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Title: Solvent-Mediated fiber growth in organogels
Authors: Dasgupta, D
Srinivasan, S
Rochas, C
Ajayaghosh, A
Guenet, J-M
Keywords: Photoinduced charge-transfer
Thermoreversible gels
Oligo(p-phenylene vinylene)s
Issue Date: 2011
Publisher: Royal Society of Chemistry
Citation: Soft Matter 7(19):9311-9315;2011
Abstract: We have investigated the decisive role of the solvent type in the gelation of an oligo(p-phenylene vinylene) molecule with OH functions on the terminal groups (OPVOH). We show that gels of "hublike" morphology are obtained with benzyl alcohol, a solvent that mimics the chemical structure of the terminal groups, whereas a "randomly dispersed" morphology is obtained with trans-decahydronaphthalene and with benzyl methyl ether, a solvent very similar to benzyl alcohol except that the hydrogen of the OH function has been replaced by a CH3 group. Also, the thermodynamic behaviour, gel formation and gel melting are similar for benzyl methyl ether and trans-decahydronaphthalene but are significantly different in benzyl alcohol: the gel melting point is higher, and so is the melting enthalpy. Extrapolation of this parameter to 100% OPVOH gives a value significantly higher than that directly measured on pure OPVOH. Molecular organization as studied by X-ray diffraction and fluorescence properties follow the same trend. The occurrence of a molecular compound between OPVOH and benzyl alcohol is contemplated in an attempt to account for these outcomes.
ISSN: 1744-683X
Appears in Collections:2011

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