Wyniki wyszukiwania - BazTech

1

Internal pressure as a function of pressure for alkanols

Zorębski E.

Molecular and Quantum Acoustics

|

2007

|

Vol. 28

319-327

EN

Internal pressure as a function of pressure was estimated from the literature data for five chosen alkanols (ethanol, 1-pentanol, 3-pentanol, 3-methyl-3-pentanol, and 3-ethyl-3-pentanol). The data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

2

Internal Pressure as a Function of Pressure

Zorębski E.

Molecular and Quantum Acoustics

|

2006

|

Vol. 27

327-336

EN

Internal pressure as a function of pressure was estimated from literature data. Mostly, the data on isothermal compressibility and isobaric coefficient of thermal expansion obtained from acoustic method were used. The results shown that internal pressure can reaches a maximum for moderate pressures and then decreases more and more rapidly.

3

Speed Of Ultrasound And Thermodynamic Properties Of 1-Butanol In Binary Liquid Mixtures At 293.15 K

Bebek K.

Molecular and Quantum Acoustics

|

2005

|

Vol. 26

7-13

EN

The speeds of ultrasound in and densities of binary solutions of 1-butanol in hexane and cyclohexane were measured on the whole concentration range at 293.15 K. The experimental results in connection with literature data were used to calculate the isothermal compressibility coefficients and isochoric molar heat capacities for the pure components, as well as the excess molar volumes, excess adiabatic compressibilities, free volumes and the free intermolecular lengths for the binaries under test. The dependences of the excess properties on the mixture composition were compared and discussed in terms of the free intermolecular length and other factors affecting the solvation and self-association effects.

4

Internal Pressure Studies of Alcohols on the Basis of Ultrasonic Measurements

Zorębski B.

Molecular and Quantum Acoustics

|

2005

|

Vol. 26

317-326

EN

Internal pressure was calculated for some alcohols from experimental data on isothermal compressibility and isobaric coefficient of thermal expansion as well as by using of the mean molecular radius, in most cases from the speed of ultrasound data. The results differ quantitatively as well as qualitatively and suggest, that calculation of internal pressure by using of the mean molecular radius is incorrect (obtained values are unreliable and unacceptable).

5

Speed Of Sound And Related Thermodynamics Functions In And Ideal Mixture

Marczak W.

Molecular and Quantum Acoustics

|

2004

|

Vol. 25

193-200

EN

Deviation of experimental speeds of sound from the values predicted by different methods are sometimes interpreted in terms of molecular interactions. To this end, reference states must have clear physical meaning. In this work, two reference models were compared: a thermodynamically ideal solution and a model of additive passage times. Physical background of the differences was discussed. The role of an entropy changes in an medium compressed and decompressed by an acoustic wave was printed out. A hypothetical binary mixture of perfect gases served as an example of the discussed issue.

6

Ultrasonic and Volumetric Effects of Self-Association of Aliphatic Alcohols in Cyclohexane

Bebek K.

Molecular and Quantum Acoustics

|

2003

|

Vol. 24

17-22

EN

The speed of ulrtasound in and densities of binary solutions of ethanol, propan-2-ol and 2-methylopropan-2-ol in cyclohexane were measured on the whole concentration range at 293.15K. The excess molar volumes, free volumies, excess free volumes and adiabatic cmpressibility coeffcients, as well as the free intermolecular lenghts were determined for binaries. The dependance of the excess molar volumes and excess free volumes on the mixture composition were compared and discussed in terms of the intermolecular lenght and other factors afecting the self-association of alcohols and structural changes od the solvent.

7

Speeds of Ultrasound and Adiabatic Compressibilities of Binary Mixtures of 1,2-Ethanediol+1-Pentanol At 298.15k

Zorębski E.

Molecular and Quantum Acoustics

|

2003

|

Vol. 24

261-270

EN

The excess values of the molar adiabatic compressibility as well as adiabatic compressibility coefficient were estimated for binariy mixtires of 1,2-ethanediol+1-pentanol at 298.15K. Also deviations of the ultrasonic speed from the chosen additivity rules were determined. Both the excess quantities as well as the speed of ultrasound are expressed by the Redlich-Kister polynomials and discussed in terms of molecular interactions

8

Excess Volumes and Adiabatic Cmpressibilities of Binary Mixtures of Cyclohexanol + Glycerol at 298.15h

Zorębski E.

Molecular and Quantum Acoustics

|

2002

|

Vol. 23

463-472

EN

The excess values of the molar volume and molar adiabatic compressibility as well as adiabatic compressibility coefficient were estimated for binariey mixtures of cyclohexanol + glycerol at 298.15K. Also deviations of the ultrasonic speed from the chosen additivity rules were determined. Both the excess quantities as well as the speed of ultrasound deviations are expressed by the Redlich-Kister polynomials and aisscused in term of molecular interactions.