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- Origin of Invariant Gel Melting Temperatures in the c-T Phase Diagram of an Organogel doi link

Auteur(s): Christ Elliot, Blanc C., Al Ouahabi Abdelaziz, Maurin D., Le Parc R., Bantignies J.-L., Guenet Jean-Michel, Collin Dominique, Mesini Philippe J.

(Article) Publié: Langmuir, vol. 32 p.4975-4982 (2016)
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Ref HAL: hal-01344912_v1
DOI: 10.1021/acs.langmuir.6b00995
WoS: WOS:000376223800033
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Résumé:

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, cL. In this domain the melting or the formation of the gel becomes a monotectic transformation, which explains why the corresponding temperatures are nonvariant above cL. 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.