B. B. Swain

Ultrasonic investigation in a polar-polar system—metyl isobutyl ketone (MIBK) and aliphatic alcohols

Abstract The ultrasonic velocity in binary mixtures of MIBK with eight aliphatic alcohols viz. 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, 1-octanol and 1-decanol is measured at frequency 2MHz and temperature 303.16 K for entire range of concentration using an ultrasonic interferometer. The measured data are used to compute isentropic compressibility, molar compressibility, inter molecular free length, available volume and acoustic impedance. The excess properties are also evaluated. The trends of variation of these parameters indicate that the nature of interaction is dependent upon chain-length of alcohols. The findings are compared with the results obtained from dielectric studies undertaken earlier.

Dielectric investigation on a nuclear extractant-acetylacetone (HAA) in nonpolar solvents

Abstract The relative permittivity of binary mixtures of acetylacetone (HAA) a nuclear extractant with six nonpolar solvents is measured at frequency 455 kHz and temperature 303.16K. The dielectric constant data are used to compute the linear correlation factor, excess molar polarization and excess Gibbs free energy in the binary mixtures. The molecular interaction is found to be dependent upon concentration of HAA as well as the nature of the solvent.

Dielectric Studies on Binary Mixtures of Tri-n-butyl Phosphate (TBP) and Long-Chain Primary Alcohols (Modifiers)

Dielectric constant (e) of Tri-n-butyl phosphate (TBP), in binary mixtures with five long-chain primary alcohols viz; 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol and 1-octanol has been measured at ν=455 kHz and at temperature 302 K. The data is used to evaluate mutual correlation factor gab, excess molar polarization ΔP and excess free energy of mixing ΔFab by using Winkelmann-Quitzsch eqn. for binary mixtures to assess the suitability of the alcohols as modifiers. The trend of variation of these parameters exhibit marked dependence on chain-length of the alcohols indicating 1-heptanol to be an efficient modifier.

Molecular Interaction in Binary Mixtures of Tri-N-Butyl Phosphate (TBP) and Aliphatic Alcohols-Effect of Free Volume and Internal Pressure

Abstract The ultrasonic velocity, density and viscosity in binary mixtures of TBP with a number of aliphatic primary alcohols viz. methanol, ethanol, 1-hexanol, 1-heptanol, 1-octanol and 1-decanol have been measured at frequency 3 MHz and at temperature 303.16 K. The data are used to compute excess internal pressure and excess enthalpy in these mixtures. The results corroborate the findings of these authors from dielectric studies that the interaction is maximum in 1 heptanol-TBP system and microheterogeneous β-clusters with antiparaliel orientation of dissimilar molecules predominate in it.

Dipolar Interaction in Binary Polar Systems-a Dielectric Study of Acetyl Acetone (HAA) and DI-ISO Butyl Ketone (DIBK) with Some Monosubstituted Benzenes

Abstract Experimentally measured values of dielectric constant (∊) at a frequency of 455 kHz and temperature 303.16K in binary polar mixture of acetyl acetone and of di-iso-butyl ketone in chlorobenzene, bromobenzene and toluene have been used to compute the mutual correlation factor (gab ), the excess molar polarization (ΔP) and the Gibbs free energy of mixing (ΔGab ) using Winkelmann-Quitzsch equations. The results are utilised in interpreting the molecular association and hence the nature of clusters involving unlike molecules.

Study of some dipolar complexes involving long chain aliphatic alcohols

The mechanism of 1:1 dipolar complexation of some long-chain aliphatic alcohols with chlorobenzene and acetic acids in a non-polar medium is studied. The interaction dipole moment △→µ, the excess molar polarization ΔP and apparent complex formation constantKapp are evaluated following two independent methods. It is observed from the value of △→µ that the complex formation is mostly due to polarization interaction and is of the same type as involving lower alcohols. ΔP andKapp are, however, of different nature compared to those in lower alcohols suggesting that the unlike molecules form relatively stable linear linkage resulting in antiparallel orientation prior to forming complexes.

Dipolar interaction in a bipolar system-long-chain aliphatic alcohols with carboxylic acids

Abstract Dielectric constant of binary mixtures of some long-chain aliphatic alcohols i.e. n-propanol, n-pentanol, n-hexanol, n-heptanol and n-octanol with propionic acid and butyric acid measured at 455 kHz and at 303.16 K are utilised to calculate mutual correlation factor gab , excess molar polarization Δp and excess free energy of mixing ΔFab in those binary mixtures. The results indicate that acid-alcohol interaction is stronger in butyric acid system than in the propionic acid system.

Dipolar Association in Binary System: MIBK in Carboxylic Acids

The dielectric constant (e) of the binary mixtures of MIBK with some carboxylic acids viz. acetic acid, propanoic acid and butyric acid is measured at 303.16 K at 455 kHz. The experimental data are used to compute the excess dielectric constant (Δe), mutual correlation factor (g ab), excess molar polarization (ΔP) and excess free energy of mixing (ΔG ab) in these mixtures.

Evaluation of linear correlation factor in dilute binary mixtures: Alcohols and amines with non-polar solvents

Linear correlation factor in very dilute solutions (mole fraction < 0.1) of binary mixtures of alcohols and some amines in three nonpolar solvents, i.e. benzene, carbon tetrachloride and p-xylene is estimated at 301 K and extrapolated to zero concentration of the solute. It is found to increase in the mixtures containing alcohol while it decreases to a low positive value in the mixtures containing amines.

Dielectric studies of binary mixtures of butanols in nonpolar solvents - solute-solvent interactions

Abstract Dielectric constant of binary mixtures of n-Butanol, i-Butanol and t-Butanol in three nonpolar solvents namely benzene, carbon tetrachloride, and n-heptane have been measured at radio frequency. Eyrings interaction parameter G* based on the significant structure model has been calculated in these mixtures. This parameter G* reflecting the non-specific solute - solvent interactions is found to be influenced by the nature of the solvent. The calculated value of G* has been used for interpreting dipole interaction of the solute domains in solvent environment. The results of this study finds further corroboration in the earlier findings of these authors on excess molar polarization in these mixtures.