Ryoichi Fujishiro

Excess enthalpies and volumes for N,N-dimethylacetamide + n-alcohols at 298.15 K☆

Abstract Molar excess enthalpies and volumes for methanol +, ethanol +, 1-propanol +, 1-butanol +, heptane ( H E only) +, and cyclohexane ( V E only) + N,N -dimethylacetamide and isopropyl ether + heptane were measured at 298.15 K, by using an isothermal displacement calorimeter and a double-stem pyknometer. Molar excess energies at constant total volume were calculated from these results and were analyzed in terms of quasilattice theory.

Excess enthalpies of mixing of a polar liquid + a non-polar liquid at 298.15 K

Abstract Excess enthalpies of N,N-dimethyl nitrosamine+carbon tetrachloride, and +benzene, dimethyl sulfoxide+benzene, benzonitrile+cyclohexane, +benzene, +toluene, and +chlorobenzene, and isomeric dichlorobenzenes+cyclohexane, and +benzene were measured by a successive dilution technique.

Excess enthalpies of binary mixtures of aromatic hydrocarbons and aliphatic ketones at 298.15 K

Abstract Excess enthalpies of the binary mixtures: benzene + diethyl ketone; toluene + diethyl ketone; ethyl benzene + diethyl ketone and + methyl ketone; and 1,3-diphenyl propane + diethyl ketone and + methyl ethyl ketone; were measured at 298.15 K and those of n -heptane + toluene and + ethyl benzene were also measured. The former mixtures, except for those containing methyl ethyl ketone, showed exothermic mixing, while the latter mixtures showed endothermic mixing. Comments about the molecular interactions contributing to the excess enthalpy of an aromatic hydrocarbon and an aliphatic ketone are made on the basis of these results.

Excess enthalpies of (cyclohexanone + aromatic hydrocarbon), (methyl cyclohexane + aromatic hydrocarbon), and (methyl cyclohexane + cyclohexanone) at 298.15 K

Excess enthalpies of cyclohexanone + benzene, + toluene, and + ethyl benzene, and of methyl cyclohexane + benzene, + toluene, + ethyl benzene, and + cyclohexanone were measured at 298.15 K. The first three mixed exothermically while the last four mixed endothermically. Comments about the molecular interactions contributing to the excess enthalpy of an aliphatic ketone + an aromatic hydrocarbon are made on the basis of these results.

Thermodynamics of aqueous solutions of nonelectrolytes. I. Enthalpies of transfer of 1-methyl-2-pyrrolidinone from water to aqueous methanol

Molar excess enthalpies were measured for 1-methyl-2-pyrrolidinone mixed with water and with methanol over the whole concentration range and with aqueous methanol at the low mole fraction of 1-methyl-2-pyrrolidinone at 298.15°K, using a LKB flow microcalorimeter. Enthalpies of transfer of 1-methyl-2-pyrrolidinone from water to aqueous methanol were estimated from the molar excess enthalpies. The result was qualitatively in agreement with the conclusion described by Arnett et al.

Excess enthalpies of N,N-dialkyl amides + cyclohexane, + benzene, and + toluene at 298.15 K

Abstract Molar excess enthalpies for N,N-dimethyl formamide, N,N-dimethyl acetamide, N,N-diethyl formamide, and N,N-dimethyl propionamide+cyclohexane, +benzene, and +toluene were measured at 298.15 K. The values of H E for cyclohexane solutions were large and positive, while those of solutions of aromatic hydrocarbon were slightly positive or negative.

Estimation of heat of dilution of polymer solution: a trial on a correction of the heat of stirring ascribed to the viscosity difference before and after dilution

Abstract The heat of dilution for the polystyrene and methyl ethyl ketone system was measured using an isothermal calorimeter, and the heat correction due to the change of stirring before and after dilution was estimated from the observed change in heat of dilution. The net heat of dilution of the polystyrene and methyl ethyl ketone system obtained was very small and the system was considered to be almost athermal. The heat correction due to the change of stirring was unexpectedly large, and often exceeded the net heat of dilution. The interaction parameters obtained for the polystyrene and methyl ethyl ketone system were +0·035, +0·012, −0·022, and −0·062 for molecular weights of 2100, 22 000, 57 500, and 212 000, respectively, at 298·15K.

Molar excess enthalpies and volumes of isomeric dichloroethylene mixtures at 298.15 K

Excess molar enthalpies and volumes for the three binary mixtures of cis-dichloroethylene, trans-dichloroethylene, and carbon tetrachloride were measured at 298.15 K with an isothermal displacement calorimeter and a double-stem pyknometer. The results are qualitatively interpreted in terms of dispersion and dipolar interactions.

Vapour pressure and thermodynamic properties of hexamethyldisilane at 305–387 K

Abstract The Swietoslawskis differential ebulliometer has been minimized to be usable for ca. 13 cm 3 of liquid. After a performance test with acetone, the vapour pressure of hexamethyldisilane is determined over the temperature range 304.61–386.74 K. The Antoine equation obtained is log 10 ( P /kPa) = 5.97097 − 1319.85/{( T /K) − 52.96} and the normal boiling point is 385.81 K. The present results agree with literature values of Suga and Seki at 287–310 K and Brockway and Davidson at 293–334 K.