Benoit Lessard, University of Ottawa
Host: Prof. Tim Bender
Our society is faced with an increasing challenge of E-waste, and with the proliferation of the internet of things and smart packaging, this is only going to get worse. Low cost printed electronics are facilitating the development of emerging technologies, from artificial skin to stretchable and bendable cell phone displays. The desire to integrate these materials onto biodegradable substrates or to use compostable active materials is necessary. Furthermore, the chemical toolbox available to us enables the fine-tuning of the materials to design and engineer the desired properties. This seminar will cover our groups recent advances in the simple fabrication of semiconductive single walled carbon nanotube transistors on high performing green dielectrics, advances towards the development of biodegradable and flexible transparent heaters, and the use of phthalocyanines as low cost semiconductors for the development of point-of-source sensors such as cannabinoid detection and speciation. We aim to build structure property relationships between material design, thin film processing, and device performance for the enabling of sustainable next-generation electronics.
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Professor Benoit Lessard joined the Department of Chemical & Biological Engineering at the University of Ottawa in 2015 as an Assistant Professor, was promoted to Associate Professor in May 2019, and Cross Appointed to the School of Electrical Engineering and Computer Science in 2020. He was awarded the Tier 2 Canada Research Chair in Advanced Polymer Materials and Organic Electronics (renewed in 2020), 2018 Ontario Early Researcher Award, the 2015 Charles Polanyi Prize in Chemistry, The University of Ottawa Early Career Researcher of the Year Awards for 2021, the 2021 Chemical Engineering Innovation award (under 40), 2022 The Canadian Journal of Chemical Engineering Lectureship award and NOVA Chemicals MSED Early Career Investigator Award. Prof. Lessard was also named a 2018 J. Mater. Chem. C Emerging Researcher (RSC), Flexible and Printed Electronics Emerging Leaders of 2023 (IOPscience) and 2023 “Small” Nano Micro Rising Star (Wiley Journals).
Since 2008, Prof. Lessard has published 147 peer reviewed journal articles, 16 patent applications, and presented his work over 150 times at international and national conferences. Lessard is co-founder of Ekidna Sensing inc, a spinoff company based on cannabinoid sensors. Prior to joining uOttawa, Prof. Lessard completed an NSERC Banting Fellowship at the University of Toronto studying crystal engineering and OPV/OLED fabrication and obtained his PhD (2012) from McGill University in Polymer reaction engineering.
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Questions? Please contact Michael Martino, External Relations Liaison (michael.martino@utoronto.ca)
Claudia Schmidt-Dannert, University of Minnesota
Host: Prof. Emma Master
In biological systems, simple building blocks such as proteins, nucleic acids and lipids are precisely organized to form higher ordered structures across multiple length scales. Harnessing the principles and mechanisms underlying the self-assembly and self-organization of natural structures and materials offers tremendous opportunities for the design and scalable fabrication of functional biomaterials with emergent properties. Proteins and peptides provide the greatest versatility for the bottom-up design and low-cost production of such self-assembling supramolecular materials due to the chemical diversity of their amino acid building blocks. They are also genetically encoded, allowing for the genetically programmable production of self-organizing materials using cell factories or synthesize self-assembling materials de novo via cell free expression systems. Proteins are also key players in the formation of inorganic-organic composite materials with properties unmatched by synthetic properties. Inspired by the spatial organization of enzymes at the subcellular level via protein nanostructures, we are taking advantage of these mechanisms for the design of self-assembling protein-based nano-architectures for different applications, including for in vitro biocatalysis and the fabrication of new types of functional materials. Of key interest to us is the discovery and design of mechanisms with which to interface protein-based materials with biomineralization processes to produce innovative materials with unique mechanical and other properties. I will discuss possibilities and examples from our work for the design of genetically encoded self-assembling 2D and 3D-protein scaffolds as functional materials for diverse applications, including for biocatalysis and biosynthesis and as living materials.
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Dr. Claudia Schmidt-Dannert is a Distinguished McKnight Professor and Kirkwood Chair of Biochemistry in the Dept. of Biochemistry and the Director of the Biotechnology Institute at the University of Minnesota.
She completed her B.S. and M.S. in Biochemistry and Genetics at the TU Braunschweig and performed her PhD research at the National Research Center for Biotechnology in Braunschweig (GBF, now Helmholtz Center for Infectious Diseases). She then moved to the University of Stuttgart and became group leader of the Molecular Biotechnology Group in the Institute of Technical Biochemistry (Rolf Schmid group). In 1998, she received a Habilitation Fellowship from the German Science Foundation for “molecular breeding of pathways” and with this project, joined Prof. Arnold’s group at Caltech. In 2000, she joined the faculty at the University of Minnesota.
Current research efforts in her group focus on using synthetic biology approaches for the design of genetically programmable materials for biosynthesis, biocatalysis and other applications, including the fabrication of living materials. Another area of expertise in her group is in the engineering of different microbial chassis organisms to produce valuable chemicals. Dr. Schmidt-Dannert has published numerous manuscripts, patents, and book chapters; serves as Editor and board member of several journals and received several awards such as a David and Lucile Packard Fellowship and McKnight Fellow- and Professorships.
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Questions? Please contact Michael Martino, External Relations Liaison (michael.martino@utoronto.ca)
Petros Koutrakis, Harvard University
Host: Prof. Jeffrey Brook
The recent Global Burden of Disease (GBD) study estimated that long-term exposure to fine particulates (PM2.5) caused 9 million deaths worldwide in 2019, making it the fourth-ranked global risk factor for that year. The PM properties responsible for its toxicity are still not fully understood. Recently, we found that radon (Rn) exposure is associated with mortality in the Northeastern U.S., and we have reported associations between PM gross β-activity and blood pressure, oxidative stress, and lung and cardiac function. A large fraction of the total exposure to naturally occurring ionizing radiation is through inhalation of ambient particles carrying attached radionuclides. The primary source of this PM radioactivity (PR) is Radon (Rn) gas through its decay products. Rn emanates from the soil and enters the atmosphere, including indoor air, where it decays. The resulting radionuclides attach to inhalable PM, which deposit in the lungs and continue to release ionizing radiation (α-, β- and γ-radiation) causing pulmonary inflammation and oxidative stress. To date, most previous environmental radiation studies have focused on the cancer effects of Rn progeny, therefore, there are significant knowledge gaps regarding the non-cancer effects of radon and PR. Our recent research has demonstrated that these non-cancer effects are, in fact, very important. Specifically, we have generated new information showing that exposures to Rn as well as PM gross α-, β- and γ-activities are associated with numerous adverse health outcomes, including blood pressure, oxidative stress, cardiac, lung and liver function, gestational diabetes and hypertension, and total and cardiopulmonary mortality.
These observations provide strong scientific evidence for our hypothesis that inhaled Rn progeny and other radionuclides, measured as PR, can have direct health effects through stimulation of inflammatory and oxidative processes. Therefore, assessing exposures and effects of PR may be of paramount importance to understanding of particle toxicity. During my presentations I will summarize many PR studies regarding measurement methods, sources, relationships between indoor and outdoor levels and, toxicity assays. Also, I will present results from cohort studies examining a large spectrum of health outcomes and population mortality studies. Finally, I will discuss research needs to advance this emerging research area.
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Petros Koutrakis has over 35 years of experience in environmental health sciences. His interests include human exposure assessment, ambient and indoor air pollution, environmental analytical chemistry, remote sensing, and environmental radioactivity. His research career has focused on studying exposure methods, developing sampling techniques for gaseous and particulate air pollutants, and studying the effects of air pollution on human health. His research group has conducted a large number of ambient and indoor air quality studies in the U.S. and abroad. These studies made it possible to identify and quantify the sources contributing to ambient, micro-environmental and indoor exposures. Finally, these investigations significantly advanced scientific knowledge of associations between exposures and health outcomes and made important contributions to assessments of the impacts of air pollution on human health in different populations.
View the complete 2023-24 LLE schedule
Questions? Please contact Michael Martino, External Relations Liaison (michael.martino@utoronto.ca)