ChBE Seminar Series: A Designer's Toolkit for Contructing Complex Nanoparticle Libraries
Speaker: Raymond Schaak, Professor of Materials Chemistry, Pennsylvania State University
Multi-component nanoparticles offer unique opportunities to combine different properties in a single construct, enabling both multi-functionality and the emergence of new synergistic functions. Synthesizing such multi-component nanoparticles requires simultaneous control over size, shape, composition, and structure, as well as interfaces and spatial arrangements. We have been developing two complementary strategies for synthesizing multi-component nanoparticles. The first approach involves heterogeneous seeded growth, where interfaces and asymmetry are introduced by sequentially growing new nanoparticles off of the surfaces of existing nanoparticles. Complex hybrid nanoparticles of a growing number of materials, configurations, and morphologies can now be synthesized. The second approach involves sequential partial cation exchange reactions, where interfaces and asymmetry are introduced by compositional modifications that are made within an existing nanoparticle. A growing library of complex heterostructured metal sulfide nanoparticles can now be rationally designed and then readily synthesized.
Dr. Raymond Schaak is the DuPont Professor of Materials Chemistry in the Chemistry Department at Penn State University. Dr. Schaak also has a Courtesy appointment in the Chemical Engineering Department at Penn State and is part of the Penn State Materials Research Institute. Dr. Schaak received a B.S. degree in chemistry from Lebanon Valley College in 1998. In 2001, he received a Ph.D. in materials chemistry from Penn State University under the direction of Professor Thomas Mallouk, where he demonstrated the concept of solid-state retrosynthesis for the stepwise and predictable topotactic synthesis of bulk and nanostructured perovskite oxide materials. From 2001–2003, he was a postdoctoral research associate with Professor Robert Cava at Princeton University, where he worked on the synthesis and physical property characterization of metal carbide, boride, phosphide, oxide, and alloy superconductors. In 2003, Dr. Schaak began his independent career as an Assistant Professor in the Department of Chemistry at Texas A&M University. In 2007, he moved to Penn State University as an Associate Professor of Chemistry and was promoted to Professor in 2011. Dr. Schaak was appointed as the DuPont Professor of Materials Chemistry in 2013. His research group focuses on developing new chemical strategies for the synthesis of nanoscale solid-state materials and applying these materials to problems at the forefront of modern materials research. Dr. Schaak has received several prestigious awards, including an NSF Graduate Research Fellowship (1999), an NSF CAREER Award (2006), a Beckman Young Investigator Award (2006), a DuPont Young Professor Grant (2006), a Sloan Research Fellowship (2007), a Camille Dreyfus Teacher Scholar Award (2007), a Research Corporation Scialog Award for Solar Energy Conversion (2010), the National Fresenius Award (2011), the Penn State Faculty Scholar Medal in the Physical Sciences (2012), and the ACS Inorganic Nanoscience Award (2016). In 2017, Dr. Schaak was elected as a Fellow of the American Association for the Advancement of Science (AAAS). Dr. Schaak served as Awards Committee co-chair of the American Chemical Society’s Division of Inorganic Chemistry (ACS DIC) from 2007–2011 and as chair of the ACS DIC Nanoscience subdivision in 2013. Dr. Schaak serves on the Cottrell Scholar Selection Committee of the Research Corporation for Science Advancement, is a member of the Editorial Advisory Board of Journal of Solid State Chemistry, and is an Associate Editor of ACS Nano.