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SUMMARY:Near-surface dynamics of 1-ethyl-3-methylimidazolium acetate above
  and below the glass transition
DTSTART;VALUE=DATE-TIME:20220829T164000Z
DTEND;VALUE=DATE-TIME:20220829T170000Z
DTSTAMP;VALUE=DATE-TIME:20220826T110301Z
UID:indico-contribution-3723@indico.stfc.ac.uk
DESCRIPTION:Speakers: Derek Fujimoto (TRIUMF)\nIonic liquids (ILs) are a c
 lass of molten salts which are liquid at room temperature. Their propertie
 s are determined by strong electrostatic forces and generally include low 
 volatility\, negligible vapour pressure\, and a low melting point. This ma
 kes them attractive candidates for improving battery and capacitor technol
 ogy. The device effectiveness\, however\, is often determined by the ion a
 rrangement and dynamics at the interface between the IL electrolyte and th
 e electrode.\n\nA much simpler interface is that of the free surface (vacu
 um interface). Studies of IL surface chemistry reveal a number of surprisi
 ng phenomena\, such as orientational ordering and regions of surface cryst
 allization. As the ionic constituents may differ greatly in size and shape
 \, many ILs do not crystallize (other than at the surface\, perhaps) and w
 ill instead vitrify. The unusual behaviour of ILs may help to reveal novel
  aspects of glassy dynamics.\n\nHaving demonstrated that $\\beta$-NMR was 
 a good probe of IL solvation dynamics and dynamic heterogeneity\,$^1$ we n
 ow turn to the question of how the surface modifies these properties\, pre
 senting the first depth-resolved $\\beta$-NMR measurements in 1-ethyl-3-me
 thylimidazolium acetate. The surface clearly has a large dynamical effect 
 in the glassy phase: there is enhancement in the relaxation rate near the 
 surface\, resembling a more liquid-like state\, yet no significant change 
 in the dynamical heterogeneity. Additionally\, the relaxation grows faster
  as the material is cooled through the glass transition temperature. These
  two latter aspects are very surprising\, and are an extreme departure fro
 m the behaviour of other glasses.$^2$\n\n$^1$Fujimoto\, D. et al. Chem. Ma
 ter. 31\, 9346–9353 (2019).\n$^2$McKenzie\, I. et al. J. Chem. Phys. 156
 \, 084903 (2022).\n\nhttps://indico.stfc.ac.uk/event/53/contributions/3723
 /
LOCATION:Science and Technology Campus\, University of Parma
URL:https://indico.stfc.ac.uk/event/53/contributions/3723/
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