Jornadas CeFEMA 2019

Session

Complex Fluids NMR

17 Sept 2019, 11:10

Anfiteatro Abreu Faro (Instituto Superior Tecnico, Campus Alameda)

Conveners

Complex Fluids NMR

• Pedro Sebastião (CeFEMA)

9. NMR Relaxometry in Complex Soft-Matter Systems: Experimental Results and Model Fitting

Pedro Sebastião

17/09/2019, 11:10

Molecular order and dynamics of the CB-C9-CB liquid crystalline dimer exhibiting the nematic (N) and the twist bend nematic (Ntb) phases [1-2] were investigated by proton NMR spectroscopy, using fields of 0.78 T and 7.04 T, and relaxometry. The first relaxometry experiments for a very wide Larmor frequency domain (8 kHz–300 MHz) on this system, using a combination of standard and fast field...

10. 1H NMR relaxation study of molecular dynamics in the nematic and NT-B phases formed by the liquid crystal dimer DTC5C7

Anant Kumar

17/09/2019, 11:20

Liquid crystalline dimers linked by an odd numbered hydrocarbon spacer are of significant interest due to their LC polymorphism, specifically due to the formation of the Ntb phase [1] in some of the LC dimers. The Ntb phase has been discovered recently and, the detailed description and understanding at the molecular level in this phase is still qualitative. In this work, by using a range of...

11. NMR study of the molecular dynamics in magnetic and non-magnetic ionic liquids

Maria Beira

17/09/2019, 11:35

Recent studies [1-3] have shown a considerably large paramagnetic relaxation enhancement associated with mixtures comprising magnetic ionic liquids (MILs) (based on either [Aliquat]+ or [P66614]+ cations and on a [FeCl4]- anionic complex) and their analogous ionic liquids (respectively [Aliquat][Cl] and [P66614][Cl]). These properties were, however, destroyed when the same amount of...