The C19H39OH–C20H41OH system: Experimental phase diagram and thermodynamic modelling

Literature Information

Publication Date 2002-04-17
DOI 10.1039/B111635E
Impact Factor 3.676
Authors

L. Ventolà, T. Calvet, M. A. Cuevas-Diarte, D. Mondieig, H. A. J. Oonk


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Abstract

The experimental phase diagram of the C19H39OH–C20H41OH system has been determined and, subsequently, subjected to thermodynamic modelling. The pure components of the system are polymorphic. At low temperature they have monoclinic phases that are different: a γ phase (C2/c, Z = 8) for C20H41OH and a β phase (P21/c, Z = 8) for C19H39OH. At high temperature, a few degrees before melting, the two components have the same monoclinic phase R′IV (C2/m, Z = 4). The solid–liquid equilibrium can be explained by simple isomorphism, and the solid–solid equilibria by crossed isodimorphism. The solid–liquid domain ([R′IV + L]) is very narrow (less than 0.2 K), and the enthalpy of fusion is high enough to consider the alloys of the system as promising candidates for thermal energy storage. Three solid–solid domains were observed ([β + R′IV], [γ + R′IV] and [β + γ]), these are related by a peritectoid invariant at ≈323 K, with compositions from 55 and 80 mol% in C20H41OH. One of the domains ([β + R′IV]) has a minimum at ≈321 K and about 40 mol% in C20H41OH. The calculated phase diagram, obtained by thermodynamic analysis, is in full agreement with the experimental one.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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