Dr. James F. Gilchrist of Lehigh University will be speaking the to the Department of Chemical Engineering and Materials Science on October 20 on "Fundamental Aspects of Convective Assembly for Nanostructured Materials."
Convective deposition of nano- and microscale particles is used as a platform for scalable nanomanufacturing of surface morphologies to control and enhance photon, electron, and mass transport. The fundamental mechanism behind self-organization of these particles is attraction driven by the local capillary interactions and flow steering of particles confined in a thin film of an advancing meniscus. By studying and altering thin film dynamics, we can control morphology and various instabilities that occur during deposition of mono- and bidisperse suspensions. For instance, by adjusting the suspension profile we alter assembly from a particle-by-particle deposition to a pre-organized deposition mode that affects the deposited morphology. Likewise, lateral mechanical oscillatory motion of the substrate alters the mode of deposition increasing the rate of deposition and reducing the sensitivity of the process to fabricate crystalline monolayers and the unique ability to form flow-templated long range thin film FCC 100 colloidal crystals. This process has been successful in fabricating coatings that enable or enhance performance of light emitting diodes (LEDs and OLEDs), dye sensitized solar cells (DSSCs), polymeric and inorganic membranes, and cell capture platforms. Each application, including our goal toward making this an industrially-relevant scalable nanomanufacturing process and continuing our interest in studying the fundamental properties of suspension microstructure and mechanics, will be discussed briefly. Support for this work has come from the National Science Foundation CBET and the Scalable Nanomanufacturing Program, the Department of Energy, and the PA NanoMaterials Commercialization Center.
Dr. James Gilchrist is a Professor of Chemical and Biomolecular Engineering at Lehigh University. He received his B.S. in Chemical Engineering from Washington University in St. Louis and Ph.D. from Northwestern University. Prior to joining the faculty of Lehigh University in 2004, he was a postdoctoral research associate in the Department of Materials Science and Engineering at University of Illinois working with Professor Jennifer A. Lewis. Gilchrist directs the Laboratory for Particle Mixing and Self-Organization with research interests spanning various particle technologies including nanoparticle self-assembly, suspension rheology and transport, hemodynamics, microfluidics, chaotic mixing, and granular dynamics. He held Lehigh’s P.C. Rossin Assistant Professorship from 2007-2010 and the Class of 1961 Associate Professorship from 2013-2015, received the North American Mixing Forum Young Faculty Award in 2007, was a visiting professor in the Department of Chemical Engineering at the California Institute of Technology for the 2011-2012 academic year, and a Visiting Professorial Fellow at University of New South Wales in 2016.