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Intermediate phases during solid to liquid transitions in long-chain n-alkanes

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Abstract

The solid to liquid phase transition of n-alkanes with more than ten carbon atoms is an interesting phenomenon relevant to many fields, from cosmetics to automotive. Here we report Raman spectroscopy of tetradecane, pentadecane and hexadecane as a function of temperature. In order to gain information on the structural changes that the hydrocarbons undergo during melting, and to determine the temperature and the speed at which the phase change occurs, their temperature-dependent Raman spectra are acquired. The spectra are analysed not only with respect to frequency shifts, band widths, and intensity ratio of certain bands, but also using a principal component analysis. The spectroscopic data suggest that the solid to liquid phase transition in hexadecane, differently from tetradecane and pentadecane, is almost instantaneous. Tetradecane shows a slightly faster transition than pentadecane. In addition, a rotator phase as an intermediate state between the liquid and crystalline solid phases is identified in pentadecane. Different characteristic features in the solid spectra of the hydrocarbons relate tetradecane and hexadecane to a tryclinic crystalline structure, and pentadecane to an orthorhombic structure.

Graphical abstract: Intermediate phases during solid to liquid transitions in long-chain n-alkanes

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Publication details

The article was received on 07 Mar 2017, accepted on 03 May 2017 and first published on 11 May 2017


Article type: Paper
DOI: 10.1039/C7CP01468F
Citation: Phys. Chem. Chem. Phys., 2017, Advance Article
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    Intermediate phases during solid to liquid transitions in long-chain n-alkanes

    S. Corsetti, T. Rabl, D. McGloin and J. Kiefer, Phys. Chem. Chem. Phys., 2017, Advance Article , DOI: 10.1039/C7CP01468F

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