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Structural relationships in 2,3-bis-n-decyloxyanthracene and 12-hydroxystearic acid molecular gels and aerogels processed in supercritical CO(2).

hal.structure.identifierStructures et propriétés d'architectures moléculaire [SPRAM - UMR 5819]
dc.contributor.authorTERECH, Pierre
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorAYMONIER, Cyril
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLOPPINET-SERANI, Anne
hal.structure.identifierDepartment of Organic Chemistry
dc.contributor.authorBHAT, Shreedhar
hal.structure.identifierDepartment of Organic Chemistry
dc.contributor.authorBANERJEE, Supratim
hal.structure.identifierDepartment of Organic Chemistry
dc.contributor.authorDAS, Rajat
hal.structure.identifierDepartment of Organic Chemistry
dc.contributor.authorMAITRA, Uday
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorDEL GUERZO, André
hal.structure.identifierInstitut des Sciences Moléculaires [ISM]
dc.contributor.authorDESVERGNE, Jean-Pierre
dc.date.issued2010
dc.identifier.issn1520-6106
dc.description.abstractEnSupercritical carbon dioxide is used to prepare aerogels of two reference molecular organogelators, 2,3-bis-n-decyloxyanthracene (DDOA) (luminescent molecule) and 12-hydroxystearic acid (HSA). Electron microscopy reveals the fibrillar morphology of the aggregates generated by the protocol. SAXS and SANS measurements show that DDOA aerogels are crystalline materials exhibiting three morphs: (1) arrangements of the crystalline solid (2D p6m), (2) a second hexagonal morph slightly more compact, and (3) a packing specific of the fibers in the gel. Aggregates specific of the aerogel (volume fraction being typically phi approximately 0.60) are developed over larger distances (approximately 1000 A) and bear fewer defaults and residual strains than aggregates in the crystalline and gel phases. Porod, Scherrer and Debye-Bueche analyses of the scattering data have been performed. The first five diffraction peaks show small variations in position and intensity assigned to the variation of the number of fibers and their degree of vicinity within hexagonal bundles of the related SAFIN according to the Oster model. Conclusions are supported by the guidelines offered by the analysis of the situation in HSA aerogels for which the diffraction pattern can be described by two coexisting lamellar-like arrangements. The porosity of the aerogel, as measured by its specific surface extracted from the scattering invariant analysis, is only 1.8 times less than that of the swollen gel and is characteristic of a very porous material.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enStructural relationships in 2,3-bis-n-decyloxyanthracene and 12-hydroxystearic acid molecular gels and aerogels processed in supercritical CO(2).
dc.typeArticle de revue
dc.identifier.doi10.1021/jp104818x
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Physical Chemistry B
bordeaux.page11409-11419
bordeaux.volume114
bordeaux.issue35
bordeaux.peerReviewedoui
hal.identifierhal-00529846
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00529846v1
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