Wyniki wyszukiwania - Biblioteka Nauki

1

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

100%

Zorębski E.

|

2003

|

tom 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

2

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

100%

Zorębski E.

|

tom 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.

3

Effent of Temperature on Speed of Utrasound Ind Adiabatic Comressibility of Binary Moxtures of 1,2-Ethanediol+1-Pentanol

100%

Zorębski E.

|

tom Vol. 25

291-296

EN

The excess values of the molar adiabatic compressibility as well as adiabatic compressibility coefficeint were estimated for binary mixtures of 1,2-ethanediol+1-pentanol at the temperatures (293.15, 303.15, 308.15 and 313.15) K. Alsko deviations of the ultrasonic speed from the chosen additivity rules were determinated. Together with the previous result for T = 298.15K (E. Zorębski, Mol.Quant Acoust.,24 261-270 (2003)), the effect of temperature on speed of ultrasound and adiabatic compressibility is studied. It appears that both excesses decrease with increasing temprature whereas deviations of ultrasonic speed have opposite temperature dependencies.

4

Absorpcja ultradźwięków w binarnych mieszaninach 1-butanol + 1,3-butanodiol w temperaturze 298.15 k

63%

Zorębski E. , Zorębski M.

|

tom Vol. 19

297-300

EN

The absorption of ultrasound in binary mixtures of l-butanol with 1,3-butanedioI andin the pure components was measured at 298.15 K. The both components , i.e. l-butanol (GC>99.5%, H2O < 0.1%, Merck, RFN) and 1,3-butanediol (GC>99%, H2O < 0.2%, Merck-Schuchardt, RFN) were used without further purification. Only the water content was checked by the Karl Fischer dead-point method and found to be no more than 0.06% vol. and 0.01% j vol., respectively. The mixtures were prepared by weighing. The absorption of ultrasound was measured within the frequency range 10-80 MHz using a pulse transmission method. The measuring set designed and constructed at our laboratory f was used. The accuracy of the measurements was estimated to be š5%. For both pure components and all investigated mixtures the quotient alfa/f2 is independent of frequency (within the investigated frequency range); the relaxation times must be | consequently distinctly smaller than (2 . pi . 80 MHz)'1 = 2-10-9 s. The concentration dependence of the mean ultrasonic absorption alfa/f2 is monotonie, alfa/2l increased with increasing concentration of 1,3-butanediol.

5

Acoustic Nonlinearity Parameter B/A, Internal Pressure, and Acoustic Impedance Determined at Pressures up to 100 MPa for 1-Ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide

51%

Zorębski E. , Zorębski M. , Dzida M.

Archives of Acoustics

|

2016

|

tom Vol. 41, No. 1

59--66

EN

The nonlinearity parameter B/A, internal pressure, and acoustic impedance are calculated for a room temperature ionic liquid, i.e. for 1-ethyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl] imide for temperatures from (288.15 to 318.15) K and pressures up to 100 MPa. The B/A calculations are made by means of a thermodynamic method. The decrease of B/A values with the increasing pressure is observed. At the same time B/A is temperature independent in the range studied. The results are compared with corresponding data for organic molecular liquids. The isotherms of internal pressure cross at pressure in the vicinity of 70 MPa, i.e. in this range the internal pressure is temperature independent.