Thermodynamic and Molecular Dielectric Relaxation Studies of Polar–Polar Binary Mixtures Using Time Domain Reflectometry Technique

Khan

et al. 2022

Mater. Res. Express

Dielectric investigations of hydrogen bonded complexes of Enanthamide and Valeramide with 4-bromophenol, 4-chlorophenol, 4-iodophenol and 4-fluorophenol in benzene were done at 303K, using a J-band (7.22GHz) microwave bench and dielectric relaxation setup. The permittivity of amides with halogenated phenol binary mixtures was measured in the microwave frequency range at temperatures ranging from 298K to 323K. At microwave frequencies; dielectric relaxation of ternary mixes of polar liquids in nonpolar fluids has been explored. Such investigations give useful information about the intermolecular and intramolecular interactions of solutes and solvent molecules. The dipole meter had a measurement frequency of 2MHz. The different parameters of dielectric, relaxation time (τ 0 ) and the dipole moment (μ) has been evaluated using the single-frequency concentration Higasi approach. The fact that the relaxation time and molar free energy activation of the 1:1 molar ratio are greater than those of other higher molar ratios (i.e. 3:1, 2:1, 1:2, 1:3) confirms the presence of a 1:1 complex structure between the studied systems, as well as a complex formation between the free hydroxyl group of phenols and the carbonyl group of amides. The dielectric relaxation energy parameters (ΔFε, ΔHε and ΔSε) of amides with halogenated phenols in benzene have been computed and compared with the related viscosity parameters. A comparison of these two sets of characteristics reveals that dielectric relaxation, like viscous flow, may be thought of as rate process.

Section: Resultssupporting

confidence: 66%

Dielectric relaxation and dipole moment studies of hydrogen bonded complexes for enanthamide and valeramide with halogenated phenols using J-band microwave frequency

Khan

et al. 2022

Mater. Res. Express

“…Molecular interaction dependes the physical and chemical properties of the liquid system which consists of ploar and non polar molecules [1][2][3] . Time domain reflectometry is one of the useful techniques to identify the nature of interactions of a liquid system.…”

Section: Introductionmentioning

confidence: 99%

Intermolecular Interaction Studies of Binary Liquid Mixtures Using Time Domain Reflectometry at 303K Sampandam Elangovan and Yilak Alemu Abbo

2018

IJCTR

: Intermolecular interactions of propylformate with 1-methanol, 1-ethanol and 1-propanol have been studied at micro frequency range 9.36 GHz at 303K. Dielectric constant, dielectric losses were determined. Relaxation time was calculated using Higasi and Cole-Cole method. Dielectric constant and Relaxation time decreased while concentration of alcohols in propyl formate system. Strength of dissociation of liquid mixtures was based on the carbon chain length of alcohols with propyl formate which was in the order of 1-methanol<1-ethanol<1-propanol.

“…In our study, the excess inverse relaxation time (1/τ) E values are negative for all the systems such as TEA with 2-ME, 2-EE and 2-BE binary mixtures. This indicates that the addition of TEA with 2-Alkoxyethanols has created a hindering field such that the effective dipoles rotate slowly [41].…”

mentioning

confidence: 99%

Dielectric Relaxation Studies of Triethanolamine with 2-Alkoxyethanol using time Domain Reflectometry Technique

Kumar¹,

Amalanathan²

2019

IJSRPAS

The dielectric relaxation studies of Triethanolamine with 2-Alkoxyethanols binary liquid mixtures have been determined over the frequency range of 10 MHz to 20 GHz at different concentrations using Time Domain Reflectometer (TDR) Technique at 303.15K. The dielectric permittivity (ε') and dielectric loss (ε") has been plotted in the dielectric complex plane. The static dielectric constant (ε 0 ), dielectric constant at high frequency (ε ∞ ), and relaxation time (τ) values are calculated. Using these parameters, the values of Bruggeman factor (f B ), excess dielectric constant (ε E ) and excess inverse relaxation time (1/τ) E were also calculated. The effective Kirkwood correlation factor (g eff ) and corrective Kirkwood correlation factor (g f ) have also been determined and discussed to yield information on the structure and dynamics of the mixtures. The long range and short range interaction between the dipoles can be studied from the thermodynamic parameter, excess Helmholtz free energy (∆F E ). The free energy of activation for relaxation time (∆Fτ) were also calculated and interpreted on the basis of nature of molecular interaction.