6533b7d7fe1ef96bd1269001
RESEARCH PRODUCT
Gelling and the collective dynamics in ferroelectric liquid crystals
Ulrich MaschkeRudolf ZentelMartin BrehmerRachid Mezianesubject
SemicarbazideMaterials scienceSelf assembleGeneral ChemistryCondensed Matter PhysicsFerroelectricityDielectric spectroscopySpontaneous polarizationchemistry.chemical_compoundCrystallographychemistryChemical physicsLiquid crystalCollective dynamicsdescription
Dielectric spectroscopy has been applied to investigate the dynamic behaviour of a ferroelectric liquid crystal in the smectic C* and smectic A phases confined in gel matrices of a fibre like (1D) or platelet like (2D) structure. These gel matrices were obtained from semicarbazide or bis-acylurea derivatives, which self assemble because of their H-bonding motif. The confinement strongly influences the magnitude of the spontaneous polarization and the collective fluctuations of the director detected as the Goldstone-mode. It is thus possible to detect gelation by dielectric spectroscopy. By this method it was possible to follow the destruction and restoration of the gel structure induced by the photochemical trans-cis isomerisation.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2020-09-10 | Soft Matter |