H. Nakai, H. Soejima, K. Tamura
Jul 5, 1991
Citations
0
Influential Citations
20
Citations
Journal
Thermochimica Acta
Abstract
Abstract Thermodynamic properties of the 2,5,8-trioxanonane + n -octane mixture are studied at 298.15 K. The excess enthalpy H E and excess heat capacity C p E are measured. The excess volume V E is estimated from density measurement, and excess isentropic and isothermal compressibilities, k E S and k E T , are obtained from measurements of density and speed of sound. Excess enthalpy and excess volume are very large and positive and exhibit parabolic behavior, whereas excess heat capacity and excess compressibilities show anomalous dependence on concentration. Fluctuations of local concentration, the so-called non-randomness effect proposed by Patterson et al., are obviously observed. The thermodynamic properties of the mixture have been compared with those of dioxanonane isomer+ n -octane and 2,5,8-tri-oxanonane + n -heptane mixtures.