Bibliographic Details
| Title: |
NON-ARRHENIUS BEHAVIOUR OF NMR SELF-DIFFUSION OF THE NEAT ROOM TEMPERATURE IONIC LIQUID 1-BUTYL-3- METHYL IMIDAZOLIUM TETRAFLUOROBORATE [BMIM][BF4]. |
| Alternate Title: |
NE ARENIJAUS TIPO DIFUZIJA JONINIAME SKYSTYJE 1-BUTIL-3- METILIMIDAZOLIO TETRAFLUOROBORATE [BMIM][BF4 ], TIRTA DOSY BMR METODU. |
| Authors: |
Klimavičius, V.1 vytautas.klimavicius@ff.vu.lt, Gdaniec, Z.2 |
| Source: |
Lithuanian Journal of Physics. 2026, Vol. 66 Issue 2, p69-74. 6p. |
| Subjects: |
Diffusion coefficients, Arrhenius equation, Glass transition temperature, Ionic liquids, Nuclear magnetic resonance spectroscopy |
| Abstract (English): |
Room temperature ionic liquid (RTIL) 1-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4 ]) was investigated using 1 H, 19F, 11B and 10B DOSY NMR spectroscopy in a temperature range of 288-338 K. The dynamics of the [BF4 ] anion and [bmim] cation have been found to be similar, indicating that both constituents behave as a rigid unit in the studied temperature range. The diffusion coefficients varied from 6.9 ∙ 10-11 m² s-1 at the highest temperature to 6.1 ∙ 10-12 m² s-1 at the lowest temperature. The dynamics of the diffusion coefficient was found not obeying the Arrhenius law and therefore was analyzed using the Vogel-Fulcher-Tammann (VFT) equation for the diffusivity. The glass transition temperature was found to be in a range of 172-181 K, which coincides with the values obtained using other techniques and found in the literature; the parameter B which is related to activation energy was found equal to 828-1115 K. [ABSTRACT FROM AUTHOR] |
| Abstract (Lithuanian): |
Kambario temperatūros joninis skystis (RTIL) 1-butil-3-metilimidazolio tetrafluoroboratas ([bmim] [BF4 ]) buvo tirtas 288-338 K temperatūrų intervale naudojant 1 H, 19F, 11B ir 10B DOSY (Diffusion Ordered Spectroscopy) branduolių magnetinio rezonanso (BMR) spektroskopiją. Nustatyta, kad [BF4 ] anijono ir [bmim] katijono dinamika yra palyginama, todėl galima teigti, jog RTIL dinamika yra vienoda tirtame temperatūrų intervale. Difuzijos koeficientai kito nuo 6,9 ∙ 10-11 m²/s esant aukščiausiai temperatūrai iki 6,1∙10-12 m-2/s esant žemiausiai temperatūrai. Nustatyta, kad difuzijos koeficiento temperatūrinė priklausomybė neatitinka Arenijaus dėsnio, todėl ji buvo analizuota naudojant Vogelio-Fulcherio-Tammanno (VFT) lygtį difuzijos procesui aprašyti. Tirtajam RTIL stiklėjimo temperatūra nustatyta 172-181 K intervale; ši vertė sutampa su reikšmėmis, gautomis kitais metodais ir pateikiamomis literatūroje. Parametras B, susijęs su aktyvacijos energija, nustatytas lygus 828-1115 K. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
