Surface Tension for 1,1,1-Trifluoroethane (R-143a), 1,1,1,2-Tetrafluoroethane (R-134a), 1,1-Dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-Dichloro-1,2,2,3,3-pentafluoropropane (R-225cb)

Higashi, Yukihiro; Shibata, T.; Okada, Masaaki

doi:10.1021/je960274v

Cited by 31 publications

(10 citation statements)

References 7 publications

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“…For data comparison, reference data available in the literature are also included in Figure . Zhu et al, Heide, and Higashi and Shibata measured the surface tension of R134a with the differential capillary rise method, for which an estimated uncertainty between (± 0.1 and ± 0.2) mN·m –1 can be found. Fröba measured the surface tension of R134a from (243 to 363) K also by SLS.…”

Section: Resultsmentioning

confidence: 99%

Liquid Viscosity and Surface Tension of R1234yf and R1234ze Under Saturation Conditions by Surface Light Scattering

Zhao

Fröba

et al. 2014

J. Chem. Eng. Data

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In the present study, surface light scattering (SLS) was used for the simultaneous determination of liquid kinematic viscosity and surface tension of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) and of trans-1,3,3,3-tetrafluoroprop-1-ene (R1234ze) under saturation conditions. A new SLS apparatus was built up and checked with 1,1,1,2-tetrafluoroethane (R134a), and a good agreement of our data from SLS with literature could be found. With the new apparatus, R1234yf and R1234ze were investigated in the temperature ranges between (293 and 365) K and between (295 and 373) K. For determination of the liquid kinematic viscosity the expanded uncertainties on a confidence level of more than 95 % (k = 2) are estimated to be ± 2 % for reduced temperatures T r (= T/T c) < 0.95, and ± 6 % for T r close to 0.99. For the surface tension, the expanded uncertainties are less than ± 1.5 % (k = 2) in the whole temperature range.

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Section: Resultsmentioning

confidence: 99%

Liquid Viscosity and Surface Tension of R1234yf and R1234ze Under Saturation Conditions by Surface Light Scattering

Zhao

Fröba

et al. 2014

J. Chem. Eng. Data

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“…The reproducibility and repeatability of the above mentioned measurement methods were confirmed with R134a for the medium temperature refrigerant R1243zf having the critical temperature blow 400 K and with R245fa for the high temperature refrigerants R1234ze(Z) and R1233zd(E) having the critical temperatures above 400 K. Figures 4 (a) and 4 (b) compare the surface tension between the present data and other data in literature for R134a and R245fa, respectively. For R134a, the measured surface tension provided by Chae et al (1990), Heide (1997), Higashi et al (1992), Higashi et al (1997), and Zhu et al (1993), and also the calculated surface tension by REFPROP 9.1 were compared in Figure 4 (a). For R245fa, the data provided by Schmidt et al (1996), Lin et al (2003), Zhelezny et al (2007), and Geller et al (1999), and also the calculated surface tension were compared in Figure 4 data from the calculated surface tension by using REFPROP 9.1.…”

Section: Validity Assessment For the Measurement Methodsmentioning

confidence: 99%

Surface tension of low GWP refrigerants R1243zf, R1234ze(Z), and R1233zd(E)

Kondou

Nagata

Nii

et al. 2015

International Journal of Refrigeration

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The surface tension of R1243zf, R1234ze(Z), and R1233zd(E) were measured at temperatures from 270 K to 360 K by an experimental apparatus based on the differential capillary rise method. The deviation between the measured surface tension of R134a and R245fa and the calculated surface tension with REFPROP 9.1 (Lemmon et al., 2013) was ±0.13 mN m-1 , which is less than the estimated propagated uncertainty in surface tension of ±0.2 mN m-1. Eleven points, thirteen points, and ten points of surface tension data were provided for R1243zf, R1234ze(Z), and R1233zd(E), respectively, in this paper. The measured data and the estimated surface tension using the methods of Miller (1963), Miqueu et al. (2000), and Di Nicola et al. (2011) agree within the standard deviation of ±0.43 mN m-1. The empirical correlations that represent the measured data within ±0.14 mN m-1 were proposed for each refrigerant.

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“…Besides evaluating the tail−solvent interactions, surfactant interfacial activity/balance must also be addressed to design surfactants for fluid−fluid interfaces such as that of HFA134a and water. The surface tension of HFA134a has been the subject of several investigations. ,,,− We have also recently reported a combined atomistic molecular dynamics simulation and tensiometric study of the bare HFA134a|W interface…”

Section: Introductionmentioning

confidence: 99%

Surfactant Design for the 1,1,1,2-Tetrafluoroethane−Water Interface: ab initioCalculations andin situHigh-Pressure Tensiometry

et al. 2006

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In situ high-pressure tensiometry and ab initio calculations were used to rationally design surfactants for the 1,1,1,2-tetrafluoroethane-water (HFA134a|W) interface. Nonbonded pair interaction (binding) energies (E(b)) of the complexes between HFA134a and candidate surfactant tails were used to quantify the HFA-philicity of selected moieties. The interaction between HFA134a and an ether-based tail was shown to be predominantly electrostatic in nature and much more favorable than that between HFA134a and a methyl-based fragment. The interfacial activity of (i) amphiphiles typically found in FDA-approved pressurized metered-dose inhaler (pMDI) formulations, (ii) a series of nonionic surfactants with methylene-based tails, and (iii) a series of nonionic surfactants with ether-based tails was investigated at the HFA134a|W interface using in situ tensiometry. This is the first time that the tension of the surfactant-modified HFA134a|W interface has been reported in the literature. The ether-based surfactants were shown to be very interfacially active, with tension decreasing by as much as 27 mN.m(-)(1). However, the methyl-based surfactants, including those from FDA-approved formulations, did not exhibit high activity at the HFA134a|W interface. These results are in direct agreement with the E(b) calculations. Significant differences in interfacial activity are noted for surfactants at the 2H,3H-perfluoropentane (HPFP)|water and HFA134a|W interfaces. Care should be taken, therefore, when results from the mimicking solvent (HPFP) are extrapolated to HFA134a-based systems. The results shown here are of relevance in the selection of surfactants capable of forming and stabilizing reverse aqueous aggregates in HFA-based pMDIs, which are promising formulations for the systemic delivery of biomolecules to and through the lungs.

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Surface Tension for 1,1,1-Trifluoroethane (R-143a), 1,1,1,2-Tetrafluoroethane (R-134a), 1,1-Dichloro-2,2,3,3,3-pentafluoropropane (R-225ca), and 1,3-Dichloro-1,2,2,3,3-pentafluoropropane (R-225cb)

Cited by 31 publications

References 7 publications

Liquid Viscosity and Surface Tension of R1234yf and R1234ze Under Saturation Conditions by Surface Light Scattering

Liquid Viscosity and Surface Tension of R1234yf and R1234ze Under Saturation Conditions by Surface Light Scattering

Surface tension of low GWP refrigerants R1243zf, R1234ze(Z), and R1233zd(E)

Surfactant Design for the 1,1,1,2-Tetrafluoroethane−Water Interface: ab initioCalculations andin situHigh-Pressure Tensiometry

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