The Experts below are selected from a list of 261 Experts worldwide ranked by ideXlab platform
Taka-aki Hoshina - One of the best experts on this subject based on the ideXlab platform.
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Gas solubilities of nitrogen or oxygen in benzene, divinylbenzene, styrene and of an equimolar (N2:O2) mixture in styrene at (293–313) K
Fluid Phase Equilibria, 2019Co-Authors: Tomoya Tsuji, Kohei Ohya, Norhuda Binti Abdul Manaf, Taka-aki HoshinaAbstract:Abstract Nitrogen and oxygen gas solubilities were measured in benzene, divinylbenzene, and styrene at pressures up to 3.898 MPa and at 293 K, 303 K, and 313 K, because these liquids correspond to solvent, crosslinker and monomer, respectively. Gas solubilities for an equimolar mixture of nitrogen and oxygen were measured in styrene under the same experimental conditions. Gas solubilities in the liquids for a given isotherm had a linear pressure dependence and they decreased with increasing temperature. The solubility of oxygen was about 1.8 times larger than that of nitrogen in all liquids at any given temperature. Gas solubilities of equimolar mixture (N2:O2) were slightly closer to values of nitrogen than oxygen. The gas solubilities could be correlated with the forms of the Peng-Robinson equation of state to within the ARD of 1.637 and 1.310% for nitrogen and oxygen solubility by using the objective function, ∑ ( x 1 , exp − x 1 , calc ) . The ARDs were 0.497 and 0.491% for nitrogen and oxygen solubility from Henry's law. The data and correlation allow analysis of reacting systems for the prediction of the inductive time and the oxygen or air pressure as an inhibitor in radical polymerization.
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gas solubilities of nitrogen or oxygen in benzene divinylbenzene styrene and of an equimolar n2 o2 mixture in styrene at 293 313 k
Fluid Phase Equilibria, 2019Co-Authors: Tomoya Tsuji, Kohei Ohya, Norhuda Binti Abdul Manaf, Taka-aki HoshinaAbstract:Abstract Nitrogen and oxygen gas solubilities were measured in benzene, divinylbenzene, and styrene at pressures up to 3.898 MPa and at 293 K, 303 K, and 313 K, because these liquids correspond to solvent, crosslinker and monomer, respectively. Gas solubilities for an equimolar mixture of nitrogen and oxygen were measured in styrene under the same experimental conditions. Gas solubilities in the liquids for a given isotherm had a linear pressure dependence and they decreased with increasing temperature. The solubility of oxygen was about 1.8 times larger than that of nitrogen in all liquids at any given temperature. Gas solubilities of equimolar mixture (N2:O2) were slightly closer to values of nitrogen than oxygen. The gas solubilities could be correlated with the forms of the Peng-Robinson equation of state to within the ARD of 1.637 and 1.310% for nitrogen and oxygen solubility by using the objective function, ∑ ( x 1 , exp − x 1 , calc ) . The ARDs were 0.497 and 0.491% for nitrogen and oxygen solubility from Henry's law. The data and correlation allow analysis of reacting systems for the prediction of the inductive time and the oxygen or air pressure as an inhibitor in radical polymerization.
Tapio Alanissila - One of the best experts on this subject based on the ideXlab platform.
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alteration of gas phase ion polarizabilities upon hydration in high dielectric liquids
Journal of Chemical Physics, 2013Co-Authors: Sahin Buyukdagli, Tapio AlanissilaAbstract:We investigate the modification of gas phase ion polarizabilities upon solvation in polar solvents and ionic liquids. To this aim, we develop a classical electrostatic theory of charged liquids composed of solvent molecules modeled as finite size dipoles, and embedding polarizable ions that consist of Drude oscillators. In qualitative agreement with ab initio calculations of polar solvents and ionic liquids, the hydration energy of a polarizable ion in both types of dielectric liquid is shown to favor the expansion of its electronic cloud. Namely, the ion carrying no dipole moment in the gas phase acquires a dipole moment in the liquid environment, but its electron cloud also reaches an enhanced rigidity. We find that the overall effect is an increase of the gas phase polarizability upon hydration. In the specific case of ionic liquids, it is shown that this hydration process is driven by a collective solvation mechanism where the dipole moment of a polarizable ion induced by its interaction with surround...
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alteration of gas phase ion polarizabilities upon hydration in high dielectric liquids
arXiv: Soft Condensed Matter, 2013Co-Authors: Sahin Buyukdagli, Tapio AlanissilaAbstract:We investigate the modification of gas phase ion polarizabilities upon solvation in polar solvents and ionic liquids. To this aim, we develop a classical electrostatic theory of charged liquids composed of solvent molecules modeled as finite size dipoles, and embedding polarizable ions that consist of Drude oscillators. In qualitative agreement with ab-initio calculations of polar solvents and ionic liquids, the hydration energy of a polarizable ion in both type of dielectric liquid is shown to favor the expansion of its electronic cloud. Namely, the ion carrying no dipole moment in the gas phase acquires a dipole moment in the liquid environment, but its electron cloud also reaches an enhanced rigidity. We find that the overall effect is an increase of the gas phase polarizability upon hydration. In the specific case of ionic liquids, it is shown that this hydration process is driven by a collective solvation mechanism where the dipole moment of a polarizable ion induced by its interaction with surrounding ions self-consistently adds to the polarization of the liquid, thereby amplifying the dielectric permittivity of the medium in a substantial way. We propose this self-consistent hydration as the underlying mechanism behind the high dielectric permittivities of ionic liquids composed of small charges with negligible gas phase dipole moment. Hydration being a correlation effect, the emerging picture indicates that electrostatic correlations cannot be neglected in polarizable liquids.
Tomoya Tsuji - One of the best experts on this subject based on the ideXlab platform.
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Gas solubilities of nitrogen or oxygen in benzene, divinylbenzene, styrene and of an equimolar (N2:O2) mixture in styrene at (293–313) K
Fluid Phase Equilibria, 2019Co-Authors: Tomoya Tsuji, Kohei Ohya, Norhuda Binti Abdul Manaf, Taka-aki HoshinaAbstract:Abstract Nitrogen and oxygen gas solubilities were measured in benzene, divinylbenzene, and styrene at pressures up to 3.898 MPa and at 293 K, 303 K, and 313 K, because these liquids correspond to solvent, crosslinker and monomer, respectively. Gas solubilities for an equimolar mixture of nitrogen and oxygen were measured in styrene under the same experimental conditions. Gas solubilities in the liquids for a given isotherm had a linear pressure dependence and they decreased with increasing temperature. The solubility of oxygen was about 1.8 times larger than that of nitrogen in all liquids at any given temperature. Gas solubilities of equimolar mixture (N2:O2) were slightly closer to values of nitrogen than oxygen. The gas solubilities could be correlated with the forms of the Peng-Robinson equation of state to within the ARD of 1.637 and 1.310% for nitrogen and oxygen solubility by using the objective function, ∑ ( x 1 , exp − x 1 , calc ) . The ARDs were 0.497 and 0.491% for nitrogen and oxygen solubility from Henry's law. The data and correlation allow analysis of reacting systems for the prediction of the inductive time and the oxygen or air pressure as an inhibitor in radical polymerization.
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gas solubilities of nitrogen or oxygen in benzene divinylbenzene styrene and of an equimolar n2 o2 mixture in styrene at 293 313 k
Fluid Phase Equilibria, 2019Co-Authors: Tomoya Tsuji, Kohei Ohya, Norhuda Binti Abdul Manaf, Taka-aki HoshinaAbstract:Abstract Nitrogen and oxygen gas solubilities were measured in benzene, divinylbenzene, and styrene at pressures up to 3.898 MPa and at 293 K, 303 K, and 313 K, because these liquids correspond to solvent, crosslinker and monomer, respectively. Gas solubilities for an equimolar mixture of nitrogen and oxygen were measured in styrene under the same experimental conditions. Gas solubilities in the liquids for a given isotherm had a linear pressure dependence and they decreased with increasing temperature. The solubility of oxygen was about 1.8 times larger than that of nitrogen in all liquids at any given temperature. Gas solubilities of equimolar mixture (N2:O2) were slightly closer to values of nitrogen than oxygen. The gas solubilities could be correlated with the forms of the Peng-Robinson equation of state to within the ARD of 1.637 and 1.310% for nitrogen and oxygen solubility by using the objective function, ∑ ( x 1 , exp − x 1 , calc ) . The ARDs were 0.497 and 0.491% for nitrogen and oxygen solubility from Henry's law. The data and correlation allow analysis of reacting systems for the prediction of the inductive time and the oxygen or air pressure as an inhibitor in radical polymerization.
Sahin Buyukdagli - One of the best experts on this subject based on the ideXlab platform.
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alteration of gas phase ion polarizabilities upon hydration in high dielectric liquids
Journal of Chemical Physics, 2013Co-Authors: Sahin Buyukdagli, Tapio AlanissilaAbstract:We investigate the modification of gas phase ion polarizabilities upon solvation in polar solvents and ionic liquids. To this aim, we develop a classical electrostatic theory of charged liquids composed of solvent molecules modeled as finite size dipoles, and embedding polarizable ions that consist of Drude oscillators. In qualitative agreement with ab initio calculations of polar solvents and ionic liquids, the hydration energy of a polarizable ion in both types of dielectric liquid is shown to favor the expansion of its electronic cloud. Namely, the ion carrying no dipole moment in the gas phase acquires a dipole moment in the liquid environment, but its electron cloud also reaches an enhanced rigidity. We find that the overall effect is an increase of the gas phase polarizability upon hydration. In the specific case of ionic liquids, it is shown that this hydration process is driven by a collective solvation mechanism where the dipole moment of a polarizable ion induced by its interaction with surround...
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alteration of gas phase ion polarizabilities upon hydration in high dielectric liquids
arXiv: Soft Condensed Matter, 2013Co-Authors: Sahin Buyukdagli, Tapio AlanissilaAbstract:We investigate the modification of gas phase ion polarizabilities upon solvation in polar solvents and ionic liquids. To this aim, we develop a classical electrostatic theory of charged liquids composed of solvent molecules modeled as finite size dipoles, and embedding polarizable ions that consist of Drude oscillators. In qualitative agreement with ab-initio calculations of polar solvents and ionic liquids, the hydration energy of a polarizable ion in both type of dielectric liquid is shown to favor the expansion of its electronic cloud. Namely, the ion carrying no dipole moment in the gas phase acquires a dipole moment in the liquid environment, but its electron cloud also reaches an enhanced rigidity. We find that the overall effect is an increase of the gas phase polarizability upon hydration. In the specific case of ionic liquids, it is shown that this hydration process is driven by a collective solvation mechanism where the dipole moment of a polarizable ion induced by its interaction with surrounding ions self-consistently adds to the polarization of the liquid, thereby amplifying the dielectric permittivity of the medium in a substantial way. We propose this self-consistent hydration as the underlying mechanism behind the high dielectric permittivities of ionic liquids composed of small charges with negligible gas phase dipole moment. Hydration being a correlation effect, the emerging picture indicates that electrostatic correlations cannot be neglected in polarizable liquids.
Jisong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Rapid Measurement of Gas Solubility in Ionic Liquids with a Simple Tube-in-Tube Reactor
Industrial & Engineering Chemistry Research, 2019Co-Authors: Zhijun Zhao, Qingqiulin Zeng, Caijin Zhou, Jisong ZhangAbstract:Here, we present a strategy for rapid measurement of gas solubility in ionic liquids based on a simple configuration of tube-in-tube reactor. Ionic liquids can be rapidly saturated without direct contact of gas and liquid via a semipermeable Teflon AF-2400 inner tubing in the reactor, and the gas solubility can be easily determined by a steady-state flux balance of both gas and liquid flowing into the reactor. Solubility data of gaseous carbon dioxide (CO2), ethylene (C2H4), and ethane (C2H6) in several ionic liquids ([Emim][NTf2], [Omim][NTf2], [Bmim][BF4], [Bmim][PF6], and [Omim][NTf2]) were successfully determined at temperatures between 30 °C and 60 °C and low pressure (no higher than 8 bar), showing less than 8% deviation, compared with the literature values. A single gas solubility data point can be obtained within 10 min, showing high efficiency compared with conventional methods (5–48 h). Finally, the application scope and limitations of this method were discussed.
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Flow Toolkit for Measuring Gas Diffusivity in Liquids.
Analytical chemistry, 2019Co-Authors: Jisong Zhang, Andrew R Teixeira, Haomiao Zhang, Klavs F. JensenAbstract:Precise knowledge of gas diffusivity in liquids is critical for describing complex multiphase reaction systems. Here we present a high-throughput flow concept to measure gas diffusivity in liquids. This strategy takes advantage of the tube-in-tube reactor design whereby semipermeable Teflon AF-2400 tubes facilitate fast mass transfer between gas and liquid without directly contacting the two fluids. Coupled pseudosteady-state flux balances over the gas and liquid describe the gas dissolution rate and corresponding diffusivity with the aid of a single gas flow meter and a continuously ramped liquid flow rate. This in situ method demonstrates excellent accuracy in diffusion coefficient measurements, with less than 5% deviation from established techniques.