Dielectric Measurements at High Pressures and Low Temperatures

Ledwig, R.; Würflinger, A.

doi:10.1524/zpch.1982.132.1.021

Cited by 15 publications

(7 citation statements)

References 18 publications

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“…Experimental densities agree well with the previously reported literature data. − They are usually slightly higher than the data of Machado and Streett 18 and slightly lower than those of Sun et al In both cases the maximum relative deviations do not exceed 0.04 %. The data of Hrubý et al are higher, with the maximum deviations equal to 0.07 %.…”

Section: Methodssupporting

confidence: 89%

“…The data of Hruby ´et al 20 are higher, with the maximum deviations equal to 0.07 %. Only the data of Ledwig and Wu ¨rflinger 17 are outstanding, also with respect to all of the data reported in the literature. At 283.15 K they deviate from the presented data over -0.20 % to +0.10 %.…”

Section: Methodsmentioning

confidence: 90%

“…between the measured and literature density values of methanol at 298.15 K as a function of pressure. The literature data are taken from O, ref ; ·, ref ; ▵, ref ; □, ref ; ◆, ref . Dotted interpolation lines visualize the observed trends.…”

Section: Methodsmentioning

confidence: 99%

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Densities and Excess Volumes of the 1,3-Dimethylimidazolium Methylsulfate + Methanol System at Temperatures from (313.15 to 333.15) K and Pressures from (0.1 to 25) MPa

2007

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Densities of pure 1,3-dimethylimidazolium methylsulfate ionic liquid [MMIM][CH3SO4] and its mixtures with methanol have been measured with an accuracy of ±0.2 kg·m-3 over a temperature range from (313.15 to 333.15) K and a pressure range from (0.1 to 25) MPa using a vibrating tube densimeter. The isothermal compressibilities, isobaric expansivities, and excess volumes have been calculated. The uncertainties of these properties have been estimated to be ±0.05 GPa-1, ±0.2·10-4 K-1, and ±0.1 cm3·mol-1. The exceptionally strong influence of pressure and temperature on the excess volumes has been observed.

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Section: Methodssupporting

confidence: 89%

Section: Methodsmentioning

confidence: 90%

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Densities and Excess Volumes of the 1,3-Dimethylimidazolium Methylsulfate + Methanol System at Temperatures from (313.15 to 333.15) K and Pressures from (0.1 to 25) MPa

2007

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“…Table 1 summarizes our experimental results of κ T . Three selected isotherms are compared with available results [1][2][3][4][5][6][7][8][9]11,12,16 in Figure 1. It must be emphasized that data from other sources are calculated from isothermal F(p) measurements.…”

Section: Isothermal Behawior Of the Compressibility In Liquidmentioning

confidence: 99%

“…There have been several efforts describing the effect of temperature and pressure on the hydrogen bond strength of methanol. A number of theoretical and experimental studies have been performed to understand the thermodynamic, structural, and dynamic properties of methanol at high densities, among others, correlations of the equation of state; − measurements of the dielectric constant, , refractive index, viscosity, , and elastic properties; , and computer simulations. , However, efforts to understand the high-pressure behavior of methanol have been focused at room temperature and above. The limited number of reliable high-pressure measurements available to date at temperatures close to the melting line is somewhat surprising.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Properties of Compressed Liquid Methanol in the Vicinity of the Freezing Line

et al. 2007

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We present direct measurements of the isothermal compressibility (κ T ) and thermal expansion coefficient (α p ) of liquid methanol using an expansion technique. The measurements of κ T were carried out along six isotherms from (208.17 to 298.16) K at pressures up to 101 MPa. For α p , we have measured four isobars from (0.59 to 80.03) MPa from 195 K up to 300 K. Our experimental results of α p (T) for the 0.59 MPa isobar exhibit a minimum around 224 K. A clear shift of the minimum to higher temperatures is observed as the pressure increases along the different isobars. Interestingly, the minima for the isobars of α p (ρ) take place within a narrow range of densities, around 26.5 mol·dm-3 (about 3.15 times the critical density).

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Ultraschalluntersuchungen in flüssigen und plastischen Phasen

Kreutzenbeck

Ledwig

Würflinger

1983

Ber Bunsenges Phys Chem

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Different devices have been developed for ultrasonic measurements at atmospheric and elevated pressures up to 1 kbar. The velocities of sound for liquid toluene, 2,3‐dimethylbutane, cyclohexane, and camphene have been determined. In the case of 2,3‐dimethylbutane also preliminary absorption measurements at elevated pressures have been performed, according to which the activation volume for the hindered internal rotation is negligible. Furthermore some plastic phases have been studied. The velocities of sound (longitudinal mode) of cyclohexane and camphene increase considerably on freezing in contradiction to the findings of others. Additional measurements of the transverse modes allow a rough estimation of the elastic stiffness constants.

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Dielectric Measurements at High Pressures and Low Temperatures

Cited by 15 publications

References 18 publications

Densities and Excess Volumes of the 1,3-Dimethylimidazolium Methylsulfate + Methanol System at Temperatures from (313.15 to 333.15) K and Pressures from (0.1 to 25) MPa

Densities and Excess Volumes of the 1,3-Dimethylimidazolium Methylsulfate + Methanol System at Temperatures from (313.15 to 333.15) K and Pressures from (0.1 to 25) MPa

Thermodynamic Properties of Compressed Liquid Methanol in the Vicinity of the Freezing Line

Ultraschalluntersuchungen in flüssigen und plastischen Phasen

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