The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform
Masayuki Ikeda - One of the best experts on this subject based on the ideXlab platform.
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Occupational Dimethylformamide exposure
International Archives of Occupational and Environmental Health, 1992Co-Authors: Tomojiro Yasugi, Toshio Kawai, Kazunori Mizunuma, Shun'ichi Horiguchi, Hiroshi Iguchi, Masayuki IkedaAbstract:A diffusive sampling method with water as absorbent was examined in comparison with 3 conventional methods of diffusive sampling with carbon cloth as absorbent, pumping through National Institute of Occupational Safety and Health (NIOSH) charcoal tubes, and pumping through NIOSH silica gel tubes to measure time-weighted average concentration of Dimethylformamide (DMF). DMF vapors of constant concentrations at 3–110 ppm were generated by bubbling air at constant velocities through liquid DMF followed by dilution with fresh air. Both types of diffusive samplers could either absorb or adsorb DMF in proportion to time (0.25–8 h) and concentration (3–58 ppm), except that the DMF adsorbed was below the measurable amount when carbon cloth samplers were exposed at 3 ppm for less than 1 h. When both diffusive samplers were loaded with DMF and kept in fresh air, the DMF in water samplers stayed unchanged for at least for 12 h. The DMF in carbon cloth samplers showed a decay with a half-time of 14.3 h. When the carbon cloth was taken out immediately after termination of DMF exposure, wrapped in aluminum foil, and kept refrigerated, however, there was no measurable decrease in DMF for at least 3 weeks. When the air was drawn at 0.2 l/min, a breakthrough of the silica gel tube took place at about 4 000 ppm · min (as the lower 95% confidence limit), whereas charcoal tubes could tolerate even heavier exposures, suggesting that both tubes are fit to measure the 8-h time-weighted average of DMF at 10 ppm.
Nelson Ramos Stradiotto - One of the best experts on this subject based on the ideXlab platform.
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Complexation studies of Sn(II) by N,N-Dimethylformamide and free energy of transfer of Sn(II) from acetonitrile to N,N-Dimethylformamide
Analytica Chimica Acta, 1991Co-Authors: S.m.a. Jorge, Nelson Ramos StradiottoAbstract:Abstract Studies of the complexation of Sn(II) by N,N-Dimethylformamide show that Sn(II) ion forms six successive complexes with the ligand. The stability constants were determined by the method of DeFord and Hume. The free energy of transfer of Sn(II) from acetonitrile to N,N-Dimethylformamide and to their mixtures was obtained using the theory of Cox et al. The energy decreases with increasing N,N-Dimethylformamide concentration, the decrease being most pronounced for nearly pure acetonitrile.
Arkadiusz Kłys - One of the best experts on this subject based on the ideXlab platform.
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Solvation enthalpy of selected glymes in the mixtures of N,N-Dimethylformamide with propan-1-ol or methanol at 298.15 K. The solvent contribution to the solvation enthalpy of glymes
Journal of Molecular Liquids, 2020Co-Authors: Małgorzata Jóźwiak, Katarzyna Łudzik, Maria Cokot, Andrzej Jóźwiak, Arkadiusz KłysAbstract:Abstract The enthalpies of solution of monoglyme, diglyme, triglyme, tetraglyme, pentaglyme and hexaglyme in N,N-dimethylforamide+propan-1-ol mixtures have been measured at 298.15 K. The preferential solvation process of glymes molecules in the mixtures of N,N-Dimethylformamide with methanol or propan-1-ol has been discussed. Then the contribution of DMF, PrOH, and MeOH to the solvation enthalpy of group (–CH2– and –O–) of glymes has been calculated. On the basis of the obtained data, the effect of the structural and energetic properties of the N,N-dimethylforamide+propan-1-ol mixtures on the solution enthalpy of glymes in this mixtures has been analyzed.
M. V. Prabhakara Rao - One of the best experts on this subject based on the ideXlab platform.
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Excess molar enthalpies of N, N-Dimethylformamide with chloroethanes and acetates at 298.15 K
Journal of Chemical & Engineering Data, 2000Co-Authors: Pannuru Venkatesu, M. V. Prabhakara Rao, R. S. Ramadevi, D. H. L. PrasadAbstract:The excess molar enthalpies (HE) at 298.15 K of N,N-Dimethylformamide (DMF) with 1,2-dichloroethane, 1,1,1-trichloroethane, 1,1,2,2-tetrachloroethane, ethyl acetate, and butyl acetate have been measured, using a Parr 1451 solution calorimeter, over the whole mole fraction range. The values of HE are negative for the mixtures of N,N-Dimethylformamide with 1,2-dichloroethane and 1,1,2,2-tetrachloroethane, and an inversion of sign from positive to negative is observed in the mixture N,N-Dimethylformamide with 1,1,1-trichloroethane. The H E values are positive over the whole mole fraction range for N,N-Dimethylformamide with ethyl acetate and butyl acetate. The HE data are interpreted on the basis of possible intermolecular interactions between unlike molecules.
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Excess Volumes of N,N-Dimethylformamide with Ketones at 303.15 K
Journal of Chemical & Engineering Data, 1996Co-Authors: P. Venkatesu And, M. V. Prabhakara RaoAbstract:Excess volumes, VE, of binary liquid mixtures of N,N-Dimethylformamide with methyl propyl ketone, diethyl ketone, methyl isobutyl ketone, methyl isopropyl ketone, and cyclohexanone at 303.15 K have been measured with a dilatometer. Excess volumes are negative for the systems of N,N-Dimethylformamide with methyl propyl ketone, diethyl ketone, methyl isobutyl ketone, and methyl isopropyl ketone and are positive for N,N-Dimethylformamide with cyclohexanone at 303.15 K.
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Excess Volumes of Substituted Benzenes with N,N-Dimethylformamide
Journal of Chemical & Engineering Data, 1995Co-Authors: R. S. Ramadevi, M. V. Prabhakara RaoAbstract:Excess volumes of binary liquid mixtures of N,N-Dimethylformamide with toluene, ethylbenzene, chlorobenzene, bromobenzene, nitrobenzene, and aniline at 303.15 and 313.15 K have been measured with a dilatometer. Excess volumes are negative for the systems of N,N-Dimethylformamide with toluene, ethylbenzene, chlorobenzene, bromobenzene, and aniline. The excess volumes are positive for the system N,N-Dimethylformamide with nitrobenzene at 303.15 K and show a change in sign at 313.15 K
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Excess volumes of ternary mixtures of N,N-Dimethylformamide + methyl ethyl ketone + 1-alkanols at 303.15 K
Journal of Chemical & Engineering Data, 1994Co-Authors: P. Venkatesu, D. Venkatesulu, M. V. Prabhakara RaoAbstract:Excess volumes for four ternary mixtures have been measured at 303.15 K. The mixtures are N,N-Dimethylformamide+methyl ethyl ketone+1-propanol, +1-butanol, +1-pentanol, or +1-hexanol. Excess volumes are negative for N,N-Dimethylformamide+methyl ethyl ketone+1-propanol and N,N-Dimethylformamide+methyl ethyl ketone+1-butanol over the entire range of composition. The measured ternary excess volume exhibits inversion in sign in the mixtures containing 1-pentanol and 1-hexanol. The measured data are compared with those predicted by empirical equations
Tomojiro Yasugi - One of the best experts on this subject based on the ideXlab platform.
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Occupational Dimethylformamide exposure
International Archives of Occupational and Environmental Health, 1992Co-Authors: Tomojiro Yasugi, Toshio Kawai, Kazunori Mizunuma, Shun'ichi Horiguchi, Hiroshi Iguchi, Masayuki IkedaAbstract:A diffusive sampling method with water as absorbent was examined in comparison with 3 conventional methods of diffusive sampling with carbon cloth as absorbent, pumping through National Institute of Occupational Safety and Health (NIOSH) charcoal tubes, and pumping through NIOSH silica gel tubes to measure time-weighted average concentration of Dimethylformamide (DMF). DMF vapors of constant concentrations at 3–110 ppm were generated by bubbling air at constant velocities through liquid DMF followed by dilution with fresh air. Both types of diffusive samplers could either absorb or adsorb DMF in proportion to time (0.25–8 h) and concentration (3–58 ppm), except that the DMF adsorbed was below the measurable amount when carbon cloth samplers were exposed at 3 ppm for less than 1 h. When both diffusive samplers were loaded with DMF and kept in fresh air, the DMF in water samplers stayed unchanged for at least for 12 h. The DMF in carbon cloth samplers showed a decay with a half-time of 14.3 h. When the carbon cloth was taken out immediately after termination of DMF exposure, wrapped in aluminum foil, and kept refrigerated, however, there was no measurable decrease in DMF for at least 3 weeks. When the air was drawn at 0.2 l/min, a breakthrough of the silica gel tube took place at about 4 000 ppm · min (as the lower 95% confidence limit), whereas charcoal tubes could tolerate even heavier exposures, suggesting that both tubes are fit to measure the 8-h time-weighted average of DMF at 10 ppm.
