The excess parameter studies in the microwave frequency region (X-band) on complex dielectric permittivity for the binary mixtures are reported. The methods employed are fixed cavity perturbation technique and adjustable plunger cavity technique. Also Gopalakrishna method is used to calculate the relaxation time of the polar solute in a non-polar solvent. The samples under study are acetonitrile, chlorobenzene, dimethyl formamide, carbon tetrachloride and benzene. © 1993 the Indian Academy of Sciences.

Venkatachalam Subramanian

Department Of Physics

Jandhyala Sobhanadri

acetonitrile

Chemical operations

ELECTRIC BREAKDOWN OF LIQUIDS

MICROWAVE CIRCULATORS

Parameter estimation

Permittivity measurement

Perturbation techniques

Refractive index

Relaxation processes

Spectroscopic analysis

Thermodynamic properties

Volume measurement

ADJUSTABLE PLUNGER CAVITY TECHNIQUE

Binary mixtures

CHLOROBENZENE BINARY MIXTURES

DIMETHYL FORMAMIDE

EXCESS DIELECTRIC PARAMETER

FIXED CAVITY PERTURBATION TECHNIQUE

GOPALAKRISHNA METHOD

LIQUID BONDING

Relaxation time

DIELECTRIC PROPERTIES OF LIQUIDS

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Dielectric studies of some binary liquid mixtures using microwave cavity techniques

Pramana

The molecular interaction between the polar systems of isobutanol and aniline for various mole fractions at different temperatures were studied by determining the frequency dependent complex dielectric permittivity by using the open-ended coaxial probe technique method in the microwave frequency range from 20 MHz to 20 GHz. The geometries are optimized at HF and B3LYP with 6-31G and 6-31G+ basis sets. Dipole moments of the binary mixtures are calculated from the dielectric data using Higasi's method and compared with the theoretical results. Conformational analysis of the formation of hydrogen bond between the isobutanol and aniline is supported by the FT-IR and molecular polarizability calculations. The average relaxation times are calculated from their respective Cole-Cole plots. The activation entropy, activation enthalpy and Kirkwood correlation 'g' factor, excess permittivities E), Bruggeman parameters (fB) have also been determined for isobutanol and aniline and the results were correlated. © 2012 Elsevier B.V. All rights reserved.

Journal of Molecular Structure

Microwave dielectric relaxation studies of hydrogen bonded polar binary mixtures of isobutanol and aniline

The dielectric behaviour of the polar liquids like propionaldehyde, isopropyl amine and their equimolar binary mixture in nonpolar solvent benzene is studied in the microwave frequency range using the cavity perturbation technique at 6.218 GHz (J band), 9.880 GHz (X band), 16.331 GHz (P band) and 24.951 GHz (K band). Hamiltonian quantum mechanical calculations such as AM1, PM3, and MNDO optimized converged geometry operation is performed by using Argus lab chemical modelling software 2004 for both pure and binary systems of propionaldehyde and isopropyl amine. Dipole moments of the binary mixtures are calculated from the dielectric data using Higasi's method and compared with the theoretical results. Conformational analysis of the formation of a hydrogen bond between the propionaldehyde and isopropyl amine is supported by FT-IR, proton NMR spectra and molecular polarizability calculations. The average relaxation times are calculated from their respective Cole-Cole plots.

Molecular Physics

Conformational and microwave dielectric relaxation studies of hydrogen bonded polar binary mixtures of propionaldehyde with isopropyl amine

The dielectric behavior of the polar liquids like propan-1-ol, isopropyl amine and their equimolar binary mixture in nonpolar solvent benzene is studied in the microwave frequency range using the cavity perturbation technique at 6.218 GHz (J band), 9.880 GHz (X band), 16.331 GHz (P band) and 24.951 GHz (K band). Hamiltonian quantum mechanical calculations such as AM1, PM3, and MNDO optimized converged geometry operation is performed by using Argus lab chemical modeling software 2004 for both pure and binary system of propan-1-ol and isopropyl amine. Dipole moments of the binary mixtures are calculated from the dielectric data using Higasi's method and compared with the theoretical results. Conformational analysis of the formation of hydrogen bond between the propan-1-ol and isopropyl amine is supported by the FT-IR and proton NMR spectra. The average relaxation times are calculated from their respective Cole-Cole plots. © 2008.

Conformational and dielectric analysis of hydrogen bonded polar binary mixtures of propan-1-ol with isopropyl amine

The dielectric behaviour of polar liquids such as propan-1-ol, propionaldehyde and their equimolar binary mixture in non-polar solvent benzene is studied in the microwave frequency range using the cavity perturbation technique at 6.218 GHz (J band), 9.880 GHz (X band), 16.331 GHz (P band) and 24.951 GHz (K band). Ab initio geometry optimization is performed in the 6-31G (d) basis set using the Gaussian 94W program for both pure and binary systems of propan-1-ol and propionaldehyde. Dipole moments of the binary mixtures are calculated from the dielectric data using Higasi's method and compared with the ab initio results. Conformational analysis of the formation of hydrogen bond between the propan-1-ol and propionaldehyde is supported by the FT-IR spectra. The average relaxation times are calculated from their respective Cole-Cole plots.

Conformational and dielectric analysis of hydrogen bonded polar binary mixtures of propan-1-ol with propionaldehyde

The dielectric behaviour of polar liquids like isobutanol, tertiary butyl amine and their equimolar binary mixture in nonpolar solvent benzene is studied in the microwave frequency range using the cavity perturbation technique at 6.218 GHz (J band), 9.880 GHz (X band), 16.331 GHz (P band) and 24.951 GHz (K band). Hamiltonian quantum mechanical calculations such as AM1, PM3 and MNDO optimized converged geometry operation is performed on isobutanol, tertiary butyl amine and their equimolar binary mixtures using Argus lab chemical modelling software, 2004. Dipole moments of the binary mixtures are calculated from the dielectric data using Higasi's method, and compared with the theoretical Hamiltonian quantum mechanical results. Conformational analysis of the formation of hydrogen bond between the isobutanol and tertiary butyl amine is supported by FT-IR and proton NMR spectra. The average relaxation times are calculated from their respective Cole-Cole plots.

Microwave dielectric absorption studies of hydrogen bonded polar binary mixtures of isobutanol with tertiary butyl amine

A new technique, based on the cavity resonance, of measuring the complex dielectric permittivity of liquid samples is described in detail. The errors in the measurement of the real and imaginary parts of the complex dielectric permittivity are ∼±1% and ±3%, respectively. The complex dielectric permittivity values measured using this method for some standard liquids are also presented. A comparison is made between the present values and the values obtained using standard techniques.

Fulltext

Review of Scientific Instruments

A new technique of measuring the complex dielectric permittivity of liquids at microwave frequencies

To derive the expression for complex dielectric and magnetic susceptibilities, an easy and alternate approach is proposed. This analysis is based on the assumption that the cavity is equivalent to an isolated lumped resonant circuit. The results are identical with standard expressions. Results of a few samples are also tabulated. © 1989.

Solid State Communications

A method for the evaluation of microwave dielectric and magnetic parameters using rectangular cavity perturbation technique

Journal	Data powered by TypesetPramana
Publisher	Data powered by TypesetSpringer India
ISSN	03044289
Open Access	No