Cholesteric thermo-reversible liquid-crystal gels : phase behaviour and electro-optical response

R.H.C. Janssen, J.P. Teunissen, S.J. Picken, C.W.M. Bastiaansen, D.J. Broer, T.A. Tervoort, P. Smith

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Abstract

Thermo-reversible gels of a chiral nematic liq.-crystal (LC) with 12-hydroxyoctadecanoic acid (HOA) were cast in a light-reflecting planar configuration by choosing a processing temp. higher than the sol-gel temp. but lower than the onset-temp. for the chiral nematic-isotropic transition in the gel. The choice of processing temp. is dictated by the quasi-ternary phase diagram of the system, which displays a 3-phase region at which an isotropic liq. is in equil. with a fibrillar solid and a chiral nematic mesophase. Planar configurations of the gels produced show a significant broadening of the reflection band with respect to the neat LC-material indicating a distribution of the cholesteric pitch within the gel. Viscoelasticity, electrooptical activity and zero elec. field bistability of gelled films has been utilized in building a reflective bistable chiral nematic cell with improved shock-resistance that holds the promise of being produced via a continuous processing route. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)2372-2377
JournalJapanese Journal of Applied Physics, Part 1 : Regular Papers and Short Notes & Review Papers
Volume40
Issue number4A
DOIs
Publication statusPublished - 2001

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Phase behavior
Liquid crystals
Gels
liquid crystals
gels
Processing
Viscoelasticity
shock resistance
Phase diagrams
Sol-gels
viscoelasticity
display devices
configurations
casts
Crystals
routes
phase diagrams
Acids
acids
cells

Cite this

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title = "Cholesteric thermo-reversible liquid-crystal gels : phase behaviour and electro-optical response",
abstract = "Thermo-reversible gels of a chiral nematic liq.-crystal (LC) with 12-hydroxyoctadecanoic acid (HOA) were cast in a light-reflecting planar configuration by choosing a processing temp. higher than the sol-gel temp. but lower than the onset-temp. for the chiral nematic-isotropic transition in the gel. The choice of processing temp. is dictated by the quasi-ternary phase diagram of the system, which displays a 3-phase region at which an isotropic liq. is in equil. with a fibrillar solid and a chiral nematic mesophase. Planar configurations of the gels produced show a significant broadening of the reflection band with respect to the neat LC-material indicating a distribution of the cholesteric pitch within the gel. Viscoelasticity, electrooptical activity and zero elec. field bistability of gelled films has been utilized in building a reflective bistable chiral nematic cell with improved shock-resistance that holds the promise of being produced via a continuous processing route. [on SciFinder (R)]",
author = "R.H.C. Janssen and J.P. Teunissen and S.J. Picken and C.W.M. Bastiaansen and D.J. Broer and T.A. Tervoort and P. Smith",
year = "2001",
doi = "10.1143/JJAP.40.2372",
language = "English",
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pages = "2372--2377",
journal = "Japanese Journal of Applied Physics, Part 1 : Regular Papers and Short Notes & Review Papers",
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Cholesteric thermo-reversible liquid-crystal gels : phase behaviour and electro-optical response. / Janssen, R.H.C.; Teunissen, J.P.; Picken, S.J.; Bastiaansen, C.W.M.; Broer, D.J.; Tervoort, T.A.; Smith, P.

In: Japanese Journal of Applied Physics, Part 1 : Regular Papers and Short Notes & Review Papers, Vol. 40, No. 4A, 2001, p. 2372-2377.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Cholesteric thermo-reversible liquid-crystal gels : phase behaviour and electro-optical response

AU - Janssen, R.H.C.

AU - Teunissen, J.P.

AU - Picken, S.J.

AU - Bastiaansen, C.W.M.

AU - Broer, D.J.

AU - Tervoort, T.A.

AU - Smith, P.

PY - 2001

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AB - Thermo-reversible gels of a chiral nematic liq.-crystal (LC) with 12-hydroxyoctadecanoic acid (HOA) were cast in a light-reflecting planar configuration by choosing a processing temp. higher than the sol-gel temp. but lower than the onset-temp. for the chiral nematic-isotropic transition in the gel. The choice of processing temp. is dictated by the quasi-ternary phase diagram of the system, which displays a 3-phase region at which an isotropic liq. is in equil. with a fibrillar solid and a chiral nematic mesophase. Planar configurations of the gels produced show a significant broadening of the reflection band with respect to the neat LC-material indicating a distribution of the cholesteric pitch within the gel. Viscoelasticity, electrooptical activity and zero elec. field bistability of gelled films has been utilized in building a reflective bistable chiral nematic cell with improved shock-resistance that holds the promise of being produced via a continuous processing route. [on SciFinder (R)]

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