DOI: 10.1063/1.438610. Coexistence curve of the binary mixture nitroethane

Coexistence curve of the binary mixture nitroethane–isooctane

10.1063/1.438610

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

The coexistence curve of the nitroethane–isooctane mixture is reported. Since the mixture is composed of liquids of nearly perfectly matched refractive indices, special care had to be taken. Two experimental techniques were used: (i) A visual method with 32 samples of different mass function c allowing the exponent β (0.318±0.006) the amplitude B (1.83±0.016 in Δc=Bεβ) and the critical composition (isooctane mass fraction 0.5350±6×10−4) to be obtained. (ii) An interferometer method on a single critical sample, giving β=0.31±0.02, the refractive index derivatives (∂n/∂T)p,φ=−(4.99±0.02) ×10−4 and (∂n/∂φ)p,T= (1.38±0.05) ×10−3 and the refractive index difference n1−n2= (0.95±0.04) ×10−3. The interferometer method is influenced by long time-scale relaxation effects. The value of the exponent β is found to be close to the three-dimensional Ising value and is nearly insensitive, as is also the quality of the fit, to the choice of the order parameter (volume, mass, or mole fraction). The coexistence curve was found to be entirely symmetrical when the mass fraction was used, and we did not find evidence of deviations from the rectilinear diameter. Nonanalytical corrections were necessary only with the mole fraction parameter when the value β=0.325 was imposed.

Bibliography

Beysens, D. (1979). Coexistence curve of the binary mixture nitroethaneâisooctane. The Journal of Chemical Physics, 71(6), 2557â2565.

Authors 1

D. Beysens (first)

References 31 Referenced 38

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Dates

Type	When
Created	22 years, 6 months ago (Feb. 27, 2003, 4:39 p.m.)
Deposited	1 year, 6 months ago (Feb. 9, 2024, 3:17 p.m.)
Indexed	1 year, 6 months ago (Feb. 10, 2024, 2:41 a.m.)
Issued	45 years, 11 months ago (Sept. 15, 1979)
Published	45 years, 11 months ago (Sept. 15, 1979)
Published Print	45 years, 11 months ago (Sept. 15, 1979)

Funders 0

None

BibTeX

@article{Beysens_1979, title={Coexistence curve of the binary mixture nitroethane–isooctane}, volume={71}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.438610}, DOI={10.1063/1.438610}, number={6}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Beysens, D.}, year={1979}, month=sep, pages={2557–2565} }

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  "abstract": "<jats:p>The coexistence curve of the nitroethane\u2013isooctane mixture is reported. Since the mixture is composed of liquids of nearly perfectly matched refractive indices, special care had to be taken. Two experimental techniques were used: (i) A visual method with 32 samples of different mass function c allowing the exponent \u03b2 (0.318\u00b10.006) the amplitude B (1.83\u00b10.016 in \u0394c=B\u03b5\u03b2) and the critical composition (isooctane mass fraction 0.5350\u00b16\u00d710\u22124) to be obtained. (ii) An interferometer method on a single critical sample, giving \u03b2=0.31\u00b10.02, the refractive index derivatives (\u2202n/\u2202T)p,\u03c6=\u2212(4.99\u00b10.02) \u00d710\u22124 and (\u2202n/\u2202\u03c6)p,T= (1.38\u00b10.05) \u00d710\u22123 and the refractive index difference n1\u2212n2= (0.95\u00b10.04) \u00d710\u22123. The interferometer method is influenced by long time-scale relaxation effects. The value of the exponent \u03b2 is found to be close to the three-dimensional Ising value and is nearly insensitive, as is also the quality of the fit, to the choice of the order parameter (volume, mass, or mole fraction). The coexistence curve was found to be entirely symmetrical when the mass fraction was used, and we did not find evidence of deviations from the rectilinear diameter. Nonanalytical corrections were necessary only with the mole fraction parameter when the value \u03b2=0.325 was imposed.</jats:p>",
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