Charge transport and glassy dynamics in ionic liquids

• Applicant: Professor Dr. Friedrich Kremer
• Subject Area: Physical Chemistry of Molecules, Liquids and Interfaces, Biophysical Chemistry
• Term: from 2006 to 2013
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 29405857

• Final Report Year: 2015

Final Report Abstract

The interplay between charge transport and glassy dynamics in Ionic Liquids (IL) was at the beginning of the above project a totally open topic. By combining different experimental techniques such as broadband dielectric spectroscopy (BDS), pulsed field gradient nuclear magnetic resonance (PFG-NMR), differential scanning calorimetry (DSC), and dynamic mechanical spectroscopy (DMS), it became possible to develop a full quantitative understanding: Whereas the absolute values of dc conductivity and viscosity vary over more than 11 decades with temperature and upon systematic structural variation of the ILs, agreement is found between the characteristic frequency of charge transport and the structural relaxation. This reflects the fact that charge transport and glassy dynamics in IL can be fully traced back to the equations of rotational and translational diffusion as developed by Einstein, Stokes-Einstein and Einstein-Smoluchowski.

Publications

• "Charge transport and glassy dynamics in imidazole-based liquids" J. Chem. Phys. 129, 234511-1 (2008)
  Iacob, C.; J. Sangoro, A. Serghei, S. Naumov, Y. Korth, J. Kärger, C. Friedrich and F. Kremer
  
• "Charge transport and mass transport in imidazolium based ionic liquids" Phys. Rev. E 77, 051202 (2008)
  Sangoro Rume, J.; A. Serghei, S. Naumov, P. Galvosas, J. Kärger, C. Wespe, F. Bordusa and F. Kremer
  
• "Electrical conductivity and translational diffusion in the 1-butyl-3-methyllimidazolium tetrafluoroborate ionic liquid" J. Chem. Phys. 128, 214509 (2008)
  ) Sangoro Rume, J.; C. Iacob, A. Serghei, S. Naumov, P. Galvosas, J. Kärger, C. Wespe, F. Bordusa, A. Stoppa, J. Hunger, R. Buchner, F. Kremer
  
• "Universal scaling of charge transport in glass-forming ionic liquids" Phys. Chem. Chem. Phys. 11, 913-916 (2009)
  Sangoro, J. R., C. Iacob, A. Serghei, C. Friedrich and F. Kremer
  
• ”Measurement of forces between room temperature ionic liquids between mica surfaces” J. of Physical Chemistry C 113, (37) pp.16445-16449 (2009)
  Min, Y., M. Akbulut, J.R. Sangoro, F. Kremer, R.K. Prud’homme, J. Israelachvili
  
• "Charge transport and diffusion of ionic liquids in nanoporous silica membranes" Phys. Chem. Chem. Phys. 12, 41 p.13798-13803 (2010)
  C. Iacob, J. R. Sangoro, P. Papadopoulos, T. Schubert, S. Naumov, R. Valiullin, J. Kärger and F. Kremer
  
• ”Charge transport and dipolar relaxations in imidazolium-based ionic liquids” J. Phys. Chem. B, 114(1), 382-386 (2010)
  Krause, C., J.R. Sangoro, C. Iacob and F. Kremer
  
• ”Correlation between polarity parameters and dielectric properties of [Na][TOTO] – a sodium ionic liquid” Phys. Chem. Chem. Phys. 12, 14341-14350 (2010)
  Zech,O., J. Hunger, J.R. Sangoro, C. Iacob, F. Kremer, W. Kunz, R. Buchner
  
• “Diffusion in ionic liquids: the interplay between molecular structure and dynamics” Soft Matter 7, 1678-1681 (2011)
  Sangoro, J. R., Iacob, C., Naumov, S., Hunger, J., Rexhausen, H., Valiullin, R., Strehmel, V., Buchner, R., Kärger, J., and Kremer, F.
  
• “How hydrogen bonds influence the mobility of imidazolium- based ionic liquids: A combined theoretical and experimental study of 1-n-butyl-3-methylimidazolium bromide“ J. Phys. Chem. B 115, (51) 15280-15288 (2011)
  Kohagen, M., M. Brehm, Y. Lingscheid, R. Giernoth, C. Iacob, J.R. Sangoro, R. Valiullin, J. Kärger, F. Kremer, and B. Kirchner
  
• “Rotational and translational diffusion in glass-forming N,N, -diethyl-3- methylbenzamide (DEET)” Soft Matter, 7, (22) 10565-10568 (2011)
  Sangoro, J.R., C. Iacob, R. Valiullin, C. Friedrich, J. Kärger, F. Kremer
  
• “Brownian dynamics determine the universality of charge transport in ionic liquids” RSC Adv. 2, 5047-5050 (2012)
  Sangoro, J.R., M. Mierzwa, C. Iacob, M. Paluch, F. Kremer
  
• “Charge transport and glassy dynamics in ionic liquids” Acc. Chem. Res. 45 (4), 525–532 (2012)
  Sangoro, J.R., F. Kremer
  
• “Enhanced charge transport in nano-confined ionic liquids“ Soft Matter 8, 289-293 (2012)
  Iacob, C., J. R. Sangoro, W.K. Kipnusu, J. Kärger, F. Kremer