articles by M. Mehedi Hasan Rocky
The present study mainly reports the theoretical estimation of dynamic viscosities, η, and kinem... more The present study mainly reports the theoretical estimation of dynamic viscosities, η, and kinematic viscosities, v, for 150 binary liquid systems comprising different categories of organic compounds: alkanes, alcohols, aromatics, ketones, esters, and amines as well as some other typical organics containing O, N, and S atoms: acetonitrile, nitromethane, nitrobenzene, pyridine, 4-methylpyridine, dimethyl sulfoxide, and sulfolane. Computations were performed following two different approaches. The first methodology corresponded to correlative models of Grunberg-Nissan, Hind, Heric, Ausländer, McAllister three-body and four-body equations as well as the Jouyban-Acree model. Fitting capabilities of simple polynomial equations and that of the Jouyban-Acree model for density and viscosity correlations were also tested for different degrees of polynomials. Accuracies of different models were analyzed by comparing values of σ\% as well as overall σ\% for different categories of binary systems investigated. Correlative models with a higher number of parameters can yield satisfactory results, the quality of correlations being dependent on the symmetry of model equations, molecular interactions, and the number of available data points also. On the other hand, the second methodology belongs to a predictive model: the UNIFAC-VISCO. Applicability of existing αnm parameters in predicting dynamic viscosities of the selected binary mixtures is tested by calculating the respective AAD\%. The results for AAD\% and OAAD\% values suggest that the UNIFAC-VISCO model can yield very good results in predicting both the dynamic and kinematic viscosities of liquid mixtures. Finally, 34 pairs of new group–group interaction parameters, αnm, of the UNIFAC-VISCO model were determined with various amines, acetonitrile, nitromethane, nitrobenzene, pyridine, dimethyl sulfoxide, sulfolane, etc. as one of the components. The availability of these new group interaction parameters would contribute further in extending the range of applicability of the conventional UNIFAC-VISCO model, even to a wider range of multicomponent liquid systems.
Densities, ρ, and refractive indices, nD for the binary systems of acetonitrile (ACN) + monoethan... more Densities, ρ, and refractive indices, nD for the binary systems of acetonitrile (ACN) + monoethanolamine (MEA), + monomethylethanolamine (MMEA), and + monoethylethanolamine (MEEA) have been measured in the whole range of composition and at different temperatures from T = (303.15 to 323.15) K for ρ, and at T = 303.15 for nD. Excess molar volumes, VmE, partial molar volumes, V¯i, thermal expansivities, α, and excess thermal expansivities, αE, were calculated from the experimental ρ. From measured nD at 303.15 K deviations in refractive index, ΔnD, and excess molar refractions, RmE, for these mixtures have also been evaluated. Values of VmE, αE, and RmE were found to be almost negative within the studied range of temperature. For each system the values of ρ, α, and nD were correlated to appropriate polynomials, whereas those of VmE, αE, ΔnD, and RmE were fitted to the Redlich-Kister type equations. Moreover, temperature dependent Jouyban-Acree model also showed satisfactory correlation with experimental ρ values for all the systems. Though intermolecular interactions of various types are to influence the variation patterns of VmE, V¯i, αE, and RmE vs. composition for these systems, it has been suggested that those due to cross H-bonding and interstitial accommodation effect have to play the significant roles.
Densities, ρ, viscosities, η, and refractive indices, nD, were measured for the binary mixtures o... more Densities, ρ, viscosities, η, and refractive indices, nD, were measured for the binary mixtures of tri-n-butyl phosphate (TBP) with toluene and ethylbenzene over the entire range of composition, and at different temperatures from T = (303.15 to 323.15) K. From experimental data of ρ, η, and nD, the excess molar volumes, VmE, partial molar volumes, V¯i, thermal expansivities, α, excess thermal expansivities, αE, deviations in viscosities, Δη, kinematic viscosities, ν, free energies, ∆G≠, excess free energies, ∆G≠E of viscous flow, deviations in refractive indices, ΔnD, and excess molar refractions, RmE, were calculated. To get the correlation coefficients and the relevant standard deviations, the values of ρ, η, and nD were correlated with concentration-dependent polynomial equations, whereas, those for the deviations/excess properties were fitted to the Redlich-Kister equation. Various laws of mixing for viscosities of liquid mixtures, such as, Grunberg-Nissan, Hind, Heric, Ausländer, and McAllister, were investigated to check their correlating ability with these systems. Moreover, the temperature dependent Jouyban-Acree model was used to correlate the experimental values of ρ and η. For both systems, the signs of αE and ΔnD were found to be all negative and those of Δη were positive. Plots of VmE or RmE against the mole fraction of TBP were sigmoid and resembled with each other. These variation patterns were discussed in reference to the nature of molecular interactions taking place between the component liquids.
Density, ρ, refractive index, nD, and sound velocity, u, have been measured for pure TBP, n-BuOH... more Density, ρ, refractive index, nD, and sound velocity, u, have been measured for pure TBP, n-BuOH, and their binary mixtures in the range, 0 ≤ x2 ≤ 1, between (303.15 and 323.15) K at an interval of 5 K. From measured ρ and nD, excess molar volumes, VmE, thermal expansivity, α, excess thermal expansivity, αE, and deviation in refractive index, ΔnD, were calculated. Furthermore, using ρ and u, some derived properties, such as acoustic impedance, z, isentropic compressibility, κs, and their deviations (Δu, Δz, and Δκs), were also calculated. Values of ρ, nD, u, z, and κs were found to correlate with concentration dependent polynomials, whereas the deviations/excess properties were fitted well to Redlich–Kister equations. The variation patterns of the studied properties were discussed with reference to the nature of molecular interactions taking place between the liquids of TBP and n-BuOH.
Densities, ρ, and viscosities, η, for the solutions 1-butanol (1-BuOH)+nitromethane (NM) and 1-Bu... more Densities, ρ, and viscosities, η, for the solutions 1-butanol (1-BuOH)+nitromethane (NM) and 1-BuOH+acetonitrile (ACN) have been measured in the whole range of composition between 303.15 and 323.15K at 5K interval. Excess molar volumes, VmE, were calculated from ρ at different temperatures and their concentration dependence was fitted to the Redlich–Kister equation. For both systems VmE were positive in the entire range, being more positive at higher temperatures. The maxima for VmE vs. x2 curves occurred nearly at 0.425 and 0.625mole fraction of NM and ACN, respectively, and their heights varied as, 1-BuOH+NM>1-BuOH+ACN. Measured η for the mixtures of 1-BuOH+NM and 1-BuOH+ACN were analyzed by correlating with the Grunberg–Nissan equation. Also, predictions were made about their kinematic viscosities (ν) by using the UNIFAC–VISCO model, which were fairly in good agreement with the experimental ν at different temperatures.
unknowns by M. Mehedi Hasan Rocky
Papers by M. Mehedi Hasan Rocky
Journal of Applied Science & Process Engineering
Viscosities (h) of three binary non-aqueous systems of ACN + MEA, + MMEA and + MEEA have been mea... more Viscosities (h) of three binary non-aqueous systems of ACN + MEA, + MMEA and + MEEA have been measured in the whole range of compositions at temperatures ranging between 303.15 and 323.15 K at an interval of 5 K. At different compositions, deviations in viscosity (Dh), free energy (ΔG‡) of activation for viscous flow along its excess values (ΔG‡E) were calculated from experimental ρ andh data. For all systems, h vs. x2 initially changed very slowly, but with the increment of solute concentration h were found to rise quite rapidly. The values of Dh were largely positive and they formed a sharp maximum invariably at the highly alkanolamine-rich regions. All positive values of Dh followed the increasing order as: ACN + MMEA > ACN + MEA > ACN + MEEA. The order of DG‡E at the maximum point was ACN + MMEA > ACN + MEA > ACN + MEEA. For the correlative model, zero parameter relations: Bingham, Kendall- Munroe, Gambill, and Eyring relations, one parameter relations: Hind, Grunber...
This protocol describes a simple way to make a mask at home using the cotton or linen woven fabri... more This protocol describes a simple way to make a mask at home using the cotton or linen woven fabric available in wearable cloth or household napkin. Fabric is soaked in a solution containing the table salt (NaCl) and starch. Starch is used to increase the droplet absorption efficiency of fabric whereas salt is added for improving the virus deactivation system. These simple preparation and wearing techniques will help anyone to prepare a mask for safety during COVID-19 pandemic, especially for those people having masks of little avail or no avail. DOI dx.doi.org/10.17504/protocols.io.be9djh26 PROTOCOL CITATION M Mehedi Hasan Rocky, Mohammad Amzad Hossain Bhuyan, Shamim Akhtar 2020. Simple Way to Make Homemade Cloth Masks: Fabrics Treated with NaCl and Starch Solution. protocols.io https://dx.doi.org/10.17504/protocols.io.be9djh26
Journal of Molecular Liquids, 2018
Journal of Molecular Liquids, 2018
Abstract Densities, ρ, viscosities, η, and refractive indices, nD, were measured for the binary m... more Abstract Densities, ρ, viscosities, η, and refractive indices, nD, were measured for the binary mixtures of tri-n-butyl phosphate (TBP) with toluene and ethylbenzene over the entire range of composition, and at different temperatures from T = (303.15 to 323.15) K. From experimental data of ρ, η, and nD, the excess molar volumes, VmE, partial molar volumes, V ¯ i , thermal expansivities, α, excess thermal expansivities, αE, deviations in viscosities, Δη, kinematic viscosities, ν, free energies, ∆G≠, excess free energies, ∆G≠E of viscous flow, deviations in refractive indices, ΔnD, and excess molar refractions, RmE, were calculated. To get the correlation coefficients and the relevant standard deviations, the values of ρ, η, and nD were correlated with concentration-dependent polynomial equations, whereas, those for the deviations/excess properties were fitted to the Redlich-Kister equation. Various laws of mixing for viscosities of liquid mixtures, such as, Grunberg-Nissan, Hind, Heric, Auslander, and McAllister, were investigated to check their correlating ability with these systems. Moreover, the temperature dependent Jouyban-Acree model was used to correlate the experimental values of ρ and η. For both systems, the signs of αE and ΔnD were found to be all negative and those of Δη were positive. Plots of VmE or RmE against the mole fraction of TBP were sigmoid and resembled with each other. These variation patterns were discussed in reference to the nature of molecular interactions taking place between the component liquids.
Journal of Chemical & Engineering Data, 2016
Density, ρ, refractive index, nD, and sound velocity, u, have been measured for pure TBP, n-BuOH,... more Density, ρ, refractive index, nD, and sound velocity, u, have been measured for pure TBP, n-BuOH, and their binary mixtures in the range, 0 ≤ x2 ≤ 1, between (303.15 and 323.15) K at an interval of 5 K. From measured ρ and nD, excess molar volumes, VmE, thermal expansivity, α, excess thermal expansivity, αE, and deviation in refractive index, ΔnD, were calculated. Furthermore, using ρ and u, some derived properties, such as acoustic impedance, z, isentropic compressibility, κs, and their deviations (Δu, Δz, and Δκs), were also calculated. Values of ρ, nD, u, z, and κs were found to correlate with concentration dependent polynomials, whereas the deviations/excess properties were fitted well to Redlich–Kister equations. The variation patterns of the studied properties were discussed with reference to the nature of molecular interactions taking place between the liquids of TBP and n-BuOH.
Industrial & Engineering Chemistry Research, 2020
Journal of Molecular Liquids
Densities, ρ, and viscosities, η, for the solutions 1-butanol (1-BuOH) + nitromethane (NM) and 1-... more Densities, ρ, and viscosities, η, for the solutions 1-butanol (1-BuOH) + nitromethane (NM) and 1-BuOH + acetonitrile (ACN) have been measured in the whole range of composition between 303.15 and 323.15 K at 5 K interval. Excess molar volumes, VmE, were calculated from ρ at different temperatures and their concentration dependence was fitted to the Redlich–Kister equation. For both systems VmE were positive in the entire range, being more positive at higher temperatures. The maxima for VmE vs. x2 curves occurred nearly at 0.425 and 0.625 mole fraction of NM and ACN, respectively, and their heights varied as, 1-BuOH + NM > 1-BuOH + ACN. Measured η for the mixtures of 1-BuOH + NM and 1-BuOH + ACN were analyzed by correlating with the Grunberg–Nissan equation. Also, predictions were made about their kinematic viscosities (ν) by using the UNIFAC–VISCO model, which were fairly in good agreement with the experimental ν at different temperatures.
Uploads
articles by M. Mehedi Hasan Rocky
unknowns by M. Mehedi Hasan Rocky
Papers by M. Mehedi Hasan Rocky