2011
DOI: 10.1021/jp200281f
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Solvent Dynamical Behavior in an Organogel Phase As Studied by NMR Relaxation and Diffusion Experiments

Abstract: An organogelation process depends on the gelator-solvent pair. This study deals with the solvent dynamics once the gelation process is completed. The first approach used is relaxometry, i.e., the measurement of toluene proton longitudinal relaxation time T(1) as a function of the proton NMR resonance frequency (here in the 5 kHz to 400 MHz range). Pure toluene exhibits an unexpected T(1) variation, which has been identified as paramagnetic relaxation resulting from an interaction of toluene with dissolved oxyg… Show more

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Cited by 30 publications
(43 citation statements)
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References 25 publications
(45 reference statements)
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“…This appears to be reasonable for such organogels (12). 2 and 4), the plateau value for ''in'' toluene being assumed to be the one of pure toluene multiplied by (1 À p).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…This appears to be reasonable for such organogels (12). 2 and 4), the plateau value for ''in'' toluene being assumed to be the one of pure toluene multiplied by (1 À p).…”
Section: Resultsmentioning
confidence: 99%
“…In a previous study (12), we reached the conclusion that toluene could be inside the gel structure (this will be denoted ''in'' toluene) or in the isotropic phase, that is the liquid phase which coexists with the gel structure (this will be denoted ''out'' toluene). p will denote the proportion of ''in'' toluene.…”
Section: Pure Toluenementioning
confidence: 99%
“…6). Even though there are studies showing that the interactions between the solvent and the gelator are practically non-existent when the solvent is included in the xerogel solid structure [90], the chlorobenzene molecules may affect on or direct the packing of 1 in the process of formation of the microstructure [91]. As can be seen, the composition or structure of a xerogel or a crystalline sample is not straightforward and oversimplifications should be avoided.…”
Section: Discussionmentioning
confidence: 99%
“…[134][135][136] Supramolecular gels may also exhibit swelling phenomena. 134 However, gel-solvent interactions are commonly (with some exceptions 137 ) important for the stability of the fibrous network, 76 so removal of even a fraction of the solvent may lead to destruction of gel-like properties. For example, Kiyonaka et al found that heating a hydrogel of 7a to 65 o C produces reversible shrinkage with visible expulsion of water, but heating to 69 o C results in the complete loss of solvent to give a white precipitate (Fig.…”
Section: Swelling Effectsmentioning
confidence: 99%