3:45 pm
Kent and Zoom Room 107
"Recent advances in the study of colloidal nanocrystals enabled by in situ liquid cell transmission electron microscopy"
Colloidal nanocrystals have emerged as a major building block for nanoscience and nanotechnology. Today it is possible to control the size, shape, and topology of nanocrystals and to harness the variations of their properties to create materials with proven applications in biological imaging and electronic displays, and many more applications under development in renewable energy. Despite these advances, there is much we still do not know about the physical chemistry of nanocrystals. The advent of in situ liquid cell electron microscopy and the graphene liquid cell, have opened a new window into key aspects of the physical chemistry of nanocrystals. Small pockets of liquid, typically just a few tens of nanometer in thickness, and perhaps a few hundred in diameter, can be trapped between single or multiple layers of graphene. These layers are transparent to the electrons of a transmission electron microscope. Inside, we can observe previously hidden properties and events. This includes structural determination of the positions of all the atoms in a colloidal nanocrystal; methods for directly imaging and tracking individual nanocrystals as they move, grow, or dissolve; and the ability to measure the inter-particle potentials by observing pairwise relative motions. This talk will present recent work concerning the nature of the chemical environment and how to manipulate it in order to induce or inhibit chemical reactions. A second aspect will concern the use of machine learning and neural network approaches to analysis of the results of liquid cell TEM experiments. These new tools are enabling a second revolution in the science of nanocrystals, as they will permit to us to quantitatively control artificial colloidal nanoscale building blocks with atomic precision.
When: Dec 2, 2021 03:45 PM Central Time (US and Canada)
Topic: Special Seminar - Prof. Alivisatos
Title of Talk: Recent advances in the study of colloidal nanocrystals enabled by in situ liquid cell transmission electron microscopy
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https://uchicagogroup.zoom.us/webinar/register/WN_k13dTVuIQUq8MsNd1Hm5KQ
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