The molar heat capacities
of the pure samples of acetone and methanol, and the azeotropic mixture composed
of acetone and methanol were measured with an adiabatic calorimeter in the
temperature range 78–320 K. The solid–solid and solid–liquid
phase transitions of the pure samples and the mixture were determined based
on the curve of the heat capacity with respect to temperature. The phase transitions
took place at 126.160.68 and 178.961.47 K for the sample of
acetone, 157.790.95 and 175.930.95 K for methanol, which were
corresponding to the solid–solid and the solid–liquid phase transitions
of the acetone and the methanol, respectively. And the phase transitions occurred
at 126.580.24, 157.160.42, 175.500.46 and 179.740.89
K corresponding to the solid–solid and the solid–liquid phase
transitions of the acetone and the methanol in the mixture, respectively.
The thermodynamic functions and the excess thermodynamic functions of the
mixture relative to standard temperature 298.15 K were derived based on the
relationships of the thermodynamic functions and the function of the measured
heat capacity with respect to temperature.
Authors:Ke Liu, Xiao-Lin Zhou, Hai-Hua Chen, and Lai-Yu Lu
change at the transition pressure lies at 9%. So far, there has been considerable controversy for the phase transition of TiN. On the other hand, to the best of our knowledge, the thermodynamicproperties of TiN have not previously been reported. So, we
Authors:Y.-J. Song, S.-H. Meng, F.-D. Wang, C.-X. Sun, and Z.-C. Tan
Polyimide BTDA-ODA sample was prepared by polycondensation or step-growth polymerization method. Its low temperature heat capacities were measured by an adiabatic calorimeter in the temperature range between 80 and 400 K. No thermal anomaly was found in this temperature range. A DSC experiment was conducted in the temperature region from 373 to 673 K. There was not phase change or decomposition phenomena in this temperature range. However two glass transitions were found at 420.16 and 564.38 K. Corresponding heat capacity increments were 0.068 and 0.824 J g–1 K–1, respectively. To study the decomposition characteristics of BTDA-ODA, a TG experiment was carried out and it was found that this polyimide started to decompose at ca 673 K.
Authors:O. Pondarevskaya, O. Petrenko, V. Sudavtzova, V. Lisnyak, and N. Stus
Thermodynamic properties of pure titanium stannides obtained by crucible-less growth techniques under vacuum are determined
by differential scanning calorimetry and Knudsen effusion. The enthalpy, specific heat capacity, entropy and Gibbs energy
temperature dependence were simulated using Maier and Kelly equations. Standard enthalpies of evaporation, formation and atomization
of titanium stannides were determined and compared with earlier-known data.
A numerical study of the thermodynamic properties of a superconducting quantum cylinder in a longitudinal magnetic field is carried out. Closed-form expressions for the critical temperature, the free energy, the heat capacity jump, and the magnetization difference between the superconducting and normal phases as functions of the nanotube parameters are obtained in limit cases.
Authors:Zh. V. Dobrokhotova, A. I. Zaitsev, M. A. Zemchenko, A. D. Litvina, B. M. Mogutnov, and S. N. Yaschenko
The thermodynamic properties of calcium and barium phosphides have been determined in the temperature range 1178–1537 K by a Knudsen effusion technique combined with massspectral analysis of the evaporation products.
Authors:Himadri R. Soni, Venu Mankad, Sanjay D. Gupta, Sanjeev K. Gupta, and Prafulla K. Jha
and their thermodynamicalproperties is experiencing recent activity because of its fundamental research interest and technological applications in the field of microelectronics and optoelectronics, as a substrate for high speed electrical and
Authors:K. Sreekanth, M. Kondaiah, D. Sravana Kumar, and D. Krishna Rao
/isoamyl alcohols and N , N -dimethyl acetamide were added. The study of thermodynamicproperties of these multi component liquid mixtures and data on the analysis in terms of various models are important for industrial and pharmaceutical applications [ 6 ] such as
Authors:D. Falconieri, B. Marongiu, Alessandra Piras, Silvia Porcedda, and Enrica Tuveri
The data available in the literature on thermodynamic properties concerning different oxaalkanes + tetrachloromethane mixtures
are examined on the basis of the DISQUAC group contribution model. The obtained interaction parameters, dispersive and quasichemical,
depend on the intramolecular environment of the O atom. The steric effect results in a regular decrease of the quasichemical
interaction parameters of the oxygen/tetrachloromethane (e,d)-contact in linear ethers. The proximity effect of the O atoms
generates lower coefficients in dioxaalkanes with respect to monooxaalkanes and because of the ring strain, being the quasichemical
coefficients constant, the dispersive parameters in cyclic molecule are higher than in linear ethers.
Authors:Takayoshi Kimura, Takashi Yukiyama, and Masao Fujisawa
size of the hydrophobic parts and the positional effect of polar groups of a guest molecule on inclusion reactions, the thermodynamicproperties of inclusion complexes of CD with aliphatic alcohols and other alcohols have been investigated