n-hexane as a model for compressed simple liquids

Randzio, Stanisław L.; Grolier, J.-P.E.; Quint, Jacques R.; Eatough, Delbert J.; Lewis, Edwin A.; Hansen, Lee D.

doi:10.1007/bf01563706

Cited by 115 publications

(133 citation statements)

References 34 publications

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“…The minima of the isobaric heat capacity on the isotherms is observed in both simple and complex liquids, such as liquid carbon dioxide and n-butane, 33 hexane, 34 methane, 35 quinolone, 36 and coal-derived liquids. 37,38 It was found that there is a crossing point in isobaric thermal expansion coefficients along the isothermal lines in all of these systems.…”

Section: Discussionmentioning

confidence: 99%

Thermodynamic properties of liquid sodium under high pressure

Zhang

Sun

et al. 2017

AIP Advances

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Acquiring reliable thermodynamic properties in liquid metals at high pressure and temperature is still a challenge in both experiment and theory. Equation of state (EoS) offers an alternative approach free of many of the difficulties. Here using the EoS of a power law form we obtained the thermodynamic properties of liquid sodium under pressure along the isothermal lines, including isothermal buck modulus, thermal expansion coefficient, Grüneisen parameter, and Anderson-Grüneisen parameter. The results are in excellent agreement with available experimental data measured by a piezometer at high temperature and high pressure and sound velocity measurement with pulse-echo technique. We found that the pressure derivative of the isothermal bulk modulus at zero pressure is a monotonic function of temperature and has a value around 4. In addition, unexpected crossing points were found in the isobaric thermal expansion coefficient and Grüneisen parameter; and a minimum in the isobaric heat under isothermal compression was also observed. While some of these detailed predictions are yet to be confirmed by further experiment, our results suggest that the power law form may be a more suitable choice for the EoS of liquids metals.

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Section: Discussionmentioning

confidence: 99%

Thermodynamic properties of liquid sodium under high pressure

Zhang

Sun

et al. 2017

AIP Advances

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“…However, these values of V o-corr allow for a qualitative discussion of TTBB retention on the OJ phase because they were smaller than those at the reference temperature (258C). It has been reported that isobaric thermal expansivities of Hex decreased with an increase in pressure [29]. By Eq.…”

Section: Effect Of Pressure and Temperaturementioning

confidence: 94%

Hold‐up volume and its application in estimating effective phase ratio and thermodynamic parameters on a polysaccharide‐coated chiral stationary phase

Lao¹,

Gan

2007

J of Separation Science

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As an "unretained" marker, 1,3,5-tri-tert-butylbenzene (TTBB) has been commonly used to measure the hold-up volume. Despite many racemates have been resolved on Chiralcel OJ column, the hold-up volume of the column is still not well characterized. The aim of this work was to evaluate the chromatographic behavior of TTBB on the OJ column, and its application in estimating the effective phase ratio and thermodynamic parameters. The hold-up volume was affected not only by the mobile phase composition but also the solvents used for dissolving TTBB. A higher concentration of TTBB (0.500 mg/mL) showed a better reproducibility than when used at a lower concentration. After correction for thermal expansion of the mobile phase, TTBB was found to have slight retention on the OJ phase. The effective phase ratio increased with an increase in the temperature and decrease in the strength of the mobile phase. The enthalpy and entropy of enantiomers of imidazolinone herbicides were independent of the temperature in a linear van't Hoff plot when the effective phase ratio was changed. This study shows that, based on the hold-up volume from TTBB, thermodynamic evaluation with parameters derived from the distribution constant is valuable for understanding chromatographic retention and enantioseparation mechanisms of chiral analytes.

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“…In Fig. 4a is presented a set of isotherms of ~p for n-hexane, obtained from a correlation equation based on experimental data from various laboratories [15]. At low pressures, below the pressure of the crossing of isotherms, thermal expansivity increases with increasing temperature, but at higher pressures (experimentally investigated up to 700 MPa), Ctp decreases with temperature increases.…”

Section: A Model Example For Scientific Applicationsmentioning

confidence: 98%

Scanning transitiometry for science and industry

Randzio

1997

Journal of Thermal Analysis

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Basic principle of scanning transitiometry are presented. The new technique is based on a simultaneous recording of both mechanical and thermal variables of a thermodynamic transition induced by scanning one independent variable (p, T or V) while the other independent variable is being kept constant. Examples are given for applications of the new technique in materials science such as simultaneous determination of % and K x as a function of pressure for a crystalline polyethylene at 363 K, simultaneous determination of heat and volume of transition for isothermal fusion of polyethylene at 423 K and tbr isobaric phase changes in 1--0S5 liquid crysta! (4-n-pentyl-phenylthiol-4'-decycloxybenzoate) at 134.6 MPa. A special attention is paid to the determination of Ctp for dense liquids, theoretical interpretation of its pressure-temperature oehavior and the use of the new technique in verification of equations of state tbr dense condensed systems.

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n-hexane as a model for compressed simple liquids

Cited by 115 publications

References 34 publications

Thermodynamic properties of liquid sodium under high pressure

Thermodynamic properties of liquid sodium under high pressure

Hold‐up volume and its application in estimating effective phase ratio and thermodynamic parameters on a polysaccharide‐coated chiral stationary phase

Scanning transitiometry for science and industry

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