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SOLID STATE & STRUCTURAL CHEMISTRY UNIT
INDIAN INSTITUTE OF SCIENCE
BANGALORE 12
SPECIAL SEMINAR By Dr. Achintya Kundu
Max Born Institute for Nonlinear Optics & Short Pulse Spectroscopy
Max Born Str. 2A, 12489, Berlin Germany
Title
“From Surface to Bulk & Back: Towards a Unified Picture of Water Hydrogen Bonding Dynamics in Confined Systems”
on
Tuesday, 27th August, 2019 at 10.00 AM
Venue : SSCU Auditoriu
ALL ARE CORDIALLY INVITED TO ATTEND
CHAIRMAN, SSCU
ABSTRACT
The interface is a boundary between two bulk phases. Interfacial regions have the length scale of only a few nanometers, but they play a crucial role in chemistry and biology. Solute molecules adsorbed at liquid interfaces experience significantly different local environments from those in bulk liquid phases, which can make chemistry and biology at interfaces markedly different. When the molecules of interest are present both at the interface and in the bulk, the signal from the interface is overwhelmed by contributions of bulk molecules. Therefore, it is formidable task to study the interfacial molecules using the conventional linear optical techniques. The optical even order nonlinear spectroscopes have received significant attention to study the properties of the interfacial molecules. Recently, heterodyne detected vibrational sum frequency generation (HD-VSFG), an even-order nonlinear spectroscopy, was used as a noninvasive and label-free technique to characterize the structure and dynamics of molecules at the interfaces. In my talk, I will explain details of this technique and how to exploit them to solve some fundamental issues such as pH at interfaces, molecular orientation, and water hydrogen bonding network structure using this technique. In addition, I will explain the details of 3rd order nonlinear spectroscopy (two dimensional infrared spectroscopy, pump-probe spectroscopy) and applied these techniques to solve the fundamental issues such as water hydrogen bonding dynamics in confined systems (lipid multibilayer, micelle, polymers, crowded environment) and proton solvation in protic solvents.

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