-Sziládi ◽  
Gábor Keszthelyi-Szabó ◽  
Cecília Hodúr
Keyword(s):  
Dielectric Constant ◽  
Organic Matter ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Loss Factor ◽  
Dielectric Loss Factor ◽  
Dielectric Measurement ◽  
Energetic Efficiency ◽  
Dielectric Parameters ◽  
Polymeric Structure

Pre-treatments applied before biological sludge utilization technologies aim to modify the sludge structure for enhanced disintegration degree and biodegradability. Among the thermal pre-treatments methods, microwave irradiation is suitable to degrade the polymeric structure of sludge, and to increase the solubility of organic matters. Energetic efficiency of microwave heating is mainly determined by the dielectric properties, such as dielectric constant and dielectric loss factor. Dielectric properties are influenced by the frequency, temperature; composition and consistency of irradiated material, state and bond of water etc. Therefore, physicochemical changes of sludge structure; e.g. hydrolysis of macromolecules, degradation of cell wall of microorganisms, aggregation of particles; contribute to the change of dielectric parameters, as well. In our work we investigated the correlation between the dielectric parameters and structural change and biodegradability indicators. In the case of municipal wastewater, the change of organic matter removal efficiency during wastewater purification technology at a wastewater treatment plant can be detected by the change of dielectric constant. Results related to sludge processing show, that change of organic matter solubility and aerobic biodegradability correlate the change of dielectric loss factor and dielectric constant. With the degradation of polymeric structure of sludge matrix and decomposition of macromolecules caused by thermal effects or chemical pre-treatments led to increased mobility of ions and enhanced polarization of molecules. These effects led to increased dielectric constant and loss factor, what make possible to pre-indicate the efficiency of sludge pre-treatment processes by an in line and real time measurement method.

scholarly journals Microwave Dielectric Study of Tetramethylurea andN, N-Dimethylacetamide Binary Mixture in Benzene

2011 ◽  
Vol 8 (3) ◽  
pp. 1378-1386
Author(s):  
V. Sharma ◽  
N. Thakur
Keyword(s):  
Dielectric Constant ◽  
Binary Mixture ◽  
Dielectric Relaxation ◽  
Benzene Solution ◽  
Microwave Frequency ◽  
Single Frequency ◽  
Rate Theory ◽  
Dielectric Study ◽  
Frequency Method ◽  
Dielectric Parameters

Dielectric relaxation of the binary mixture of tetramethylurea andN, N-dimethylacetamide has been studied at fixed frequency and temperature (9.88 GHz & 298 K respectively) in benzene solution. Different dielectric parameters like the dielectric constant (ε') and the dielectric loss (ε") at microwave frequency, static dielectric constant (ε0) and dielectric constant (ε∞) at optical frequency were determined. The values of relaxation time (τ(1), τ(2), τ(0)& τGK) have been calculated using higasi’s single frequency method and Gopala Krishna’s method. Using Eyring’s rate theory, the activation energies for the process of dielectric relaxation and viscous flow were calculated and compared. The study of dielectric properties of the binary mixture reveals the existence of the solute-solute type of molecular associations.

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