Date(s) - 09/27/2016
4:00 pm - 5:00 pm
Xianggui Ye was born in Zhejiang Province, China. He obtained his B. S. degree in 2000 and M. S. degree in 2003 from Jilin University, China, majoring in Applied Chemistry and Analytical Chemistry, respectively. In 2007, he obtained his PhD degree from Changchun Institute of Applied Chemistry, Chinese Academy of Sciences under the direction of Prof. Lijia An, majoring in Physics and Chemistry of Polymers, and received the “President Excellence Award” rewarded by Chinese Academy of Sciences. In turn, he joined Prof. Bamin Khomami’s group at Chemical and Biomolecular Engineering department, University of Tennessee-Knoxville. He has published 19 peer-reviewed journal papers (16 as first author) in ACS Nano, Macromolecules, Macromolecular Rapid Communication, Physical Chemistry Chemical Physics, Journal of Physical Chemistry B, et al. His research interests include polymer structure and morphology, directed self-assembly , hierarchical ordering of synthetic systems, block copolymer based membranes, polymer nanoparticle formation and its assembly as well as multifunctional hierarchical nanoparticles derived from block copolymers.
“Self/Directed Assembly of Block Copolymer Solutions: Mechanistic Insight to Design Multifunctional Materials“
Block copolymers are comprised of two or more chemically bonded blocks with dissimilar chemistries that can self-assemble into various well-defined nanostructures such as spheres, cylinders, and lamellae. Due to their diverse nanoscale structures, block copolymers have a wide array of applications including membranes, lithographic template, nanophotonic, hybrid materials, medicinal applications, nanoreactors, and stimuli-responsive materials. One of the most common pathways to create these nanostructures is self/directed assembling in solution. Therefore, it is crucial to understand whether the block copolymer in a solvent forms micelle or not and if yes, its structure as well as the experimental condition’s effect such as external agitation, on nanostructure formation. In this talk, I will focus on the fundamentals of block copolymer self-assembly in solution with the aim of paving the way for mechanistic understanding of block copolymer based membrane formation by Non-solvent Induced Phase Separation (NIPS) process. Specifically, the details of: (1) crew-cut micelle formation in a good solvent for all blocks, (2) crew-cut micelle response to non-solvent addition, (3) how to tune micelle size by blending, and (4) how external agitation affect on the aforementioned processes will be discussed. In turn, the fundamental understanding derived from this research to design and synthesis of multifunctional materials based on block copolymers will be highlighted.