The still undiscovered fluid ferroelectric nematic phase is expected to exhibit amuch faster and easier response to an external electric field compared toconventional ferroelectric smectic liquid crystals; therefore, the discovery ofsuch a phase could open new avenues in electro-optic device technology.Here, experimental evidence of a ferroelectric response to a switching electricfield in a low molarmass nematic liquid crystal is reported and connected withfield-induced biaxiality. The fluid is made of bent-core polar molecules and isnematic over a range of 120 -C. Combining repolarization currentmeasurements, electro-optical characterizations, X-ray diffraction andcomputer simulations, ferroelectric switching is demonstrated and it isconcluded that the response is due to field-induced reorganization of polarcybotactic groups within the nematic phase. This work represents significantprogress toward the realization of ferroelectric

Ferroelectric Response and Induced Biaxiality in the Nematic Phase of a Bent-Core Mesogen

SCARAMUZZA, Nicola;
2009

Abstract

The still undiscovered fluid ferroelectric nematic phase is expected to exhibit amuch faster and easier response to an external electric field compared toconventional ferroelectric smectic liquid crystals; therefore, the discovery ofsuch a phase could open new avenues in electro-optic device technology.Here, experimental evidence of a ferroelectric response to a switching electricfield in a low molarmass nematic liquid crystal is reported and connected withfield-induced biaxiality. The fluid is made of bent-core polar molecules and isnematic over a range of 120 -C. Combining repolarization currentmeasurements, electro-optical characterizations, X-ray diffraction andcomputer simulations, ferroelectric switching is demonstrated and it isconcluded that the response is due to field-induced reorganization of polarcybotactic groups within the nematic phase. This work represents significantprogress toward the realization of ferroelectric
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/20.500.11770/155519
 Attenzione

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 169
  • ???jsp.display-item.citation.isi??? 165
social impact