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BEGIN:VEVENT
UID:2026091612381320161110T11000020161110T1200006aa9e4f56754e@uic.edu
CATEGORIES:MEETING
STATUS:TENTATIVE
DTSTAMP:20190617T120806
DTSTART:20161110T110000
DTEND:20161110T120000
SUMMARY:Murugappan Muthukumar, University of Massachusetts
DESCRIPTION:The Ordinary-Extraordinary Transition in Dynamics of Solutions of Charged Molecules  Hosted by: Vivek Sharma    Abstract:  Dynamic light scattering measurements on dilute salt-free polyelectrolyte solutions have shown over the past three decades that there are two distinctive diffusive modes: fast, and slow.  The diffusion coefficient deduced from the fast mode has been found to be essentially independent of molar mass and polymer concentration and it is merely a factor of four smaller than that of small electrolyte ion such as sodium or potassium ion. The diffusion coefficient deduced from the slow mode is much smaller suggestive of clumps of many chains although these chains are similarly charged. Upon addition of sufficient amount of small molecular salts, the fast and slow modes merge together and the deduced diffusion coefficient is within the expected value for uncharged polymers. We will present a theory for these observed behaviors based on the coupling between the polyelectrolyte chains and their counterions.      \n | Event post: https://che.uic.edu/events?page_id=1050
LOCATION:CEB 218 810 S. Clinton Street  Chicago IL 60612
CLASS:PRIVATE
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