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Calculation of the phase diagram of n-alkanes (CnH2n+2) by the Landau mean field theory
Date
2022-05-01
Author
Yurtseven, Hasan Hamit
Kilit Dogan, E.
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We study the temperature T and concentration n (number of carbon atoms) dependence on the transitions of the liquid, rotator (RI, RII,RIII,RIVand RV) and crystal phases in n-alkanes (CnH2n+2). The Landau phenomenological model is used by expanding the free energy in terms of the lattice distortion parameter (D) and the tilt angle (θ) of the rotator (and crystal) phases with their quadratic coupling (D2θ2).The phase line equations are obtained with some approximations by considering the first order transitions between the phases in n-alkanes. By assuming the temperature and concentration dependence of some parameters in the Landau mean field expansion, the T-n phase diagram is established by using the observed data from the literature. Our results are satisfactory to explain the first order transition between the phases, mainly for the rotator and crystal phases in n-alkanes (CnH2n+2). The T-n phase diagrams can also be obtained for some other compounds of similar structures by the Landau phenomenological model as given in this study.
Subject Keywords
CnH2n+2
,
Landau phenomenological model
,
n-Alkanes
,
Phase diagram
URI
https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85122635649&origin=inward
https://hdl.handle.net/11511/96609
Journal
Fluid Phase Equilibria
DOI
https://doi.org/10.1016/j.fluid.2022.113377
Collections
Department of Physics, Article
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H. H. Yurtseven and E. Kilit Dogan, “Calculation of the phase diagram of n-alkanes (CnH2n+2) by the Landau mean field theory,”
Fluid Phase Equilibria
, vol. 556, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85122635649&origin=inward.