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SUMMARY:Muon Studies of the Proton Conducting Polymer Nafion
DTSTART;VALUE=DATE-TIME:20220829T162000Z
DTEND;VALUE=DATE-TIME:20220829T164000Z
DTSTAMP;VALUE=DATE-TIME:20220826T110254Z
UID:indico-contribution-3713@indico.stfc.ac.uk
DESCRIPTION:Speakers: Francis Pratt (STFC)\nThe fluorinated ionomer Nafion
 \, first discovered by the DuPont company\, is a material that provides ef
 ficient proton conducting membranes for application in important technolog
 ical areas such as hydrogen fuel cells. Although many aspects of the polym
 er have been studied in relation to these applications\, the microscopic m
 echanisms for proton transport in this polymer are still only poorly under
 stood. We have therefore applied implanted muon techniques to the study of
  Nafion\, aiming to to gain information about these mechanisms via the muo
 n acting as a local spin probe. Our results indicate that the muon is high
 ly sensitive to the hydration state of the polymer and to the dynamical pr
 ocesses of the various sub-phases within the material. A three component m
 odel is found to describe the data well. This model has one F-$\\mu$-F com
 ponent reflecting muons in the PTFE-like polymer matrix\, a second compone
 nt representing quasi-static environments that are not closely coupled to 
 the F atoms and a third component encompassing highly dynamic proton-coupl
 ed environments. The properties have been studied within this modelling fr
 amework as a function of temperature and hydration level.\n\nhttps://indic
 o.stfc.ac.uk/event/53/contributions/3713/
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3713/
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