(posted on Sunday, October 21, 2018)
Friday, November 9 - Akron Section Award and General Meeting
Prof. William Dichtel
The Robert L. Letsinger Professor of Chemistry, Northwestern University
The University of Akron, Mary Gladwin Hall, Room 111
Akron OH 44325
2:00 PM Improved Synthesis of Two-Dimensional Covalent Organic Frameworks
Evening Lecture and Award Presentation
Hiram College in the Kennedy Center (Dix Dining Hall)
Hiram OH 44324
5:30 PM Reception
6:30 PM Dinner
7:30 PM Removing Organic Pollutants from Water Using Polymers Derived from Corn
RSVP to Charles M. Kausch, firstname.lastname@example.org by Mon., Nov. 5 at noon. Both lectures are free and open to the public.
Afternoon Abstract: Improved Synthesis of Two-Dimensional Covalent Organic Frameworks
Polymerizing monomers into periodic two-dimensional (2D) networks provides structurally precise, layered macromolecular sheets that exhibit desirable mechanical, opto-electrotronic, and molecular transport properties. 2D covalent organic frameworks (COFs) offer broad monomer scope but are generally isolated as powders comprised of aggregated nanometer-scale crystallites. Dichtel will discuss 2D COF formation using a two-step procedure, in which monomers are added slowly to pre-formed nanoparticle seeds. The resulting 2D COFs are isolated as single-crystalline, micron-sized particles. Transient absorption spectroscopy of the dispersed COF nanoparticles provides two to three orders of magnitude improvement in signal quality relative to polycrystalline powder samples and suggests exciton diffusion over longer length scales than those obtained through previous approaches. These findings will enable a broad exploration of synthetic 2D polymer structures and properties.
Evening Abstract: Removing Organic Pollutants from Water Using Polymers Derived from Corn
Organic micro-pollutants, such as pesticides and pharmaceuticals, have raised concerns about negative effects on ecosystems and human health. These compounds are introduced into water resources by human activities, and current wastewater treatment processes do not remove them. Activated carbons are the most widespread adsorbents used to remove organic pollutants from water, but they have several deficiencies, including poor removal of relatively hydrophilic micro-pollutants, inferior performance in the presence of naturally occurring organic matter, and energy-intensive regeneration processes. Dichtel will describe polymers based on ß-cyclodextrin, an inexpensive, sustainably produced derivative of glucose, that binds these emerging contaminants from water. His research group has also recently modified our original polymer design to target perfluorinated compounds such as PFOA, which are environmentally persistent associated with negative effects at trace concentrations.
Bio - Dr. William Dichtel is known for his pioneering research in covalent organic frameworks (COFs). Unlike traditional organic polymers, COFs exhibit long-range order and permanent porosity that can be designed using the tools of organic chemistry. Dichtel has advanced COF synthesis dramatically by making more advanced structures with interesting properties and by developing a basic understanding of how to make high-quality samples. These discoveries will enable future real-world advancements in water purification, energy and gas storage, detection of explosives, and other applications.
Dichtel received a bachelor’s degree from the Massachusetts Institute of Technology (MIT) and a doctorate degree at the University of California, Berkeley. He has won numerous awards, most recently the 2018 Cottrell Frontiers in Research Excellence and Discovery (FRED) Award and the 2017 Leo Hendrik Baekeland Award. He also received a MacArthur Fellowship in 2015, the National Fresenius Award from the Phi Lambda Upsilon National Chemistry Honor Society, the Polymer International – IUPAC Award for Creativity in Applied Polymer Science, the Camille Dreyfus Teacher-Scholar Award, the Arthur C. Cope Scholar Award from the American Chemical Society Award and a Beckman Young Investigator Award from the Arnold and Mabel Beckman Foundation.