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Papers by Bakusele Kabane

Indian Journal of Chemistry -Section A (IJCA), Oct 15, 2020

The ultrasonic velocity (u) and density (q) of binary mixtures of 2-Chloroethanol (2-CletOH) with... more The ultrasonic velocity (u) and density (q) of binary mixtures of 2-Chloroethanol (2-CletOH) with 2-Dimethylaminoethanol (DMAE) and 2-Diethylaminoethanol (DEAE) have been measured over the entire concentration range at temperatures 293.15, 303.15 and 313.15 K. The ultrasonic velocity and density data are used to estimate adiabatic compressibility (b S), intermolecular free length (L f), molar sound velocity (R), molar compressibility (B) and specific acoustic impedance (Z) along with excess values of ultrasonic velocity (u E), adiabatic compressibility (b E S), intermolecular free length (L E f), acoustic impedance (Z E) and molar volume (V E m). The infrared spectra of both of the systems, 2-CletOH + DMAE and 2-Clet-OH + DEAE, have also been recorded at room temperature (298.15 K). The observed variations of these parameters, with concentration and temperature, are discussed in terms of the intermolecular interactions between the unlike molecules of the binary mixtures.

Ionic Liquids (ILs) are relatively newly formed types of solvents. As part of ongoing research, r... more Ionic Liquids (ILs) are relatively newly formed types of solvents. As part of ongoing research, research groups and industries are focusing on solvents classified as ionic liquids, which have a low melting point, and they have been given great attention focusing on their thermophysical properties and applications. In order to utilize or industrially exploit these

Social Science Research Network, 2023

Journal of Molecular Liquids, 2022

Abstract A novel ionic liquid (2′,3′-epoxypropyl-N-methyl-2-oxopyrrolidinium salicylate) was asse... more Abstract A novel ionic liquid (2′,3′-epoxypropyl-N-methyl-2-oxopyrrolidinium salicylate) was assessed for possible use in industrial separation problems. This was conducted using a gas liquid chromatography technique at different temperatures, T = (313.15 – 343.15) K and at atmospheric pressure. The molecular interactions within the ionic liquid were determined for 34 solutes (alkanes, alkenes, alkynes, alcohols, ketones, aromatic compounds, sulphur compound, THF, acetonitrile) and water. Excess thermodynamic properties (enthalpies, Δ H 1 E , ∞ , Gibbs free energy, Δ G 1 E , ∞ as well as the entropy term, Tref Δ S 1 E , ∞ ) at infinite dilution were calculated to further elucidate the intermolecular interactions occurring within the ionic liquid and solutes. The separation parameters (selectivity and capacity) values were computed from the activity coefficients at infinite dilution using the retention data obtained utilizing g.l.c to determine the feasibility of the ionic liquid for industrial separation processes. From the calculated selectivities and capacities, the presented ionic liquid can be suitable for the separation of industrial close boiling points mixtures. For the petrochemical separation problems, the investigated ionic liquids showed that large quantities would be required. The influence of cation and anion in the ionic liquid has been discussed. The investigated ionic liquid may be proposed for the separation of azeotropic mixtures such as alkane/alcohols, THF or acetone/alcohols.

ChemistrySelect

A deep understanding of the solute‐ deep eutectic solvent (DESs) interactions is required for an ... more A deep understanding of the solute‐ deep eutectic solvent (DESs) interactions is required for an appropriate selection of DESs as absorption media in the extraction of binary mixtures. As a result, these studies are done to evaluate the values of the activity coefficients at infinite dilution ( ), allowing us to define and understand the nature of these intermolecular interactions comprising DES mixtures with volatile organic solvents at different temperatures using gas liquid chromatography technique to determine the for 34 solutes in DESs [zinc chloride+acetic or phosphoric acid] prepared at 1 : 2 molar ratio for the temperature range (313.15–353.15) K. The thermal stability of the prepared DESs was determined by a thermogravimetric analyser. Excess thermodynamic parameters [partial molar excess enthalpies and Gibbs free energies ] were derived from the data. The selectivity and capacity values for the industrial separations were calculated and compared with the literature values ...

This work focusses on the application and pre-screening of selected ILs for different industrial ... more This work focusses on the application and pre-screening of selected ILs for different industrial separation problems based on limiting activity coefficients at infinite dilution, and liquid-liquid equilibrium data at different temperatures. The selected ionic liquids for pre-screening based on activity coefficients at infinite dilution data include (1,3- dimethyimidazolium dimethylphosphate, trioctylmethylammonium chloride, trihexyltetradecylphosphonium dicyanamide, 2,3-dihydroxypropyl-N-methyl-2- oxopyrrolidinium chloride, 2,3-epoxypropyl methyl-2-oxopyrrolidinium chloride) and deep eutectic solvent (1-butyl-3-methylimidazolium chloride + glycerol) at 1:2 molar ratio. These ionic liquids were tested in 33 solutes (alkanes, alkenes, alkynes, alcohols, tetrahydrofuran, ketones, aromatic hydrocarbons, thiophene, acetonitrile) and water at T = (313 – 343) K and at p = 101 kPa. The use of ionic liquid as a stationary phase on the column loading ranged between (30 – 36) % by mass. Thermo...

Radiation Research, Sep 21, 2018

Radiation research, Jan 18, 2018

During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-... more During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) substrate, the radiolytically-produced styryl and carbon-centered FEP radicals undergo various desired and undesired competing reactions. In this study, a high-dose rate is used to impede the undesired free radical homopolymerization of styrene and ensure uniform covalent grafting through 125-μm FEP films. This outweighs the enhancement of the undesired crosslinking reactions of carbon-centered FEP radicals and the dimerization of the styryl radicals. The degree of uniform grafting through 125-μm FEP films increases from ≈8%, immediately after pulsed electron irradiation to 33% with the subsequent thermal treatment exceeding the glass transition temperature of FEP of 39°C. On the contrary, steady-state radiolysis using Co gamma radiolysis, shows that the undesired homopolymerization of the styrene has become the predominant reaction with a negligible degree of ...

Journal of Molecular Liquids

Thermophysical properties of binary systems containing trihexyltetradecylphosphonium chloride [P1... more Thermophysical properties of binary systems containing trihexyltetradecylphosphonium chloride [P14, 6, 6, 6] [Cl ̶ ] ionic liquid (IL) and propanoic acid (PA), have been investigated. Measurements of densities , and speeds of sound have been made at p = 0.1 MPa and at varying temperatures ranging from 293.15 to 313.15 K. The computed excess properties which include excess molar volume , apparent molar volume ( , intermolecular free length (Lf), isentropic compressibility , apparent molar isentropic compressibility ( ) and deviation in isentropic compressibility ∆ have been computed from the experimental data of densities and speeds of sound. Based on the calculated derived properties, it is evident that the investigated IL and PA exhibit strong interactions across the entire mole fraction composition. Good correlation has been achieved with the Redlich-Kister equation.

Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Sc... more Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Science in Chemistry, Durban University of Technology. Durban, South Africa, 2018.

Journal of Molecular Liquids

Journal of Chemical & Engineering Data

Indian Journal of Chemistry -Section A (IJCA), Oct 15, 2020

The ultrasonic velocity (u) and density (q) of binary mixtures of 2-Chloroethanol (2-CletOH) with... more The ultrasonic velocity (u) and density (q) of binary mixtures of 2-Chloroethanol (2-CletOH) with 2-Dimethylaminoethanol (DMAE) and 2-Diethylaminoethanol (DEAE) have been measured over the entire concentration range at temperatures 293.15, 303.15 and 313.15 K. The ultrasonic velocity and density data are used to estimate adiabatic compressibility (b S), intermolecular free length (L f), molar sound velocity (R), molar compressibility (B) and specific acoustic impedance (Z) along with excess values of ultrasonic velocity (u E), adiabatic compressibility (b E S), intermolecular free length (L E f), acoustic impedance (Z E) and molar volume (V E m). The infrared spectra of both of the systems, 2-CletOH + DMAE and 2-Clet-OH + DEAE, have also been recorded at room temperature (298.15 K). The observed variations of these parameters, with concentration and temperature, are discussed in terms of the intermolecular interactions between the unlike molecules of the binary mixtures.

Ionic Liquids (ILs) are relatively newly formed types of solvents. As part of ongoing research, r... more Ionic Liquids (ILs) are relatively newly formed types of solvents. As part of ongoing research, research groups and industries are focusing on solvents classified as ionic liquids, which have a low melting point, and they have been given great attention focusing on their thermophysical properties and applications. In order to utilize or industrially exploit these

Social Science Research Network, 2023

Journal of Molecular Liquids, 2022

Abstract A novel ionic liquid (2′,3′-epoxypropyl-N-methyl-2-oxopyrrolidinium salicylate) was asse... more Abstract A novel ionic liquid (2′,3′-epoxypropyl-N-methyl-2-oxopyrrolidinium salicylate) was assessed for possible use in industrial separation problems. This was conducted using a gas liquid chromatography technique at different temperatures, T = (313.15 – 343.15) K and at atmospheric pressure. The molecular interactions within the ionic liquid were determined for 34 solutes (alkanes, alkenes, alkynes, alcohols, ketones, aromatic compounds, sulphur compound, THF, acetonitrile) and water. Excess thermodynamic properties (enthalpies, Δ H 1 E , ∞ , Gibbs free energy, Δ G 1 E , ∞ as well as the entropy term, Tref Δ S 1 E , ∞ ) at infinite dilution were calculated to further elucidate the intermolecular interactions occurring within the ionic liquid and solutes. The separation parameters (selectivity and capacity) values were computed from the activity coefficients at infinite dilution using the retention data obtained utilizing g.l.c to determine the feasibility of the ionic liquid for industrial separation processes. From the calculated selectivities and capacities, the presented ionic liquid can be suitable for the separation of industrial close boiling points mixtures. For the petrochemical separation problems, the investigated ionic liquids showed that large quantities would be required. The influence of cation and anion in the ionic liquid has been discussed. The investigated ionic liquid may be proposed for the separation of azeotropic mixtures such as alkane/alcohols, THF or acetone/alcohols.

ChemistrySelect

A deep understanding of the solute‐ deep eutectic solvent (DESs) interactions is required for an ... more A deep understanding of the solute‐ deep eutectic solvent (DESs) interactions is required for an appropriate selection of DESs as absorption media in the extraction of binary mixtures. As a result, these studies are done to evaluate the values of the activity coefficients at infinite dilution ( ), allowing us to define and understand the nature of these intermolecular interactions comprising DES mixtures with volatile organic solvents at different temperatures using gas liquid chromatography technique to determine the for 34 solutes in DESs [zinc chloride+acetic or phosphoric acid] prepared at 1 : 2 molar ratio for the temperature range (313.15–353.15) K. The thermal stability of the prepared DESs was determined by a thermogravimetric analyser. Excess thermodynamic parameters [partial molar excess enthalpies and Gibbs free energies ] were derived from the data. The selectivity and capacity values for the industrial separations were calculated and compared with the literature values ...

This work focusses on the application and pre-screening of selected ILs for different industrial ... more This work focusses on the application and pre-screening of selected ILs for different industrial separation problems based on limiting activity coefficients at infinite dilution, and liquid-liquid equilibrium data at different temperatures. The selected ionic liquids for pre-screening based on activity coefficients at infinite dilution data include (1,3- dimethyimidazolium dimethylphosphate, trioctylmethylammonium chloride, trihexyltetradecylphosphonium dicyanamide, 2,3-dihydroxypropyl-N-methyl-2- oxopyrrolidinium chloride, 2,3-epoxypropyl methyl-2-oxopyrrolidinium chloride) and deep eutectic solvent (1-butyl-3-methylimidazolium chloride + glycerol) at 1:2 molar ratio. These ionic liquids were tested in 33 solutes (alkanes, alkenes, alkynes, alcohols, tetrahydrofuran, ketones, aromatic hydrocarbons, thiophene, acetonitrile) and water at T = (313 – 343) K and at p = 101 kPa. The use of ionic liquid as a stationary phase on the column loading ranged between (30 – 36) % by mass. Thermo...

Radiation Research, Sep 21, 2018

Radiation research, Jan 18, 2018

During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-... more During the pulsed-electron beam direct grafting of neat styrene onto poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP) substrate, the radiolytically-produced styryl and carbon-centered FEP radicals undergo various desired and undesired competing reactions. In this study, a high-dose rate is used to impede the undesired free radical homopolymerization of styrene and ensure uniform covalent grafting through 125-μm FEP films. This outweighs the enhancement of the undesired crosslinking reactions of carbon-centered FEP radicals and the dimerization of the styryl radicals. The degree of uniform grafting through 125-μm FEP films increases from ≈8%, immediately after pulsed electron irradiation to 33% with the subsequent thermal treatment exceeding the glass transition temperature of FEP of 39°C. On the contrary, steady-state radiolysis using Co gamma radiolysis, shows that the undesired homopolymerization of the styrene has become the predominant reaction with a negligible degree of ...

Journal of Molecular Liquids

Thermophysical properties of binary systems containing trihexyltetradecylphosphonium chloride [P1... more Thermophysical properties of binary systems containing trihexyltetradecylphosphonium chloride [P14, 6, 6, 6] [Cl ̶ ] ionic liquid (IL) and propanoic acid (PA), have been investigated. Measurements of densities , and speeds of sound have been made at p = 0.1 MPa and at varying temperatures ranging from 293.15 to 313.15 K. The computed excess properties which include excess molar volume , apparent molar volume ( , intermolecular free length (Lf), isentropic compressibility , apparent molar isentropic compressibility ( ) and deviation in isentropic compressibility ∆ have been computed from the experimental data of densities and speeds of sound. Based on the calculated derived properties, it is evident that the investigated IL and PA exhibit strong interactions across the entire mole fraction composition. Good correlation has been achieved with the Redlich-Kister equation.

Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Sc... more Submitted in the fulfillment of the academic requirements for the degree of Masters of Applied Science in Chemistry, Durban University of Technology. Durban, South Africa, 2018.

Journal of Molecular Liquids

Journal of Chemical & Engineering Data