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Siloxane antiferroelectric liquid crystalline dimer exhibiting two field-free zero birefringent states.

Nils Olsson ; Ingolf Dahl ; Bertil Helgee (Institutionen för material- och ytkemi, Polymerteknologi ; Institutionen för fysik (GU)) ; Lachezar Komitov
Liquid Crystals (0267-8292). Vol. 31 (2004), 12, p. 1555-1568.
[Artikel, refereegranskad vetenskaplig]

We studied the optical and electro-optical properties of a siloxane antiferroelectric liquid crystalline dimer exhibiting a large molecular tilt that reached a maximum value of 53°. When the molecular tilt angle in the antiferroelectric phase exceeded 45°, it was found that the field-free position of the slow vibration direction, which corresponds to the largest refractive index, flipped from a position along the smectic layer normal, to a position perpendicular to it. When the tilt angle became 45°, a zero birefringent state, which was theoretically predicted by de Meyere in 1996, was also found to occur twice in the antiferroelectric phase of the siloxane dimer.

Nyckelord: siloxane, antiferroelectric, liquid crystalline, dimer, tilt, polarization



Denna post skapades 2007-10-05. Senast ändrad 2013-06-19.
CPL Pubid: 51655

 

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Institutioner (Chalmers)

Institutionen för fysik (GU) (GU)
Institutionen för material- och ytkemi, Polymerteknologi (2002-2004)

Ämnesområden

Optisk fysik
Mesoskopisk fysik
Fysikalisk kemi
Oorganisk kemi
Organisk syntes
Fotonik
Materialfysik med ytfysik

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