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X-WR-CALDESC:Events for UCLA
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DTSTART;TZID=America/Los_Angeles:20240221T140000
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DTSTAMP:20260614T195225
CREATED:20240205T232116Z
LAST-MODIFIED:20240205T232116Z
UID:32309-1708524000-1708527600@www.chemistry.ucla.edu
SUMMARY:Special Chemistry Seminar - Rigoberto Hernandez
DESCRIPTION:Hernandez Seminar Flyer \n\n\n\n   3D-Networked Nanoparticles for Autonomous Computing\n\n\n\n\n\n\nAbstract:  Over the last decade\, it has become clear that conventional VLSI is reaching key scaling limits. Moreover\, the energy efficiency of human-engineered electronic devices is many orders of magnitude lower as compared to biological computational structures. Such inefficiencies\, for example\, severely limit our ability to move from 2D to 3D architectures in materials systems as is needed to achieve high performance and span the complexity required for applications using big data or artificial intelligence. We therefore need a new class of materials that can enable computing\, but which are not bound by the rules of conventional VLSI\, and we are inspired by the fact that the brain is an existence proof for such low-energy high-computing materials that do not rely on a von Neumann architecture. We have pursued the use of polymer-networked nanoparticles as a possible alternative. We will summarize our progress on characterizing these materials and report the primitive structures that we have created computationally thus far.
URL:https://www.chemistry.ucla.edu/events/special-chemistry-seminar-rigoberto-hernandez/
LOCATION:Mani L. Bhaumik Centennial Collaboratory\, 607 Charles E. Young Dr.\, East\, Los Angeles\, CA\, 90095\, United States
CATEGORIES:Special Seminars
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DTSTART;TZID=America/Los_Angeles:20240221T160000
DTEND;TZID=America/Los_Angeles:20240221T170000
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UID:32060-1708531200-1708534800@www.chemistry.ucla.edu
SUMMARY:Jeffrey I. Zink Inorganic Chemistry Seminar Series Prof. Robert Comito
DESCRIPTION:Flyer: Prof. Robert Comito Flyer \nTitle: Bimetallic Main-Group Catalysts for the Synthesis of Advanced Biodegradable Polymers \nAbstract: Aliphatic polyesters are biodegradable and biocompatible materials that could replace polyolefins in many applications. However\, their synthesis with fine structural control remains challenging\, limiting the ability to tailor these materials for specialty and advanced applications. Our laboratory has developed a class of bimetallic main group catalysts for lactone and lactide polymerization distinguished by their electronic and steric tunability. The catalysts are constructed from binucleating bis(pyrazolyl)alkane ligands\, which we have prepared by a novel method. Targeting monomer selectivity\, stereocontrol\, and sequence control we have developed homobimetallic\, heterobimetallic\, and chiral analogues of these complexes. We show promising evidence for metal-metal cooperativity from significant enhancements in rate compared to monometallic analogues. Through systematic comparison of metal composition and ligand sterics\, we have identified a highly selective catalyst for lactone incorporation into polylactide\, providing copolymers with a highly alternating structure. We describe an unusual dilithium complex that polymerizes aldehydes with exceptional activity and selectivity\, raising opportunities for more sophisticated and adaptable oxygenated polymers.
URL:https://www.chemistry.ucla.edu/events/jeffrey-i-zink-inorganic-chemistry-seminar-series-prof-robert-comito/
LOCATION:Collaboratory Yoo Seminar & Conference Hall YH4222 
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