Patterning of Soft Oxometalates, their Formation and Applications

Thomas, Preethi (2017) Patterning of Soft Oxometalates, their Formation and Applications. PhD thesis, Indian Institute of Science Education and Research Kolkata.

PDF (PhD thesis of Preethi Thomas (11IP01)) 11IP01_PhD.pdf - Submitted Version Restricted to Repository staff only Download (6MB)

Abstract

In this work, we discuss the patterning method of soft oxometalates which involves controlled nucleation of soft colloidal forms of oxometalates to form polycrystalline POM trails. We have employed these microfabricated galleries for catalytic applications monitored via time-resolved Raman spectroscopy. The SOM and SOM hybrid trails have demonstrated efficient site-specific catalysis of epoxidation of alkenes and oxidation of aldehydes, respectively. Furthermore, we have explored the sensing capabilities of these trails in detecting biologically important molecules such as glucose, uric acid, and ascorbic acid which serve as molecular biomarkers in disease detection. Additionally, using dynamic light scattering and scanning electron microscopy, we have studied the colloidal regimes and the unique morphologies formed by phosphomolybdic acid at high temperatures via aggregation. Finally, we have explored the different phases of heptamolybdate in water by varying concentration and temperature and developed a phase diagram. The different phases were studied using Mueller matrix polarimetry. The osmotic compressibility values which indicate the cut-off concentration suitable for phase transition was also determined by light scattering experiments.

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