Perfect families of mixed crystals: the ‘‘ordered’’ crystalline forms of n-alkanes

Literature Information

Publication Date 2000-03-09
DOI 10.1039/A909731G
Impact Factor 3.676
Authors

Fazil Rajabalee, Valérie Metivaud, Harry A. J. Oonk, Denise Mondieig, Peter Waldner


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Abstract

The experimental systems considered in this paper are isobaric binary mixed crystals of n-alkanes in the crystalline forms Op, Mdci and Mdep, which, on the temperature scale, precede mixed crystals in the rotator forms. The properties studied are the thermodynamic mixing properties, actually the excess enthalpy and excess entropy. For 14 binary systems in the range C17 to C28, quantitative thermodynamic data have been obtained by studying the transition to the rotator forms, for which the thermodynamic mixing properties had been determined earlier. The most important outcome of the investigation is that the complete set of systems is characterised by (i) a uniform ratio between excess enthalpy and excess entropy, having the value of 335 K, and (ii) a uniform dependence of the excess enthalpy on relative difference between number of carbon atoms in the molecules of the components of the system.

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DOI: 10.1039/C2AN90065C

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

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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