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Hybrid organogels and aerogels from co-assembly of structurally different low molecular weight gelators

Banerjee, Supratim and Das, Rajat K and Terech, Pierre and de Geyer, Arnaud and Aymonier, Cyril and Loppinet-Serani, Anne and Raffy, Guillaume and Maitra, Uday and Del Guerzo, Andre and Desvergne, Jean-Pierre (2013) Hybrid organogels and aerogels from co-assembly of structurally different low molecular weight gelators. In: Journal of Materials Chemistry C, 1 (20). pp. 3305-3316.

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Official URL: http://dx.doi.org/10.1039/C3TC30104D

Abstract

The blending of perfluorinated bile ester derivatives with the gelator 2,3-didecyloxyanthracene (DDOA) yields a new class of hybrid organo- and aerogels displaying a combination of optical and mechanical properties that differ from those of pure gels. Indeed, the nanofibers constituting the hybrid organogels emit polarized blue light and display dichroic near-UV absorption via the achiral DDOA molecules, thanks to their association with a chiral bile ester. Moreover, the thermal stability and the mechanical yield stress of the mixed organogels in DMSO are enhanced for blends of DDOA with the deoxycholic gelator (DC11) having a C-11 chain, as compared to the pure components' gels. When the chain length of the ester is increased to C-13 (DC13) a novel compound for aerogel formation directly in scCO(2) is obtained under the studied conditions. A mixture of this compound with DDOA is also able to gelate scCO(2) leading to novel composite aerogel materials. As revealed by SAXS measurements, the hybrid and the pure DDOA and DC13 aerogels display cell parameters that are very similar. These SAXS experiments suggest that crystallographic conditions are very favorable for the growth of hybrid molecular arrangements in which DDOA and DC13 units could be interchanged. Specific molecular interactions between two components are not always a pre-requisite condition for the formation of a hybrid nanostructured material in which the components mutually induce properties.

Item Type: Journal Article
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Additional Information: Copyright of this article belongs to Royal Society of Chemistry.
Department/Centre: Division of Chemical Sciences > Organic Chemistry
Date Deposited: 12 Jun 2013 11:27
Last Modified: 12 Jun 2013 11:27
URI: http://eprints.iisc.ernet.in/id/eprint/46707

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