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DTSTART;TZID=America/Los_Angeles:20201112T120000
DTEND;TZID=America/Los_Angeles:20201112T120000
DTSTAMP:20260618T214753
CREATED:20201110T190016Z
LAST-MODIFIED:20201110T190016Z
UID:13391-1605182400-1605182400@www.chemistry.ucla.edu
SUMMARY:Chem 218: Prof. Vanessa Wood
DESCRIPTION:“Structure and Surfaces at the Nanoscale” \n Abstract: Liquid-phase and wet-processing techniques offer tremendous opportunities for low-cost manufacturing and enable the concept of large-scale nanotechnology. Today\, these approaches have facilitated the massive upscaling of lithium ion battery technology and promise to play a future role in a wide variety of electronic\, photonic\, and electrochemical systems. Materials and devices made from these approaches often exhibit hierarchical structures and have complex interfaces that are key to their performance. In this talk\, I will describe the importance of understanding structure-performance relationships to achieve the full potential of solution processed systems.  \nTo characterize structure and structural dynamics in these complex\, multiscale materials\, we leverage a wide variety of techniques including electron microscopies\, x-ray imaging\, diffraction\, and scattering\, neutron scattering and imaging\, and muon spectroscopy. Combining information from characterization with simulation and experiment\, we use our findings to understand the origins of performance limitations and develop design guidelines to systematically improve material and devices.  \nMy talk will present several examples\, including the role of nanocrystal surfaces in determining their emission linewidths\, carrier cooling\, and charge transport\, and the role of nanoscale structure and surface chemistry on electrolyte infilling in lithium ion batteries and lithium transport. I will address the experimental and computational challenges associated with studying these systems and emphasize ways machine learning techniques and systematic leveraging of size control the nanoscale can be used to overcome these challenges.
URL:https://www.chemistry.ucla.edu/seminars/chem-218-prof-vanessa-wood/
CATEGORIES:Other,Seminars
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DTSTART;TZID=America/Los_Angeles:20201112T160000
DTEND;TZID=America/Los_Angeles:20201112T160000
DTSTAMP:20260618T214753
CREATED:20200923T220311Z
LAST-MODIFIED:20200923T220311Z
UID:13376-1605196800-1605196800@www.chemistry.ucla.edu
SUMMARY:Development of New Chemical Platforms for Polymer Synthesis
DESCRIPTION:Abstract: Synthetic polymers have permeated nearly every facet of modern life. From the ubiquity of polyolefins to recent advancements in 3-D printing\, organic materials continue to shape the world around us. While tremendous accomplishments have been made with relatively few polymer families\, the future requires the development of materials with increased control over structure to produce systems that can respond to programmed inputs\, as well as the exploration of entirely new polymer compositions. Our group takes a chemistry-focused approach to address these challenges through the strategic application of organic methodologies to design new monomer families and reagents for precision polymer synthesis. This presentation will specifically highlight (1) the utility of enyne chemistry to impart degradability and expedite functionalization of metathesis-derived materials and (2) the development of a new class of living polymerization that is enabled by the unusual reactivity profiles of twisted amide molecules.
URL:https://www.chemistry.ucla.edu/seminars/development-new-chemical-platforms-polymer-synthesis/
CATEGORIES:Organic Colloquium,Seminars
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