You are here

James A. Morrison Lecturer Seminar - Professor Frank S. Bates, University of Minnesota

Event Date: 
Monday, January 29, 2018 - 3:30pm to 4:30pm
Sphericity and Symmetry Breaking in the Formation of Quasicrystals and Frank-Kasper Phases in Block Polymer Melts Spherical objects ranging in size from metal atoms to micron scale colloidal particles to billiard balls tend to form regular close packed arrays with three-dimensional translational symmetry. This lecture will describe how nearly spherical nanoscale micelles, formed by self-assembled diblock copolymers, spontaneously evolve into a 2-dimensional dodecagonal quasicrystal (DDQC) following rapid cooling from the disordered liquid state. This aperiodic arrangement, characterized by rotational symmetry but not translational symmetry, transforms over time into a 3-dimensional Frank-Kasper (FK)  phase with local tetrahedral particle packing. This discovery suggests that certain forms of quasicrystalline order are non-equilibrium states generated by kinetically facilitated particle clustering in the supercooled liquid. Redistribution of polymer molecules between micelles through molecular diffusion appears to play a central role in these processes. Surprising analogies will be drawn between the heretofore unexplained formation of FK structures in soft materials, and in certain elemental metals (including manganese and uranium) and alloys, highlighting opportunities to better understand space filling in hard and soft materials by investigation of block polymers with precisely tuned molecular architectures. Frank S. Bates is a Regents Professor and a member of the Chemical Engineering and Materials Science department at the University of Minnesota. He received a B.S. in Mathematics from SUNY Albany in 1976, and M.S. and Sc.D. degrees in Chemical Engineering from MIT in 1979 and 1982. Between 1982 and 1989 Bates was a member of the technical staff at AT&T Bell Laboratories then joined the University of Minnesota as an Associate Professor. He was promoted to Professor in 1991, named a Distinguished McKnight University Professor in 1996, served as department Head from 1999 to 2014, and became a Regents Professor in 2007. Professor Bates conducts research on a range of topics related to polymers, with a particular focus on the thermodynamics and dynamics of block polymers and blends. In 1988 Bates was named a Distinguished Member of the Technical Staff at Bell Labs, in 1989 he received the John H. Dillon Medal and in 1997 the Polymer Physics Prize, both from the American Physical Society where he is a Fellow. He received the 2004 David Turnbull Lectureship Award from the Materials Research Society, shared the ACS Cooperative Research Award in 2008, was awarded the 2008 Sustained Research Prize by the Neutron Scattering Society of America and he was the 2012 Institute Lecturer of the American Institute of Chemical Engineers. Bates was elected to the US National Academy of Engineering in 2002 the American Academy of Arts & Sciences in 2010, and the US National Academy of Sciences in 2017.
Event Location: 
Location Details: 
Burke Science Building (BSB) 108