Mar 4, 2016
Brauer Hall, Room 12
Presenter: Yi Jiang
Yi Jiang is a graduate research assistant in the Department of Energy, Environmental and Chemical Engineering at Washington University in St. Louis. He joined the department after earning his BS in Environmental Engineering from Huazhong University of Science and Technology, and a MS in Environmental Sciences from Peking University, China. His overall research interests are nanomaterial synthesis via aerosol based approaches, colloidal behaviors of nanomaterials, and environmental applications such as photocatalysis and water separation membranes.
Two-dimensional graphene oxide (GO) has demonstrated considerable potential for advancing and even revolutionizing a number of environmental technologies, such as engineered photocatalysts, sorbents, antimicrobial coatings, and membranes. However, current GO application potential is, to some degree, limited by a lack of industrially scalable approaches to produce monomeric and aggregation-resistant GO nanostructures/ composites. To address this scientific and engineering gap, an aerosol-based process was developed to engineer 2D nanosheets of GO into 3D crumpled structures (crumpled GO, CGO), which have excellent aggregation- and compression-resistant properties, while allowing for the incorporation (encapsulation) of other (multi)functional particles, for tunable composite materials. Among a number of promising CGO material applications, the design, fabrication, and performance of CGOPolymer composite membranes will be presented and discussed in detail. Assemblies of CGO nanoparticles demonstrate superior permeation, separation, and reactive (photo-reactive and antimicrobial) properties. Furthermore, in situ surfacebased photocatalyzed synthesis of Ag nanoparticles at the surface of membrane assemblies is demonstrated as an approach to (re)generate, and thus maintain, enhanced antimicrobial activity. Lastly, opportunities and challenges associated with CGO integration/application in membrane technologies at the industrial scale will be discussed.
Organizer / Host: Kim Coleman, (314) 935-5548