Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals

W. K. Robinson, C. Carboni, P. Kloess, S. P. Perkins, H. J. Coles

Research output: Contribution to journalArticle

90 Citations (Scopus)

Abstract

The present paper is a study of the ferroelectric and antiferroelectric behaviour in low molar mass organosiloxane liquid crystal materials classed as mono-mesogens (AB type) and bi-mesogens (ABA type). A systematic study of series of materials all based on the same chiral mesogenic moiety is presented. The mesogen is a biphenylyl benzoate with a halogen X attached laterally to the benzoate ring which is closest to the chiral centre. Three homologous series, where the halogen is either fluorine, chlorine or bromine, are investigated. The number of silicon atoms in the linkage or end group is varied between two and nine. It is found that the materials have a broad (∼40°C) ferroelectric or antiferroelectric phase with a high Ps (∼90nCcm-2). The siloxane moiety forces the tilt angle to a temperature independent value close to 45°. The antiferroelectric order is observed only in bi-mesogens with an odd number of silicon atoms in the siloxane link. The antiferroelectric order is attributed to the conformation of the molecule rather than to antiferroelectric interactions between layers.

Original languageEnglish
Pages (from-to)301-307
Number of pages7
JournalLiquid Crystals
Volume25
Issue number3
Publication statusPublished - Sep 1998

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Liquid Crystals
Molar mass
siloxanes
halogens
Liquid crystals
Siloxanes
Ferroelectric materials
Halogens
Benzoates
liquid crystals
Silicon
silicon
bromine
linkages
chlorine
fluorine
atoms
Bromine
Atoms
Fluorine

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Robinson, W. K., Carboni, C., Kloess, P., Perkins, S. P., & Coles, H. J. (1998). Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals. Liquid Crystals, 25(3), 301-307.

Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals. / Robinson, W. K.; Carboni, C.; Kloess, P.; Perkins, S. P.; Coles, H. J.

In: Liquid Crystals, Vol. 25, No. 3, 09.1998, p. 301-307.

Research output: Contribution to journalArticle

Robinson, WK, Carboni, C, Kloess, P, Perkins, SP & Coles, HJ 1998, 'Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals', Liquid Crystals, vol. 25, no. 3, pp. 301-307.
Robinson WK, Carboni C, Kloess P, Perkins SP, Coles HJ. Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals. Liquid Crystals. 1998 Sep;25(3):301-307.
Robinson, W. K. ; Carboni, C. ; Kloess, P. ; Perkins, S. P. ; Coles, H. J. / Ferroelectric and antiferroelectric low molar mass organosiloxane liquid crystals. In: Liquid Crystals. 1998 ; Vol. 25, No. 3. pp. 301-307.
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