Laishram, Raju and Maitra, Uday (2019) Supramolecular Gelation of Europium and Calcium Cholates through the Nucleation-Elongation Growth Mechanism. In: CHEMPLUSCHEM, 84 (7). pp. 853-861.
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Abstract
A detailed understanding of gelation mechanism can enable the properties of gels to be tuned for various applications, and may possibly help in understanding the aggregation of different biomolecules. We report a detailed study of the morphological and physio-chemical changes, dynamics (of a probe), and kinetics during the gelation of europium and calcium cholate hydrogels, leading to the development of a growth model. AFM images showed the transition of aggregated particles (100-150 nm) in the sol phase growing to a fibrous network in the gel through the entanglement of fibres, and not by dendritic growth (height analysis). The dynamic changes during this phase transformation were studied using a fluorescence probe (change in intensity and lifetime). We have been able to delineate the growth mechanism by using a combination of Eu(III) luminescence and a polarity sensitive fluorescence probe. The growth was found to follow the nucleation-elongation model, and these two phases responded in distinctly different fashions in rheological and luminescence measurements.
| Item Type: | Journal Article |
|---|---|
| Publication: | CHEMPLUSCHEM |
| Publisher: | WILEY-V C H VERLAG GMBH |
| Additional Information: | Copyright for this article belongs to WILEY-V C H VERLAG GMBH |
| Keywords: | gels; growth mechanisms; luminescence; nucleation-elongation; supramolecular chemistry |
| Department/Centre: | Division of Chemical Sciences > Organic Chemistry |
| Date Deposited: | 09 Jan 2020 10:50 |
| Last Modified: | 09 Jan 2020 10:50 |
| URI: | http://eprints.iisc.ac.in/id/eprint/63466 |
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