MSE Seminar - Professor David Hoagland, Univ. of Massachusetts, Amherst
Professor and Head
Department of Polymer Science and Engineering
University of Massachusetts Amherst
“Polymers, Proteins, and Particles in Ionic Liquids”
Ionic liquids, defined as salts that melt near or below room temperature, present attractive solvent properties for soft matter systems, as will be discussed for (i) neutral and charged polymers, (ii) proteins, and (iii) nanoparticles. One characteristic property, nonvolatility, enables the application of high vacuum methods such as electron microscopy to highly solvated, and thus highly dynamic, nanoscopic systems. Here, electron microscopy methods that visualize ‘wet’ samples in movies are described, taking as a model the movements and interactions of dispersed nanoparticles; unusual thin film effects are uncovered. Ionic liquids also display striking solvency properties, as outlined for polyelectrolytes, crystallizable polymers, polyzwitterions, and proteins. For the last of these, neat ionic liquids afford solvent environments distinct from aqueous electrolytes, preserving most, but perhaps not all, elements of structure and activity.
Professor David A. Hoagland is Professor and Head of the Polymer Science and Engineering Department at the University of Massachusetts Amherst. He received a B.S. degree in Chemical Engineering from Stanford University in 1980, and M.A. and Ph.D. degrees in the same field from Princeton University in 1981 and 1986, respectively. His subsequent career has been entirely at the University of Massachusetts Amherst, where he rose to Professor in 2003; since 2010, he has also been a Distinguished Guest Professor at the Changchun Institute of Applied Chemistry of the Chinese Academy of Sciences. Hoagland’s research interests encompass the structure and dynamics of soft matter polymer systems such as solutions and gels, with current projects in ionic liquids, carbon nanotube interfacial assembly, layer-by-layer polyelectrolyte deposition, and protein coacervation. He is a Fellow of the American Physical Society and named a Sigma Xi Distinguished National Lecture for 2004-7.