A Calorimetric Determination of the Standard Enthalpy and Heat Capacity Changes that Accompany Micelle Formation for Four Long Chain Alkyldimethylphosphine Oxides in H2O and D2O Solution from 15 to 79 °C

1998 ◽  
Vol 120 (42) ◽  
pp. 10964-10969 ◽  
Author(s):  
Gordon C. Kresheck
Keyword(s):  
Heat Capacity ◽  
Standard Enthalpy ◽  
Micelle Formation ◽  
Heat Capacity Changes ◽  
Calorimetric Determination ◽  
Long Chain

Calorimetric determination of the heat capacity changes associated with the conformational transitions of polyriboadenylic acid and polyribouridylic acid

Biopolymers ◽  
1977 ◽  
Vol 16 (12) ◽  
pp. 2641-2652 ◽  
Author(s):  
J. Suurkuusk ◽  
J. Alvarez ◽  
E. Freire ◽  
R. Biltonen
Keyword(s):  
Heat Capacity ◽  
Conformational Transitions ◽  
Heat Capacity Changes ◽  
Calorimetric Determination

Calorimetric determination of the enthalpy and heat capacity changes for the association of haptoglobin with hemoglobin. I. Demonstration of two interacting systems

Biochemistry ◽  
1974 ◽  
Vol 13 (10) ◽  
pp. 2231-2234 ◽  
Author(s):  
Francoise Lavialle ◽  
Monique Rogard ◽  
Annette Alfsen
Keyword(s):  
Heat Capacity ◽  
Heat Capacity Changes ◽  
Interacting Systems ◽  
Calorimetric Determination

Protonation of azobenzene derivatives. I. Methyl orange and ortho-methyl orange

1973 ◽  
Vol 26 (5) ◽  
pp. 1005 ◽  
Author(s):  
PD Bolton ◽  
J Ellis ◽  
KA Fleming ◽  
IR Lantzke
Keyword(s):  
Heat Capacity ◽  
Methyl Orange ◽  
Aqueous Solutions ◽  
Standard Enthalpy ◽  
Acidity Constants ◽  
Temperature Range ◽  
Heat Capacity Changes ◽  
Azobenzene Derivatives

Thermodynamic acidity constants have been measured over the temperature range 5-50� for aqueous solutions of sodium 4?-dimethylaminoazobenzene- 4-sulphonate (methyl orange) and sodium 4?-dimethylaminoazobenzene-2- sulphonate (ortho-methyl orange). From these data values of the standard enthalpy, entropy, and heat capacity changes have been calculated for these compounds. These results are discussed in conjunction with previous spectrophotometric and other data with reference to the nature of the equilibrium systems involved in these protonation reactions. It is concluded that existing evidence does not allow an unequivocal assignment of the sites of protonation of these and related molecules.

scholarly journals Standard enthalpy of formation of selenium stannite Cu2FeSnSe4

2019 ◽  
Vol 64 (10) ◽  
pp. 1105-1108
Author(s):  
A. V. Baranov ◽  
T. A. Stolyarova ◽  
E. A. Brichkina ◽  
E. G. Osadchii
Keyword(s):  
Solar Cells ◽  
Enthalpy Of Formation ◽  
Standard Enthalpy ◽  
Pure Form ◽  
Standard Enthalpy Of Formation ◽  
Functional Material ◽  
First Time ◽  
Calorimetric Determination

The calorimetric determination of the standard enthalpy of formation of Cu2FeSnSe4 selenium stannite (CITSe) was carried out for the first time. This compound in its pure form does not occur in nature, but is a promising functional material (direct-gap semiconductor) and is used in photovoltaics to create solar cells as an alternative to silicon. The standard enthalpy of Cu2FeSnSe4 formation was obtained by measuring the heat of its formation from the elements in the calorimeter according to the reaction 2Cu + Fe + Sn + 4Se Cu2FeSnSe4. As a result, the standard enthalpy of formation is detrmined: ∆fH0298.15K(Cu2FeSnSe4) = (254.11 3.96) kJ/mol.

Calorimetric determination of the heats of micelle formation of some non-ionic detergents

1964 ◽  
Vol 60 ◽  
pp. 996 ◽  
Author(s):  
J. M. Corkill ◽  
J. F. Goodman ◽  
J. R. Tate
Keyword(s):  
Micelle Formation ◽  
Ionic Detergents ◽  
Calorimetric Determination

Aqueous nonelectrolyte solutions. Part XVII. Formula of hydrogen sulfide hydrate and its dissociation thermodynamic functions

2000 ◽  
Vol 78 (9) ◽  
pp. 1204-1213 ◽  
Author(s):  
David N Glew
Keyword(s):  
Heat Capacity ◽  
Hydrogen Sulfide ◽  
Vapor Pressure ◽  
Standard Enthalpy ◽  
Approximate Formula ◽  
Saturation Vapor Pressure ◽  
Hydrate Dissociation ◽  
Quadruple Point ◽  
Heat Capacity Changes ◽  
Saturation Vapor

Literature data for the saturation vapor pressure P(hl1g) of hydrogen sulfide hydrate with water, at 43 temperatures between quadruple points Q(hs1l1g) at –0.4°C and Q(hl1l2g) at 29.484°C, are properly represented by a six-parameter equation to give a standard error (SE) of 0.13% on a hydrate pressure measurement of unit weight. Equilibrium hydrogen sulfide and water fugacities and the gas and aqueous phase compositions are derived using the Redlich–Kwong equation of state. Literature data for the saturation vapor pressure P(hs1g) of hydrogen sulfide hydrate with ice, at 15 temperatures between –1.249 and –21.083°C, are properly represented by a two-parameter equation to give a SE of 0.26% on a single hydrate pressure measurement. Quadruple point Q(hs1l1g) is evaluated at temperature –0.413° with SE 0.042°C and at pressure 94.7 with SE 0.26 kPa. Using the thermodynamic method, described for deuterium sulfide D-hydrate, the equilibrium fugacities of hydrogen sulfide are used to define 43 equilibrium constants Kp(h[Formula: see text]l1g) for hydrate dissociation into water and hydrogen sulfide gas. The temperature dependence of ln Kp(h[Formula: see text]l1g) is represented by a three-parameter thermodynamic equation which gives both values and standard errors (i) for Kp(h[Formula: see text]l1g), and for δHot(h[Formula: see text]l1g) and δCpot(h[Formula: see text]l1g), the standard enthalpy and heat capacity changes for hydrate dissociation and (ii) for n = r the approximate formula number of the hydrate H2S·nH2O at each experimental temperature. The formula H2S·6.119H2O with standard error 0.029H2O is found for hydrogen sulfide hydrate with water at lower quadruple point Q(hs1l1g) –0.413°C: an approximate formula H2S·5.869H2O with SE 0.026H2O is found at upper quadruple point Q(hl1l2g) 29.484°C. These estimates for the formula of hydrogen sulfide hydrate at its quadruple points are not significantly different from those found for the deuterium sulfide D-hydrate.Key words: clathrate hydrate of hydrogen sulfide, hydrogen sulfide hydrate, formula of hydrogen sulfide hydrate, thermodynamics of clathrate hydrate dissociation, dissociation equilibrium constant of hydrogen sulfide hydrate, standard enthalpy and heat capacity changes for dissociation of hydrogen sulfide hydrate.

Simultaneous determination of the heat capacity and the heat of the transitions for long-chain compounds with a heat-flux type DSC

1994 ◽  
Vol 233 (2) ◽  
pp. 175-185 ◽  
Author(s):  
Keiko Nakasone ◽  
Kanichiro Takamizawa ◽  
Kohzoh Shiokawa ◽  
Yoshiko Urabe
Keyword(s):  
Heat Flux ◽  
Heat Capacity ◽  
Simultaneous Determination ◽  
Chain Compounds ◽  
Long Chain
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