Relative Permittivity Measurements of Trifluoromethyl Methyl Ether and Pentafluoroethyl Methyl Ether

and, Wayne Eltringham; Catchpole, Owen J.

doi:10.1021/je7000446

Cited by 5 publications

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are numerous models, some with theoretical basis, which have been used to represent the relative permittivity as a function of density, and for polar fluids, these expressions that correlate the total molar polarizability have been discussed by Böttcher . One of these expressions is the equation of Kirkwood and Onsager, and another adopted by Eltringham and Catchpole is an adaptation of the Clausius−Mossotti equation . For measurements of ϵ′ as a function of temperature and pressure, an alternative empirical expression was reported by Owen and Brinkley .…”

Section: Resultsmentioning

confidence: 99%

Determination of the Relative Permittivity, ϵ′, of Methylbenzene at Temperatures between (290 and 406) K and Pressures below 20 MPa with a Radio Frequency Re-Entrant Cavity and Evaluation of a MEMS Capacitor for the Measurement of ϵ′

2008

View full text Add to dashboard Cite

The relative electric permittivity of liquid methylbenzene has been determined with an uncertainty of 0.01 % from measurements of the resonance frequency of the lowest order inductive-capacitance mode of a re-entrant cavity (J. Chem. Thermodyn. 2005, 37, 684–691) at temperatures between (290 and 406) K and pressures below 20 MPa and at T = 297 K with a MicroElectricalMechanical System (MEMS) interdigitated comb capacitor. For the re-entrant cavity, the working equations were a combination of the expressions reported by Hamelin et al. (Rev. Sci. Instrum. 1998, 69, 255−260) and a function to account for dilation of the resonator vessel walls with pressure that was determined by calibration with methane (J. Chem. Eng. Data 2007, 52, 1660–1671). The results were represented by an empirical equation reported by Owen and Brinkley (Liq. Phys. Rev. 1943, 64, 32–36) analogous to the Tait equation (Br. J. Appl. Phys. 1967, 18, 965–977) with a standard (k = 1) uncertainty of 0.33 %. The values reported by Mospik (J. Chem. Phys. 1969, 50, 2559–2569) differed from the interpolating equation by <± 0.2 % at temperatures that overlap ours; extrapolating the smoothing expression to T = 223 K, a temperature of 40 K below the lowest used for the measurements, provided values within ± 0.6 % of the data reported by Mospik. A parallel plate capacitor is described that was formed from interdigitated combs that were fabricated by the techniques of MEMS. This device has capacitances arising from fringing fields that contributed about 50 % to the total capacitance of about 3 pF. The fringing field was accommodated with a calibration with octane using the data of Scaife and Lyons (Proc. R. Soc. London A 1980 , 370, 193–211, SUP 10031). The values of the relative permittivity of methylbenzene obtained with the MEMS at T = 297 K and p < 40 MPa deviated systematically from the smoothing equation based on the re-entrant cavity data by between −0.9 % at p = 7 MPa and 0.5 % at p = 42 MPa within about 5 times the estimated expanded (k = 2) uncertainty of the measurements obtained with the MEMS.

show abstract

Section: Resultsmentioning

confidence: 99%

Determination of the Relative Permittivity, ϵ′, of Methylbenzene at Temperatures between (290 and 406) K and Pressures below 20 MPa with a Radio Frequency Re-Entrant Cavity and Evaluation of a MEMS Capacitor for the Measurement of ϵ′

2008

View full text Add to dashboard Cite

show abstract

“…In conclusion, the dielectric response experimental results have shown that the real permittivities of both HFE (>80 Hz) and FK are negatively correlated with increasing temperature. The correlation between real permittivity and temperature is true for most hydrofluorocarbon (HFC) class cooling fluids such as 1,1,1,2‐tetrafluoroethane (HFC‐134a), pentafluoroethane (HFC‐125) and trifluoromethyl methyl ether (HFE‐143a) [26, 27]. Furthermore, dielectric spectroscopy results show a qualitatively different behaviour between HFE and FK fluids.…”

Section: Discussionmentioning

confidence: 99%

Effect of temperature on the dielectric properties of hydrofluoroethers and fluorinated ketone

Chippendale

Lewin

et al. 2019

IET Science, Measurement & Technology

View full text Add to dashboard Cite

Static dielectric constant of trifluoromethoxymethane

Wohlfarth¹

2015

Static Dielectric Constants of Pure Liquids and Binary Liquid Mixtures

View full text Add to dashboard Cite

Relative Permittivity Measurements of Trifluoromethyl Methyl Ether and Pentafluoroethyl Methyl Ether

Cited by 5 publications

References 23 publications

Determination of the Relative Permittivity, ϵ′, of Methylbenzene at Temperatures between (290 and 406) K and Pressures below 20 MPa with a Radio Frequency Re-Entrant Cavity and Evaluation of a MEMS Capacitor for the Measurement of ϵ′

Determination of the Relative Permittivity, ϵ′, of Methylbenzene at Temperatures between (290 and 406) K and Pressures below 20 MPa with a Radio Frequency Re-Entrant Cavity and Evaluation of a MEMS Capacitor for the Measurement of ϵ′

Effect of temperature on the dielectric properties of hydrofluoroethers and fluorinated ketone

Static dielectric constant of trifluoromethoxymethane

Contact Info

Product

Resources

About