scholarly journals Thermodynamics Properties of 1,1-Carbonyldiimidazole (CDI) and 4-Imidazole Acrylic Acid, Obtained by DSC and Combustion Calorimetry

2020 ◽  
Vol 64 (4) ◽  
Author(s):  
Baudelio Campos ◽  
José María Del Toro Jauregui ◽  
Carmen Salomón ◽  
Eulogio Orozco-Guareño
Keyword(s):  
Differential Scanning Calorimetry ◽  
Imidazole Ring ◽  
Molar Enthalpy ◽  
Combustion Calorimetry ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Energy Of Combustion ◽  
Static Bomb ◽  
Molar Energy ◽  
Acrylic Group

Abstract. In this work, thermodynamic properties of 1,1-carbonyldiimidazole (CDI) and 4-imidazole acrylic are reported. The melting temperature, the enthalpy of fusion and the heat capacity of the compounds were determined by differential scanning calorimetry. The standard molar energy of combustion of both compounds were determined by static-bomb combustion calorimetry and the standard molar enthalpy of formation in the crystalline phase, at T = 298.15 K, was derived and evaluated for the two imidazole derivatives studied. The energetic influence of the acrylic group on the imidazole ring in each of the properties obtained is analyzed and compared with the existing results in the literature. Resumen. Se presentan las propiedades termodinámicas del 1,1-carbonildiimidazol (CDI) y el 4-imidazol acrílico. La temperatura de fusión, la entalpía de fusión y la capacidad calorífica de los compuestos se determinaron mediante calorimetría diferencial de barrido. La energía molar estándar de la combustión de ambos compuestos se determinó mediante calorimetría de combustión en bomba estática y la entalpía de formación en fase cristalina, a T= 298.15, fue derivada y evaluada para los dos compuestos derivados del imidazol. La influencia energética del grupo acrílico sobre el anillo de imidazol en cada una de las propiedades obtenidas se analiza y compara con los resultados existentes en la literatura.

Heat Capacity and Thermodynamic Properties of LaBr3 at 300 – 1100 K

2004 ◽  
Vol 59 (11) ◽  
pp. 825-828
Author(s):  
L. Rycerz ◽  
E. Ingier-Stocka ◽  
B. Ziolek ◽  
S. Gadzuric ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Properties ◽  
Temperature Dependence ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Temperature Range

The heat capacity of solid and liquid LaBr3 was measured by Differential Scanning Calorimetry (DSC) in the temperature range 300 - 1100 K. The obtained results were fitted by a polynomial temperature dependence. The enthalpy of fusion of LaBr3 was also measured. By combination of these results with the literature data on the entropy, S0m (LaBr3, s, 298.15 K) and the standard molar enthalpy of formation, ΔformH0m (LaBr3, s, 298.15 K), the thermodynamic functions of lanthanum tribromide were calculated up to 1300 K

scholarly journals Thermochemical Study of 1-Methylhydantoin

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 556
Author(s):  
Juan M. Ledo ◽  
Henoc Flores ◽  
Fernando Ramos ◽  
Elsa A. Camarillo
Keyword(s):  
Enthalpy Of Formation ◽  
Crystalline Phase ◽  
Heterocyclic Ring ◽  
Enthalpy Of Vaporization ◽  
Molar Enthalpy ◽  
Enthalpy Of Sublimation ◽  
Thermochemical Study ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Static Bomb

Using static bomb combustion calorimetry, the combustion energy of 1-methylhydantoin was obtained, from which the standard molar enthalpy of formation of the crystalline phase at T = 298.15 K of the compound studied was calculated. Through thermogravimetry, mass loss rates were measured as a function of temperature, from which the enthalpy of vaporization was calculated. Additionally, some properties of fusion were determined by differential scanning calorimetry, such as enthalpy and temperature. Adding the enthalpy of fusion to the enthalpy of vaporization, the enthalpy of sublimation of the compound was obtained at T = 298.15 K. By combining the enthalpy of formation of the compound in crystalline phase with its enthalpy of sublimation, the respective standard molar enthalpy of formation in the gas phase was calculated. On the other hand, the results obtained in the present work were compared with those of other derivatives of hydantoin, with which the effect of the change of some substituents in the base heterocyclic ring was evaluated.

Thermodynamics of SmCl3 and TmCl3: Experimental Enthalpy of Fusion and Heat Capacity. Estimation of Thermodynamic Functions up to 1300K

2002 ◽  
Vol 57 (1-2) ◽  
pp. 79-84
Author(s):  
L. Rycerz ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Enthalpy Of Fusion ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Temperature Coefficients ◽  
Experimental Enthalpy

Heat capacities of solid SmCl3 and TmCl3 were measured by differential scanning calorimetry in the ternperature range from 300 K up to the respective melting temperatures. The heat capacity of liquid SmCl3 was also investigated. These results were compared with literature data and fitted by a polynomial temperature dependence. The temperature coefficients were given. Additionally, the enthalpy of fusion of SmCl3 was measured. Furthermore, by combination of these results with the literature data on the entropy at 298.15 K, S0m(LnCl3, s, 298.15 K) and the standard molar enthalpy of formation of Δform H0m(LnCl3,s, 298.15 K), the meruiodynaniic functions were calculated up to T = 1300 K.

Thermodynamics of EuCl3: Experimental Enthalpy of Fusion and Heat Capacity and Estimation of Thermodynamic Functions up to 1300 K

2002 ◽  
Vol 57 (5) ◽  
pp. 215-220 ◽  
Author(s):  
L. Rycerz ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Temperature Dependence ◽  
Melting Temperature ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Experimental Enthalpy

The heat capacity of solid EuCl3 was measured by differential scanning calorimetry from 300 K up to the melting temperature, and beyond. These results were compared with literature data and fitted by a polynomial temperature dependence. The enthalpy of EuCl3 fusion was measured. Furthermore, by combination of these results with literature data on the entropy at 298.15 Sm0 (EuCl3, s, 298.15 K) and the standard molar enthalpy of formation of ∆form H0m (EuCl3, s, 298.15 K), the thermodynamic functions have been calculated up to 1300 K.

Thermodynamics of SmCl3 and TmCl3: Experimental Enthalpy of Fusion and Heat Capacity. Estimation of Thermodynamic Functions up to 1300K

2002 ◽  
Vol 57 (9-10) ◽  
pp. 79-84 ◽  
Author(s):  
L. Rycerz ◽  
M. Gaune-Escard
Keyword(s):  
Differential Scanning Calorimetry ◽  
Heat Capacity ◽  
Thermodynamic Functions ◽  
Molar Enthalpy ◽  
Enthalpy Of Fusion ◽  
Standard Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Melting Temperatures ◽  
Temperature Coefficients ◽  
Experimental Enthalpy

Heat capacities of solid SmCl3 and TmCl3 were measured by differential scanning calorimetry in the temperature range from 300 K up to the respective melting temperatures. The heat capacity of liquid SmCl3 was also investigated. These results were compared with literature data and fitted by a polynomial temperature dependence. The temperature coefficients were given. Additionally, the enthalpy of fusion of SmCl3 was measured. Furthermore, by combination of these results with the literature data on the entropy at 298.15 K, S0m (LnCl3, s, 298.15 K) and the standard molar enthalpy of formation of ΔformH0m (LnCl3, s, 298.15 K), the thermodynamic functions were calculated up to T = 1300 K.

Liquid–solid transition of water confined in nanoporous titanium dioxide

2016 ◽  
Vol 30 (19) ◽  
pp. 1650250
Author(s):  
Xin Gao ◽  
Qiang Wang ◽  
Gang Sun ◽  
Chenxi Li ◽  
Lin Hu
Keyword(s):  
Phase Transition ◽  
Differential Scanning Calorimetry ◽  
Titanium Dioxide ◽  
Transition Temperature ◽  
Pore Size ◽  
Phase Transition Temperature ◽  
Porous Titanium ◽  
Molar Enthalpy ◽  
Scanning Calorimetry ◽  
Filling Fraction

In this work, we performed differential scanning calorimetry (DSC) experiments to investigate the phase transition temperature and the molar enthalpy of the absorbed water confined in porous titanium dioxide. The porous titanium dioxide with three different pore size distribution and different filling fraction of the absorbed water were examined. We found that both the pore size of the examined samples and the filling fraction of the absorbed water affected the water’s phase transition temperature and its molar enthalpy.

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