Influence of confining geometry on the behaviour of a FLC sample having TGBA phase

T Ray, S Kundu, SK Roy, SS Roy, JAD McLaughlin

Research output: Contribution to journalArticle

Abstract

We report on the dielectric permittivities in 1 kHz to 4 MHz frequency region of the ferroelectric liquid crystal (FLC) material CB500 having a TGBA phase. Molecular and collective relaxation processes have been studied in bulk and in confined environment. In the bulk sample, a Goldstone mode (GM) and a molecular mode were observed in the SmC* phase and the softmode (SM) was observed in the TGBA phase. The Goldstone mode was also present in the FLC sample confined in 0.2 μm Anopore membranes. The relaxation frequency of this mode was shifted to the higher-frequency region in comparison to that observed in the bulk sample. In the Anopore confined FLC sample, another relaxation process (AP) was observed, which possibly arises due to some collective movement of the molecules attached to the cavity walls. The relaxation frequency of this process is almost independent of temperature and this process is only observed in the SmC* phase. Copyright World Scientific 2004
LanguageEnglish
Pages4119-4128
JournalInternational Journal of Modern Physics B [Condensed Matter Physics; Statistical Physics; Applied Physics]
Volume18
Issue number31 & 3
DOIs
Publication statusPublished - 2004

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confining
liquid crystals
geometry
molecular relaxation
permittivity
membranes
cavities
molecules
temperature

Keywords

  • Dielectric
  • ferroelectricity
  • confined geometry
  • Anopore

Cite this

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title = "Influence of confining geometry on the behaviour of a FLC sample having TGBA phase",
abstract = "We report on the dielectric permittivities in 1 kHz to 4 MHz frequency region of the ferroelectric liquid crystal (FLC) material CB500 having a TGBA phase. Molecular and collective relaxation processes have been studied in bulk and in confined environment. In the bulk sample, a Goldstone mode (GM) and a molecular mode were observed in the SmC* phase and the softmode (SM) was observed in the TGBA phase. The Goldstone mode was also present in the FLC sample confined in 0.2 μm Anopore membranes. The relaxation frequency of this mode was shifted to the higher-frequency region in comparison to that observed in the bulk sample. In the Anopore confined FLC sample, another relaxation process (AP) was observed, which possibly arises due to some collective movement of the molecules attached to the cavity walls. The relaxation frequency of this process is almost independent of temperature and this process is only observed in the SmC* phase. Copyright World Scientific 2004",
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TY - JOUR

T1 - Influence of confining geometry on the behaviour of a FLC sample having TGBA phase

AU - Ray, T

AU - Kundu, S

AU - Roy, SK

AU - Roy, SS

AU - McLaughlin, JAD

PY - 2004

Y1 - 2004

N2 - We report on the dielectric permittivities in 1 kHz to 4 MHz frequency region of the ferroelectric liquid crystal (FLC) material CB500 having a TGBA phase. Molecular and collective relaxation processes have been studied in bulk and in confined environment. In the bulk sample, a Goldstone mode (GM) and a molecular mode were observed in the SmC* phase and the softmode (SM) was observed in the TGBA phase. The Goldstone mode was also present in the FLC sample confined in 0.2 μm Anopore membranes. The relaxation frequency of this mode was shifted to the higher-frequency region in comparison to that observed in the bulk sample. In the Anopore confined FLC sample, another relaxation process (AP) was observed, which possibly arises due to some collective movement of the molecules attached to the cavity walls. The relaxation frequency of this process is almost independent of temperature and this process is only observed in the SmC* phase. Copyright World Scientific 2004

AB - We report on the dielectric permittivities in 1 kHz to 4 MHz frequency region of the ferroelectric liquid crystal (FLC) material CB500 having a TGBA phase. Molecular and collective relaxation processes have been studied in bulk and in confined environment. In the bulk sample, a Goldstone mode (GM) and a molecular mode were observed in the SmC* phase and the softmode (SM) was observed in the TGBA phase. The Goldstone mode was also present in the FLC sample confined in 0.2 μm Anopore membranes. The relaxation frequency of this mode was shifted to the higher-frequency region in comparison to that observed in the bulk sample. In the Anopore confined FLC sample, another relaxation process (AP) was observed, which possibly arises due to some collective movement of the molecules attached to the cavity walls. The relaxation frequency of this process is almost independent of temperature and this process is only observed in the SmC* phase. Copyright World Scientific 2004

KW - Dielectric

KW - ferroelectricity

KW - confined geometry

KW - Anopore

U2 - 10.1142/S0217979204026779

DO - 10.1142/S0217979204026779

M3 - Article

VL - 18

SP - 4119

EP - 4128

JO - International Journal of Modern Physics B

T2 - International Journal of Modern Physics B

JF - International Journal of Modern Physics B

SN - 0217-9792

IS - 31 & 3

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