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Seminar 9/17/2014 - David Hoagland, University of Massachusetts-Amherst: Polymers, Proteins, and Particles in Ionic Liquids

Abstract: 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, charged, zwitterionic, and crystallizable polymers, (ii) enzymatic proteins, and (iii) dispersed nanoparticles. One characteristic property, nonvolatility, enables the application of high vacuum methods such as electron microscopy to highly solvated, and thus highly dynamic, systems.  Here, electron microscopy methods that visualize ‘wet’ samples are described, taking as a model case the movements and interactions of nanoparticles; unusual thin film effects are uncovered. Ionic liquids also display striking solvency properties, as outlined for polyelectrolytes, polyzwitterions, and proteins. For the last of these, neat ionic liquids afford solvent environments distinct from aqueous electrolytes, preserving most, but not all, elements of structure and activity.

Bio: Hoagland is Professor and Head of the Polymer Science and Engineering Department at the University of Massachusetts Amherst. He has been in the same department since beginning his independent academic career in 1985.  Undergraduate and graduate degrees in Chemical Engineering are from Stanford and Princeton, respectively. Hoagland’s research focuses on structure and dynamics in soft polymeric systems such as gels and solutions, with current projects in ionic liquids, carbon nanotube assembly, and protein coacervation.

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Location: Bowen Hall Auditorium

Date/Time: 09/17/14 at 12:00 pm - 09/17/14 at 1:00 pm

Category: PRISM/PCCM Seminar Series

Department: PRISM