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Shijun Han - One of the best experts on this subject based on the ideXlab platform.
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activity and osmotic coefficients for the ternary system sodium Bromide Tetramethylammonium Bromide water att 298 15 k
The Journal of Chemical Thermodynamics, 1998Co-Authors: Weidong Yan, Shijun HanAbstract:Abstract Activity coefficients of sodium Bromide in aqueous mixtures of (sodium Bromide and Tetramethylammonium Bromide) were determined by e.m.f. measurements at T =298.15 K and at eight different ionic strengths from (0.1 to 2.5) mol·kg −1 . The experimental data were fitted using the Scatchard, Pitzer, and Lim equations, respectively. The osmotic coefficients, excess Gibbs free energies of mixing, and activity coefficients of Tetramethylammonium Bromide were calculated using Pitzer parameters obtained in this work.
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Activity and osmotic coefficients for the ternary system (sodium Bromide + Tetramethylammonium Bromide + water) atT=298.15 K
The Journal of Chemical Thermodynamics, 1998Co-Authors: Weidong Yan, Shijun HanAbstract:Abstract Activity coefficients of sodium Bromide in aqueous mixtures of (sodium Bromide and Tetramethylammonium Bromide) were determined by e.m.f. measurements at T =298.15 K and at eight different ionic strengths from (0.1 to 2.5) mol·kg −1 . The experimental data were fitted using the Scatchard, Pitzer, and Lim equations, respectively. The osmotic coefficients, excess Gibbs free energies of mixing, and activity coefficients of Tetramethylammonium Bromide were calculated using Pitzer parameters obtained in this work.
Weidong Yan - One of the best experts on this subject based on the ideXlab platform.
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activity and osmotic coefficients for the ternary system sodium Bromide Tetramethylammonium Bromide water att 298 15 k
The Journal of Chemical Thermodynamics, 1998Co-Authors: Weidong Yan, Shijun HanAbstract:Abstract Activity coefficients of sodium Bromide in aqueous mixtures of (sodium Bromide and Tetramethylammonium Bromide) were determined by e.m.f. measurements at T =298.15 K and at eight different ionic strengths from (0.1 to 2.5) mol·kg −1 . The experimental data were fitted using the Scatchard, Pitzer, and Lim equations, respectively. The osmotic coefficients, excess Gibbs free energies of mixing, and activity coefficients of Tetramethylammonium Bromide were calculated using Pitzer parameters obtained in this work.
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Activity and osmotic coefficients for the ternary system (sodium Bromide + Tetramethylammonium Bromide + water) atT=298.15 K
The Journal of Chemical Thermodynamics, 1998Co-Authors: Weidong Yan, Shijun HanAbstract:Abstract Activity coefficients of sodium Bromide in aqueous mixtures of (sodium Bromide and Tetramethylammonium Bromide) were determined by e.m.f. measurements at T =298.15 K and at eight different ionic strengths from (0.1 to 2.5) mol·kg −1 . The experimental data were fitted using the Scatchard, Pitzer, and Lim equations, respectively. The osmotic coefficients, excess Gibbs free energies of mixing, and activity coefficients of Tetramethylammonium Bromide were calculated using Pitzer parameters obtained in this work.
Yoshikiyo Moroi - One of the best experts on this subject based on the ideXlab platform.
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Examination of Surface Adsorption of Soluble Surfactants by Surface Potential Measurement at the Air/Solution Interface
The Journal of Physical Chemistry C, 2008Co-Authors: Hiromichi Nakahara, Osamu Shibata, Muhammad Rusdi, Yoshikiyo MoroiAbstract:Surface potential (ΔV) of the air/surfactant-solution interface was measured by using an ionizing 241Am electrode method at 298.2 K, where the effect of the head groups on ΔV was also examined. Hexadecyltrimethylammonium Bromide (CTAB) and its homologous head group Tetramethylammonium Bromide (TAB) were used for examination of a cationic surfactant, sodium dodecyl sulfate (SDS), sodium methylsulfate (CH3SO4Na), and sodium hydrogensulfate (NaHSO4) for an anionic surfactant, and octaethylene glycol mono-n-tetradecyl ether (C14E8) and octaethylene glycol (E8) for a nonionic surfactant. For the cationic and nonionic systems, the surface potential of the homologous solutions gradually changed with concentration, whereas that of the corresponding surfactant solutions steeply increased up to 420 mV for CTAB at a concentration far below the critical micelle concentration (CMC), CMC/9, and up to 480 mV for C14E8 at CMC/18. For the anionic system, the surface potential traced a more complex variation with concentra...
Hiromichi Nakahara - One of the best experts on this subject based on the ideXlab platform.
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Examination of Surface Adsorption of Soluble Surfactants by Surface Potential Measurement at the Air/Solution Interface
The Journal of Physical Chemistry C, 2008Co-Authors: Hiromichi Nakahara, Osamu Shibata, Muhammad Rusdi, Yoshikiyo MoroiAbstract:Surface potential (ΔV) of the air/surfactant-solution interface was measured by using an ionizing 241Am electrode method at 298.2 K, where the effect of the head groups on ΔV was also examined. Hexadecyltrimethylammonium Bromide (CTAB) and its homologous head group Tetramethylammonium Bromide (TAB) were used for examination of a cationic surfactant, sodium dodecyl sulfate (SDS), sodium methylsulfate (CH3SO4Na), and sodium hydrogensulfate (NaHSO4) for an anionic surfactant, and octaethylene glycol mono-n-tetradecyl ether (C14E8) and octaethylene glycol (E8) for a nonionic surfactant. For the cationic and nonionic systems, the surface potential of the homologous solutions gradually changed with concentration, whereas that of the corresponding surfactant solutions steeply increased up to 420 mV for CTAB at a concentration far below the critical micelle concentration (CMC), CMC/9, and up to 480 mV for C14E8 at CMC/18. For the anionic system, the surface potential traced a more complex variation with concentra...
Tadeusz F. Molinski - One of the best experts on this subject based on the ideXlab platform.
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Addition of Cl2C: to (-)-O-menthyl acrylate under sonication-phase-transfer catalysis. Efficient synthesis of (+)- and (-)-(2-chlorocyclopropyl)methanol.
The Journal of organic chemistry, 2005Co-Authors: Makoto N. Masuno, Douglas M. Young, Alexander C. Hoepker, Colin K. Skepper, Tadeusz F. MolinskiAbstract:Dichlorocyclopropanation of (−)-O-menthyl acrylate under conditions of phase-transfer catalysis (CHCl3, KOH, Tetramethylammonium Bromide), with sonication, gives excellent yields (85−94%) of the corresponding dichlorocyclopropanecarboxylate ester compared to thermal conditions (90 °C, 56%). No diastereoselectivity was observed, but one isomer was isolated pure by fractional crystallization. The measured kinetic isotope effect (initial rate (CHCl3)/rate (CDCl3) ∼1.7) suggests deprotonation of CHCl3 as the rate-limiting step.