|dc.description.abstract||This thesis presents a detailed study on the unusual properties of silver cholate,
applications of lanthanide cholate gels, enhanced luminescence of lanthanides by water, and
the mechanism of formation of these gels. Chapter 2 discusses unusual properties of silver cholate hydrogel. This gel has
hydrophobic pockets which hydrophobicity is similar to that of degassed cyclohexane, which
has not been seen in any other supramolecular system. Additionally, unlike other known
metal cholate hydrogels, silver cholate hydrogel showed a thermo and mechano responsive
Chapter 3 has addressed the mechanism of metal cholate hydrogelation using a
variety of techniques. The morphology of the aggregates changed substantially during the sol
(spherical particles) to gel transition (fibres), by entanglement and not by dendritic growth.
The growth was found to go through a nucleation–elongation model with instantaneous
nucleation and 1D interface controlled growth.
A simple protocol rapidly detect naproxen and propranolol using TbCh gel has been
discussed in Chapter 4. The system was easy to prepare and use, showed very low LOD, could
be used to detect the drugs from unprocessed blood, and could differentiate these drugs from
their closely related analogues.
Chapter 5 presents an unexpected role of water in enhancing the luminescence of
Eu(III) in EuCh gel. We showed that this was due to the sensitization of the lanthanide
emission by hydrophobic partitioning of pyrene on the hydrogel fibres which brought it in
close proximity to the lanthanide ion.
Finally, chapter 6 deals with the design of two white light emitting lanthanide–based
systems prepared from commercially available materials. While most of the other reported
white light emitting materials require complex synthesis or harsh procedures, our systems
were prepared by simply mixing aqueous solutions of the components and sonicating for 1–
3 minutes, without any other processing.||en_US
|dc.rights||I grant Indian Institute of Science the right to archive and to make available my thesis or dissertation in whole or in part in all forms of media, now hereafter known. I retain all proprietary rights, such as patent rights. I also retain the right to use in future works (such as articles or books) all or part
of this thesis or dissertation||en_US
|dc.subject||white light producing materials||en_US
|dc.subject.classification||Research Subject Categories::NATURAL SCIENCES::Chemistry::Organic chemistry::Polymer chemistry||en_US
|dc.title||Properties and Applications of Metal Cholate Hydrogels||en_US
|dc.degree.grantor||Indian Institute of Science||en_US
|dc.degree.discipline||Faculty of Science||en_US