Abstract
Monomesogen low molar mass organosiloxane liquid-crystal molecules consist of a single mesogenic moiety attached via an alkyl chain to a short siloxane moiety. When the material is cooled from the isotropic phase, the siloxane moieties micro-separate from the mesogenic moieties and aggregate in planes that acts as an effective polymer backbone. The material is therefore in a smectic phase with alternating siloxane-rich layers and mesogen-rich layers. With a suitable design of the mesogenic moiety one can achieve a certain degree of decoupling between the mesogenic-rich layers. Such materials can be expected to display de Vries smectic A phases. In this paper we present monomesogen low molar mass organosiloxane liquid-crystal materials that display a wide temperature range de Vries smectic A* phase. The field dependence of the electric field-induced tilt of the optic axis and the field dependence of the birefringence have been measured at several temperatures. One of the materials displays a transition from de Vries smectic A* to smectic C* at low temperatures.
| Original language | English |
|---|---|
| Journal | Molecular Crystals and Liquid Crystals |
| Volume | 410 |
| DOIs | |
| Publication status | Published - 2004 |
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ASJC Scopus subject areas
- Condensed Matter Physics
Cite this
Electroclinic effect in low molar mass organosiloxane liquid crystals. / Carboni, C.; Mehdi, R.; George, A. K.; Al-Harthi, S. H.; Naciri, J.
In: Molecular Crystals and Liquid Crystals, Vol. 410, 2004.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Electroclinic effect in low molar mass organosiloxane liquid crystals
AU - Carboni, C.
AU - Mehdi, R.
AU - George, A. K.
AU - Al-Harthi, S. H.
AU - Naciri, J.
PY - 2004
Y1 - 2004
N2 - Monomesogen low molar mass organosiloxane liquid-crystal molecules consist of a single mesogenic moiety attached via an alkyl chain to a short siloxane moiety. When the material is cooled from the isotropic phase, the siloxane moieties micro-separate from the mesogenic moieties and aggregate in planes that acts as an effective polymer backbone. The material is therefore in a smectic phase with alternating siloxane-rich layers and mesogen-rich layers. With a suitable design of the mesogenic moiety one can achieve a certain degree of decoupling between the mesogenic-rich layers. Such materials can be expected to display de Vries smectic A phases. In this paper we present monomesogen low molar mass organosiloxane liquid-crystal materials that display a wide temperature range de Vries smectic A* phase. The field dependence of the electric field-induced tilt of the optic axis and the field dependence of the birefringence have been measured at several temperatures. One of the materials displays a transition from de Vries smectic A* to smectic C* at low temperatures.
AB - Monomesogen low molar mass organosiloxane liquid-crystal molecules consist of a single mesogenic moiety attached via an alkyl chain to a short siloxane moiety. When the material is cooled from the isotropic phase, the siloxane moieties micro-separate from the mesogenic moieties and aggregate in planes that acts as an effective polymer backbone. The material is therefore in a smectic phase with alternating siloxane-rich layers and mesogen-rich layers. With a suitable design of the mesogenic moiety one can achieve a certain degree of decoupling between the mesogenic-rich layers. Such materials can be expected to display de Vries smectic A phases. In this paper we present monomesogen low molar mass organosiloxane liquid-crystal materials that display a wide temperature range de Vries smectic A* phase. The field dependence of the electric field-induced tilt of the optic axis and the field dependence of the birefringence have been measured at several temperatures. One of the materials displays a transition from de Vries smectic A* to smectic C* at low temperatures.
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U2 - 10.1080/15421400490434937
DO - 10.1080/15421400490434937
M3 - Article
VL - 410
JO - Molecular Crystals and Liquid Crystals
JF - Molecular Crystals and Liquid Crystals
SN - 0026-8941
ER -