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Helmut Knapp - One of the best experts on this subject based on the ideXlab platform.
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densities and excess molar volumes for sulfolane ethylbenzene sulfolane 1 methylnaphthalene water n n dimethylformamide water methanol water n formylmorpholine and water n methylpyrrolidone
Journal of Chemical & Engineering Data, 1995Co-Authors: Guangshun Chen, Helmut KnappAbstract:Measurements of the densities have been made with a vibrating tube densimeter over the whole composition range for sulfolane + ethylbenzene and sulfolane + 1-methylnaphthalene at 313.15 and 333.15 K and water + N,N-dimethylformamide, water + methanol, water + N-formylmorpholine, and water + N-methylpyrrolidone at 283.15 and 313.15 K. Excess molar volumes (VE) calculated from the measured densities show Negative Deviation from the ideal for these systems. For water + methanol and sulfolane + ethylbenzene, the values of V E increase with increasing temperature, but for other systems, the values of V E decrease with increasing temperature. The values of V E were fitted to the polynomial function and correlated by means of the Peng-Robinson equation.
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Densities and Excess Molar Volumes for Sulfolane + Ethylbenzene, Sulfolane + 1-Methylnaphthalene, Water + N,N-Dimethylformamide, Water + Methanol, Water + N-Formylmorpholine, and Water + N-Methylpyrrolidone
Journal of Chemical & Engineering Data, 1995Co-Authors: Guangshun Chen, Helmut KnappAbstract:Measurements of the densities have been made with a vibrating tube densimeter over the whole composition range for sulfolane + ethylbenzene and sulfolane + 1-methylnaphthalene at 313.15 and 333.15 K and water + N,N-dimethylformamide, water + methanol, water + N-formylmorpholine, and water + N-methylpyrrolidone at 283.15 and 313.15 K. Excess molar volumes (VE) calculated from the measured densities show Negative Deviation from the ideal for these systems. For water + methanol and sulfolane + ethylbenzene, the values of V E increase with increasing temperature, but for other systems, the values of V E decrease with increasing temperature. The values of V E were fitted to the polynomial function and correlated by means of the Peng-Robinson equation.
Guangshun Chen - One of the best experts on this subject based on the ideXlab platform.
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densities and excess molar volumes for sulfolane ethylbenzene sulfolane 1 methylnaphthalene water n n dimethylformamide water methanol water n formylmorpholine and water n methylpyrrolidone
Journal of Chemical & Engineering Data, 1995Co-Authors: Guangshun Chen, Helmut KnappAbstract:Measurements of the densities have been made with a vibrating tube densimeter over the whole composition range for sulfolane + ethylbenzene and sulfolane + 1-methylnaphthalene at 313.15 and 333.15 K and water + N,N-dimethylformamide, water + methanol, water + N-formylmorpholine, and water + N-methylpyrrolidone at 283.15 and 313.15 K. Excess molar volumes (VE) calculated from the measured densities show Negative Deviation from the ideal for these systems. For water + methanol and sulfolane + ethylbenzene, the values of V E increase with increasing temperature, but for other systems, the values of V E decrease with increasing temperature. The values of V E were fitted to the polynomial function and correlated by means of the Peng-Robinson equation.
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Densities and Excess Molar Volumes for Sulfolane + Ethylbenzene, Sulfolane + 1-Methylnaphthalene, Water + N,N-Dimethylformamide, Water + Methanol, Water + N-Formylmorpholine, and Water + N-Methylpyrrolidone
Journal of Chemical & Engineering Data, 1995Co-Authors: Guangshun Chen, Helmut KnappAbstract:Measurements of the densities have been made with a vibrating tube densimeter over the whole composition range for sulfolane + ethylbenzene and sulfolane + 1-methylnaphthalene at 313.15 and 333.15 K and water + N,N-dimethylformamide, water + methanol, water + N-formylmorpholine, and water + N-methylpyrrolidone at 283.15 and 313.15 K. Excess molar volumes (VE) calculated from the measured densities show Negative Deviation from the ideal for these systems. For water + methanol and sulfolane + ethylbenzene, the values of V E increase with increasing temperature, but for other systems, the values of V E decrease with increasing temperature. The values of V E were fitted to the polynomial function and correlated by means of the Peng-Robinson equation.
R.a. Kusanur - One of the best experts on this subject based on the ideXlab platform.
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fluorescence quenching of boronic acid derivatives by aniline in alcohols a Negative Deviation from stern volmer equation
Journal of Luminescence, 2015Co-Authors: H. S. Geethanjali, D. Nagaraja, Raveendra Melavanki, R.a. KusanurAbstract:Abstract The fluorescence quenching study of two boronic acid derivatives 5-chloro-2-methoxy phenyl boronic acid (5CMPBA) and 4-fluoro-2-methoxyphenyl boronic acid (4FMPBA) in alcohols of varying viscosities is carried out at room temperature by steady state fluorescence measurements. Aniline is used as quencher. The Negative Deviation in the Stern–Volmer (S–V) plots has been observed for both the molecules with moderate quencher concentration. The downward curvature in the S–V plot is interpreted in terms of existence of different conformers of the solutes in the ground state. The formation of intermolecular and intramolecular hydrogen bonding in alcohol environments is taken to be responsible for the conformational changes in the ground state of the solutes. The modified Stern–Volmer equation or Lehrer equation is used to calculate Stern–Volmer constant ( K SV ) and it is found to be above 100 for most of the solvents used.
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Fluorescence quenching of boronic acid derivatives by aniline in alcohols – A Negative Deviation from Stern–Volmer equation
Journal of Luminescence, 2015Co-Authors: H. S. Geethanjali, D. Nagaraja, Raveendra Melavanki, R.a. KusanurAbstract:Abstract The fluorescence quenching study of two boronic acid derivatives 5-chloro-2-methoxy phenyl boronic acid (5CMPBA) and 4-fluoro-2-methoxyphenyl boronic acid (4FMPBA) in alcohols of varying viscosities is carried out at room temperature by steady state fluorescence measurements. Aniline is used as quencher. The Negative Deviation in the Stern–Volmer (S–V) plots has been observed for both the molecules with moderate quencher concentration. The downward curvature in the S–V plot is interpreted in terms of existence of different conformers of the solutes in the ground state. The formation of intermolecular and intramolecular hydrogen bonding in alcohol environments is taken to be responsible for the conformational changes in the ground state of the solutes. The modified Stern–Volmer equation or Lehrer equation is used to calculate Stern–Volmer constant ( K SV ) and it is found to be above 100 for most of the solvents used.
Peter Petrov - One of the best experts on this subject based on the ideXlab platform.
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Vapor-liquid equilibria at 101.3 kPa for diethylamine + chloroform
Journal of Chemical & Engineering Data, 1995Co-Authors: Jordan I. Ninov, Temenujka K. Stefanova, Peter PetrovAbstract:Vapor-liquid equilibria for diethylamine (1)+chloroform (2) were measured at 101.3 kPa. This system shows Negative Deviation from ideal behavior and presents a maximum boiling point azeotrope at 341.55 K at x 1 =0.4145. The experimental data were well correlated with the Wilson, UNIQUAC, and NRTL equations
Ville Alopaeus - One of the best experts on this subject based on the ideXlab platform.
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Vapor–liquid equilibrium for the binary systems tetrahydrothiophene + toluene and tetrahydrothiophene + o-xylene at 368.15 K and 383.15 K
Fluid Phase Equilibria, 2010Co-Authors: Erlin Sapei, Petri Uusi-kyyny, Kari I. Keskinen, Juha-pekka Pokki, Ville AlopaeusAbstract:Abstract Isothermal vapor–liquid equilibrium (VLE) for tetrahydrothiophene + toluene and tetrahydrothiophene + o-xylene at 368.15 K and 383.15 K was measured with a recirculation still. Liquid- and vapor-phase compositions were determined with gas chromatography. All systems exhibit a small positive Deviation from Raoult's law and show nearly ideal behavior. All VLE measurements passed the point test used. The experimental results were correlated with the Wilson model and compared with COSMO-SAC predictive models. COSMO-SAC predictions show a slight Negative Deviation from Raoult's law for all systems measured. Raoult's law can be used to describe all systems studied. The activity coefficients at infinite dilution are presented.
