6 research outputs found
Dielectric relaxation studies of binary mixtures of acetone and N-methylacetamide in benzene solution using microwave absorption data
921-925The dielectric relaxation times() and
the dipole moments() of the
binary mixtures of different molar concentrations of acetone(CH3COCH3)
in the binary mixtures of acetone and N-methylacetamide(NMA) in benzene solutions
have been calculated by using standard standing wave microwave techniques and
Gopala Krishna’s single frequency(9.88GHz) concentration variational
method at different temperatures (25, 30, 35, 40°C).The dielectric
relaxation process has been found to be an activated process. The energy
parameters (H, F, S) for the dielectric relaxation process of binary mixtures
containing 30% mole-fraction of acetone have been calculated at the respective
given temperatures and the comparison has been made with the corresponding
energy parameters (H, F, S) for the viscous flow. On the basis of the observations, it is
found that the dielectric relaxation process can be treated as the rate process
like the viscous flow process. The solute-solute and solute-solvent molecular
associations have been predicted
Dielectric relaxation studies of binary mixtures of acetone and N, N-dimethylacetamide in the benzene solutions using microwave absorption data
630-633<span style="font-size:
15.0pt;mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">Using
standard standing wave microwave techniques and following Gopala Krishna's
[Trans Faraday Soc, 33 (1957) 767] single frequency (9 .88 GHz) concentration
variational method, the dielectric relaxation times (τ<span style="font-size:14.5pt;mso-bidi-font-size:
7.5pt;font-family:" arial","sans-serif""="">) <span style="font-size:15.0pt;
mso-bidi-font-size:8.0pt;font-family:" times="" new="" roman","serif""="">and the dipole moments
(μ) of the binary mixtures of different molar concentrations of acetone (Ac) in
binary mixtures of acetone and N,N-dimethylacetamide in benzene solutions have
been calculated at different temperatures (25, 30, 35 and 40 °C.
The
energy parameters <span style="font-size:15.5pt;mso-bidi-font-size:
8.5pt;font-family:" times="" new="" roman","serif""="">(ΔHƐ , ΔFƐ<span style="font-size:15.5pt;mso-bidi-font-size:
8.5pt;font-family:" arial","sans-serif""="">,<span style="font-size:
15.5pt;mso-bidi-font-size:8.5pt;font-family:" times="" new="" roman","serif""=""> ΔSƐ)
for
the dielectric relaxation process of binary mixtures containing 50% mole
fractions of Ac have been calculated, at the respective given temperatures.
Comparison has been made with the corresponding energy parameters for viscous
now. From the observations, it is found that the dielectric relaxation process
like the viscous now process can be treated as the rate process. On the basis
of above studies, solute-solvent type of the molecular association can be
predicted.
</span
Dielectric Relaxation Studies of Binary Mixtures of Acetone and N-Methylformamide in the Benzene Solutions Using Microwave Absorption Data
Dielectric Relaxation Studies of Binary Mixtures of N- Methylformamide and Dimethylsulphoxide in Benzene Solution Using microwave Absorption Data
Dielectric relaxation study of binary mixtures of ethyl alcohol and N, N-dimethylformamide in benzene solution from microwave absorption data
163-167Dielectric constant (Ɛ′) and dielectric loss (Ɛ″) of ethanol (C₂H₅OH) and binary mixtures of ethanol and N, N-dimethylformamide (DMF) in benzene solutions have been measured at microwave frequency 9.883 GHz at different temperatures 25, 30, 35 and 40ºC. Standing microwave techniques and Gopala Krishna’s [Trans Faraday Soc, 33 (1957)767.] single frequency concentration variation method have been used for above measurements. The measured values of Ɛ′ and Ɛ″ have been used to evaluate dipole moment (μ) and relaxation time (). Various thermodynamic parameters (ΔH ΔFand ΔS) for the dielectric relaxation process of binary mixtures containing 50% mole fraction of OH have been calculated using Eyring’s rate equations. Comparison has been made with the corresponding energy parameters for viscous flow process. It is found that the dielectric relaxation process can be treated as the rate process like the viscous flow process. Non-linear variation of relaxation time with molar concentration of ethanol in the whole concentration range of the binary mixture indicates the existence of solute-solute type of molecular association