|Present Work and Research|
interests are in chemical systems that generate chaotic dynamics. Studies done
in various nonlinear systems maintained far from equilibrium have demonstrated
a universal sequence of instabilities that are system-independent. The
Belousov-Zhabotinskii (BZ) oscillator has been the most well-studied nonlinear
chemical system. So far our studies on reactions of oxyhalogens with small
organosulfur compounds have generated nonlinear behavior that rivals the BZ. I
am not only interested in temporal chaos, but also in spatiotemporal chaos in
which structure and form can be derived from erstwhile homogenous environments.
When maintained far from equilibrium, these systems generate chemical
oscillations, symmetry-breaking bifurcations, and traveling waves. Several
studies have also been done on systems that suppress convection. In my project
we introduce a possible new mechanism for pattern-formation that involves both
convection and advection. Most realistic problems that need to be studied as in
ocean layering dynamics, weather patterns and crystal growth do involve
convection as the major driving force for self-organization. This
self-organization behavior involves the characterization of the
symmetry-breaking bifurcations based on the chemistry of the driving reaction.
Other parameters that we use to understand these remarkable systems include
viscosity of the medium, ambient temperature, vessel geometry, and gravity.
Most of the studies, however, will involve the study of the coupling between
thermogravitational and thermocapillary effects.
My work is mostly focused on the oxyhalogen
oxidation of thiourea and its derivatives
and trying to explain the patterns that are
formed from the self-organization of the
traveling chemical waves generated in these
My work is mostly focused on the oxyhalogen oxidation of thiourea and its derivatives and trying to explain the patterns that are formed from the self-organization of the traveling chemical waves generated in these reactions.
I have also been involved in kinetics of selected organosulfur compounds in the presence of physiological oxidants such as oxyhalogens and peroxide. The beauty of working with oxyhalogens as oxidants is that their chemistry has been thoroughly studied and and they also produce HOCl, HOBr and HOI as their most reactive species. These reactive oxygen species are also produced in the human body from the myeloperoxidase and eosinophil-catalyzed peroxidation of halide ions and as such we hope to be able to extrapolate our findings to the physiological system. I have worked on the oxidation of thiocarbamides that have been implicated in goitrogenic activities and have also worked with thiols, such as cysteamine, that have been implicated in DNA repair mechanisms and as antioxidants. I am also involved in comparative studies on the effects of substitution on the reactivities of thiourea and its methyl substituted derivatives. Substituted thioureas are known to have varying toxicities in the physiological environment and some of them are known carcinogens, goitrogens and teratogens.