scholarly journals -Physical Properties of Fluids and Their Precise Measurement Techniques under High Pressure-Isochoric Heat Capacity Measurements for Fluids under High Pressures

2005 ◽  
Vol 15 (3) ◽  
pp. 209-217
Author(s):  
Noboru KAGAWA
Keyword(s):  
Heat Capacity ◽  
High Pressure ◽  
Physical Properties ◽  
Precise Measurement ◽  
High Pressures ◽  
Measurement Techniques ◽  
Isochoric Heat Capacity ◽  
Heat Capacity Measurements

Isochoric Heat-Capacity Measurements for Pure Methanol in the Near-Critical and Supercritical Regions

2007 ◽  
Vol 28 (1) ◽  
pp. 163-193 ◽  
Author(s):  
N. G. Polikhronidi ◽  
I. M. Abdulagatov ◽  
G. V. Stepanov ◽  
R. G. Batyrova
Keyword(s):  
Heat Capacity ◽  
Isochoric Heat Capacity ◽  
Heat Capacity Measurements ◽  
Pure Methanol

Liquid−Liquid−Vapor, Liquid−Liquid, and Liquid−Vapor Phase Transitions in Aqueousn-Hexane Mixtures from Isochoric Heat Capacity Measurements

2001 ◽  
Vol 46 (6) ◽  
pp. 1556-1567 ◽  
Author(s):  
Ibragimkhan K. Kamilov ◽  
Gennadii V. Stepanov ◽  
Ilmutdin M. Abdulagatov ◽  
Anvar R. Rasulov ◽  
Elena I. Milikhina
Keyword(s):  
Heat Capacity ◽  
Phase Transitions ◽  
Vapor Phase ◽  
Isochoric Heat Capacity ◽  
Heat Capacity Measurements ◽  
Liquid Vapor ◽  
Vapor Liquid

High Pressure Materials Physics Research at UNLV

2014 ◽  
Vol 783-786 ◽  
pp. 1836-1838
Author(s):  
Andrew L. Cornelius ◽  
Brant Abeln ◽  
Daniel Antonio ◽  
Jason Baker ◽  
Patricia E. Kalita ◽  
...  
Keyword(s):  
High Pressure ◽  
High Pressures ◽  
Ambient Pressure ◽  
Strongly Correlated ◽  
Electron Systems ◽  
Strongly Correlated Electron ◽  
Correlated Electron Systems ◽  
Correlated Electron ◽  
High Pressure Studies ◽  
Heat Capacity Measurements

High-pressure studies on strongly correlated-electron systems allow the study of the relationship between structural, elastic, electronic, and magnetic properties of d-and f-band systems. The High Pressure Science and Engineering Center (HiPSEC) at UNLV performs interdisciplinary research on a wide variety of materials at high pressures. One such system, YbB2 displays antiferromagnet order at ambient pressure. We present heat capacity measurements at high magnetic fields to 9 T and structural measurement at pressures up to 5 GPa on YbB2.

scholarly journals High - temperature and high-pressure (p, ρ, T) measurements and derived thermodynamic properties of 1-octyl-3-methylimidazolium hexafluorophosphate

2020 ◽  
Vol 85 (2) ◽  
pp. 237-250
Author(s):  
Javid Safarov ◽  
Christoffer Bussemer ◽  
Abilgani Aliyev ◽  
Gorica Ivanis ◽  
Mirjana Kijevcanin ◽  
...  
Keyword(s):  
Heat Capacity ◽  
High Pressure ◽  
High Temperature ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
High Pressures ◽  
Type Equation ◽  
Isentropic Compressibility ◽  
Primary Data ◽  
Capacity Data

Densities of ionic liquid (IL) 1-octyl-3-methylimidazolium hexafluorophosphate [OMIM][PF6] at high temperatures and high pressures were measured. The measurements were made along 10 isotherms over a temperature range T = 278.15 to 413.15 K, at pressures up to 140 MPa by means of an Anton Paar DMA HPM vibration tube densimeter (VTD). The combined expanded relative uncertainties of the density, pressure and temperature measurements at the 95 % confidence level with a coverage factor of k = 2 are estimated to be 0.03 to 0.08 % (depending on temperature and pressure ranges), 0.1 %, and 0.015 K, respectively. We have critically assessed all of the reported high-pressure densities for [OMIM][PF6], together with the presented results, in order to carefully select primary data for development of a reference wide-ranging equation of state. Values of ??T isobars curvatures, (?2?/?T2)?, were estimated using the present high-pressure ?-T measurements and they were pretty low (0.78?10-7 to 1.50??10-7 m3 kg-1 K-1), indicating that the heat capacity of [OMIM][PF6] very weakly depends on pressure, since (?Cp/?P)T ?(?2?/?T2)?. Density data were fitted to the modified Tammann?Tait equation and the multiparametric polynomial-type equation of state (EOS) for the IL was developed using the measured high-pressure and high-temperature (p, ?, T) data. This EOS, together with our previous measured heat capacity data at atmospheric pressure, was used to calculate high-pressure and high-temperature derived thermodynamic properties, such as isothermal compressibility,isentropic compressibility, isobaric thermal expansion coefficient, heat capacities,etc.

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