Origin of Invariant Gel Melting Temperatures in the c–T Phase Diagram of an Organogel

Binary c–T phase diagrams of organogelators in solvent are frequently simplified to two domains, gel and sol, even when the melting temperatures display two distinct regimes, an increase with T and a plateau. Herein, the c–T phase diagram of an organogelator in solvent is elucidated by rheology, DSC...

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Bibliographic Details
Published in:Langmuir 2016-05, Vol.32 (19), p.4975-4982
Main Authors: Christ, Elliot, Blanc, Christophe, Al Ouahabi, Abdelaziz, Maurin, David, Le Parc, Rozenn, Bantignies, Jean-Louis, Guenet, Jean-Michel, Collin, Dominique, Mésini, Philippe J.
Format: Article
Language:English
Subjects:
Condensed Matter
Interface-Rich Materials and Assemblies
Materials Science
Physics
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Summary:Binary c–T phase diagrams of organogelators in solvent are frequently simplified to two domains, gel and sol, even when the melting temperatures display two distinct regimes, an increase with T and a plateau. Herein, the c–T phase diagram of an organogelator in solvent is elucidated by rheology, DSC, optical microscopy, and transmitted light intensity measurements. We evidence a miscibility gap between the organogelator and the solvent above a threshold concentration, c L. In this domain the melting or the formation of the gel becomes a monotectic transformation, which explains why the corresponding temperatures are nonvariant above c L. As shown by further studies by variable temperature FTIR and NMR, different types of H-bonds drive both the liquid–liquid phase separation and the gelation.
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.6b00995