Semifluorinated alkanes and alkanes : a phase study of the perfluorohexyloctane - tetradecane system

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Semifluorinated alkanes and alkanes : a phase study of the perfluorohexyloctane - tetradecane system

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Publication Article, peer reviewed scientific
Title Semifluorinated alkanes and alkanes : a phase study of the perfluorohexyloctane - tetradecane system
Author Runnsjo, Anna ; Kocherbitov, Vitaly ; Graf, Gesche ; Pettigrew, Anthony ; Scherer, Dieter ; Mortensen, Kell ; Engblom, Johan
Research Centre Biofilms - Research Center for Biointerfaces
Date 2017
English abstract
The binary system perfluorohexyloctane (F6H8)–tetradecane (C14) was investigated in order to increase understanding of interactions of semifluorinated alkanes (SFAs) with hydrophobic molecules. The thermal phase behavior for F6H8 and C14 and their mixtures was determined using DSC. The activity coefficients for both components in the mixtures were calculated and Gibbs energy of mixing was determined. Furthermore, enthalpies of mixing were determined with ITC and structural investigations of the solid and the liquid phases were performed with SAXS and SWAXD. It was found that F6H8 displays one solid-solid transition at −42.3 °C (ΔH = 1.1 kJ/mol) and one solid-liquid transition at −5.9 °C (ΔH = 16.6 kJ/mol). Due to the low enthalpy of the solid-liquid transition it is likely that F6H8 is not fully crystallized in the solid phase but partly amorphous. The F6H8–C14 system displays a eutectic phase behavior and the liquid mixtures display a positive deviation from ideal mixing. C14 crystalizes in a triclinic unit cell as shown before, whereas crystallization of F6H8 in a lamellar rippled phase is shown for the first time. This ripple phase comprises a bilayer of tilted alternating heavily interdigitated F6H8 molecules in an oblique subunit cell.
DOI https://doi.org/10.1016/j.jct.2016.10.032 (link to publisher's fulltext.)
Publisher Elsevier
Host/Issue The Journal of Chemical Thermodynamics;
Volume 105
ISSN 0021-9614
Pages 352–361
Language eng (iso)
Subject SFA
perfluorohexyloctane
Phase diagram
tetradecane
F6H8
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/24222 Permalink to this page
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