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Relaxation dynamics of ionic liquids in the glass phase ; A Pulsed EPR study (CROSBI ID 567732)

Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija

Rakvin, Boris ; Kattnig, Daniel ; Ilakovac-Kveder, Marina ; Grampp, Guenter Relaxation dynamics of ionic liquids in the glass phase ; A Pulsed EPR study // Joint EUROMAR 2010 and 17th ISMAR Conference. Firenza : München, 2010. str. 396-396

Podaci o odgovornosti

Rakvin, Boris ; Kattnig, Daniel ; Ilakovac-Kveder, Marina ; Grampp, Guenter

engleski

Relaxation dynamics of ionic liquids in the glass phase ; A Pulsed EPR study

Relaxation dynamics of ionic liquids in the glass phase ; A Pulsed EPR study B. Rakvin1, D. Kattnig2, M. Kvedr1 and G. Grampp2 1Ruđer Bošković Institute, Department of Physical Chemistry, Zagreb, Croatia 2Institute of Physical and Theoretical Chemistry, Graz University of Technology, Technikerstraße 4/I, A-8010 Graz, Austria Low melting organic salts or ionic liquids (ILs) have been frequently studied in the past decade. These investigations have focused on their ability to serve as solvents in green chemistry, batteries, their potential as phase-transfer catalysts etc. Moreover, ILs are interesting materials from a physical point of view as they allow us to modify the interactions between the molecular ions as well the interaction with other materials by chemically modifying the individual ionic molecules. Although crucial for understanding their properties in applications, very little is known about on their basic physical properties, especially on their glassy amorphous states (1). As molecular liquids ILs are also very good glass-formers and non-Debye and non-Arrhenius slow relaxation of molecular ions in the glassy amorphous states are expected as was suggested by a quasielastic neutron scattering study (2). In order to access some of dynamic features of glassy amorphous states, EPR spin probes have been employed. The measured spin-lattice (T1) and phase memory (Tm) relaxation times of spin probe (TANOL) imbedded in the three solid matrices of typical ILs show complex temperature behavior in the monitored low temperature interval (6 K - 80 K). The obtained data have been described in terms of relaxation processes in the molecular glass (3): direct relaxation process, local mode relaxation process and Raman relaxation process. The local mode with activation energy of 5 meV is associated with anion dynamics since, obtained an effective Debye temperature is more associated with dynamic modes of cation in the monitored ILs matrices. . (1) O. Yamamuro , Y. Minamimoto, Y. Inamura, S. Hayashi and H. Hamaguchi, Chem. Phys. Lett. 423 (2006) 371–375 (2) A. Triolo, O. Russina, V. Arrighi, F. Juranyi, S. Janssen, C.M. Gordon, J. Chem. Phys. 119 (2003) 8549 (3) M. Kvedr, D. Merunka, M. Jokić, J. Makarević and B. Rakvin, Phys. Rev. B 80, 052201 (2009)

Ionic solutions ; Pulsed EPR

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Podaci o prilogu

396-396.

2010.

objavljeno

Podaci o matičnoj publikaciji

Joint EUROMAR 2010 and 17th ISMAR Conference

Firenza : München:

Podaci o skupu

Joint EUROMAR 2010 and 17th ISMAR Conference

poster

04.07.2010-09.07.2010

Firenca, Italija

Povezanost rada

Fizika, Kemija