Low transition temperature organosiloxane liquid crystals displaying a de Vries smectic A phase

J. Naciri; C. Carboni; A. K. George

doi:10.1080/0267829021000060250

Low transition temperature organosiloxane liquid crystals displaying a de Vries smectic A phase

J. Naciri^*, C. Carboni, A. K. George

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

The synthesis, phase properties and electro-optic response of two new chiral low molar mass organosiloxane liquid crystalline materials are presented. The structure of the molecule contains a short (three silicon atoms) siloxy chain attached via a hydrocarbon chain to the non-chiral end of a chiral mesogenic moiety. The materials have low melting points (> -20°C) and broad smectic phase ranges (∼80°C wide) extending to below room temperature. Both materials are electroclinic at room temperature. A 30° tilt of the optic axis can be achieved in fields of the order of 25 V μm^-1. The data presented indicate that in these materials the smectic phase is a de Vries-type smectic A phase. The electroclinic effect arises because the electric field produces a bias in the distribution of the direction of the tilt.

Original language	English
Pages (from-to)	219-225
Number of pages	7
Journal	Liquid Crystals
Volume	30
Issue number	2
DOIs	https://doi.org/10.1080/0267829021000060250
Publication status	Published - Feb 1 2003

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1080/0267829021000060250

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title = "Low transition temperature organosiloxane liquid crystals displaying a de Vries smectic A phase",

abstract = "The synthesis, phase properties and electro-optic response of two new chiral low molar mass organosiloxane liquid crystalline materials are presented. The structure of the molecule contains a short (three silicon atoms) siloxy chain attached via a hydrocarbon chain to the non-chiral end of a chiral mesogenic moiety. The materials have low melting points (> -20°C) and broad smectic phase ranges (∼80°C wide) extending to below room temperature. Both materials are electroclinic at room temperature. A 30° tilt of the optic axis can be achieved in fields of the order of 25 V μm-1. The data presented indicate that in these materials the smectic phase is a de Vries-type smectic A phase. The electroclinic effect arises because the electric field produces a bias in the distribution of the direction of the tilt.",

author = "J. Naciri and C. Carboni and George, {A. K.}",

note = "Funding Information: The authors acknowledge the financial support of the Office of Naval Research and the Sultan Qaboos University project IG/SCI/PHYS/99/01.",

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T1 - Low transition temperature organosiloxane liquid crystals displaying a de Vries smectic A phase

AU - Naciri, J.

AU - Carboni, C.

AU - George, A. K.

N1 - Funding Information: The authors acknowledge the financial support of the Office of Naval Research and the Sultan Qaboos University project IG/SCI/PHYS/99/01.

PY - 2003/2/1

Y1 - 2003/2/1

N2 - The synthesis, phase properties and electro-optic response of two new chiral low molar mass organosiloxane liquid crystalline materials are presented. The structure of the molecule contains a short (three silicon atoms) siloxy chain attached via a hydrocarbon chain to the non-chiral end of a chiral mesogenic moiety. The materials have low melting points (> -20°C) and broad smectic phase ranges (∼80°C wide) extending to below room temperature. Both materials are electroclinic at room temperature. A 30° tilt of the optic axis can be achieved in fields of the order of 25 V μm-1. The data presented indicate that in these materials the smectic phase is a de Vries-type smectic A phase. The electroclinic effect arises because the electric field produces a bias in the distribution of the direction of the tilt.

AB - The synthesis, phase properties and electro-optic response of two new chiral low molar mass organosiloxane liquid crystalline materials are presented. The structure of the molecule contains a short (three silicon atoms) siloxy chain attached via a hydrocarbon chain to the non-chiral end of a chiral mesogenic moiety. The materials have low melting points (> -20°C) and broad smectic phase ranges (∼80°C wide) extending to below room temperature. Both materials are electroclinic at room temperature. A 30° tilt of the optic axis can be achieved in fields of the order of 25 V μm-1. The data presented indicate that in these materials the smectic phase is a de Vries-type smectic A phase. The electroclinic effect arises because the electric field produces a bias in the distribution of the direction of the tilt.

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Low transition temperature organosiloxane liquid crystals displaying a de Vries smectic A phase

Abstract

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