Etude physico-chimique d'organogels et d'aérogels de faible poids moléculaire dérivés d'acides aminés

TL;DRAbstract

This work describes the synthesis and the gelation properties of new amino-acid-based low-molecular-weight derivatives in organic solvents as well as the development of the corresponding aerogels by supercritical CO2 drying. We have proved that in our case the presence of phenylalanine or leucine lateral chains were necessary for gelation. A solvent parameters study led us to define a favourable narrow Hansen parameter domain for gelation including aromatic and chlorinated solvents. The use of several spectroscopy methods (IR, NMR, circular dihroism and fluorescence) allowed to settle the interactions accountable for gelation phenomenon. Hydrogen bonds enable the unidimensional stacking-up of gelator molecules; next, the stacking-up are associated through intercolumnar stacking interactions. Monolithic aerogels were obtained. They display noteworthy properties among them an extremely low thermal conductivity under vacuum

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