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Article Dans Une Revue Langmuir Année : 2016

Two-component self-assemblies: investigation of a synergy between bis-urea stickers

Résumé

It is of interest to develop two-component systems for added flexibility in the design of supramolecular polymers, nanofibers or organogels. Bis-ureas are known to self-assemble by hydrogen bonding into long supramolecular objects. We show here that mixing aromatic bis-ureas with slightly different structures can yield surprisingly large synergistic effects. A strong increase in viscosity is observed when a bis-urea with the sterically demanding 2,4,6-trimethylbenzene spacer is combined with a bis-urea bearing no methyl group in position 2 of the aromatic spacer (i.e. 4-methylbenzene or 4,6-dimethylbenzene). This effect is the consequence of a change in supramolecular assembly triggered by the composition of the mixture. The mixture of complementary bis-ureas forms rod-like objects that are more stable by about 1 kJ/mol, and that are thicker than the rod-like objects formed by both parent systems.

Domaines

Chimie
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Dates et versions

hal-01383235 , version 1 (18-10-2016)

Identifiants

Citer

Emilie Ressouche, Sandrine Pensec, Benjamin Isare, Jacques Jestin, Laurent Bouteiller. Two-component self-assemblies: investigation of a synergy between bis-urea stickers. Langmuir, 2016, 32 (44), pp.11664-11671. ⟨10.1021/acs.langmuir.6b03325⟩. ⟨hal-01383235⟩
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