Tittle: Study of NMR superparamagnetic relaxation effects in magnetic ionic liquids

Detailed Description

IL, MILs, non-IL/MIL, IL/MIL systems will be studied by NMR, diffusometry and viscometry. We will investigate which conditions are required to obtain a superparamagnetic relaxation response of the systems in order to be possible to optimize and tune MILs for different specific uses. 

The proton T1 will be measured for a large domain of Larmor frequencies (10 kHz - 500 MHz). A Fast Field Cycling NMR relaxometer will be used to cover the frequency range from 10 kHz to 10 MHz, a Bruker variable field and a Avance II NMR console will be used for measurements in the frequency range 10-100 MHz, and finally two NMR spectrometers operating at 300 MHz and 500 MHz will complete the list of NMR equipment used. In addition, the self-diffusion constants measurements will be made in the studied systems by pulse field gradient NMR. The viscosity and self-diffusion measurements will be measured as a function of the magnetic field within the frame of both national and international collaborations (João Paulo Crespo, Carla Portugal, Helena Godinho in FCT-UNL, Tomaz Apih, Anton Gradisek in Institute Jozef Stefan, University of Ljubljana, Slovenia).

This project comprises the study of two imidazolium-based MILs systems and two cholinium-based MILs. The imidazolium-based MILs are less water solubles but the cations are less bulkier than those of ammonium and phosphonium salts.