Effect of electric field on the rheology of ferroelectric liquid crystal MORA-8

✍ Scribed by Shigeru Fukayama; Keishi Negita

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 494 KB
• Volume: 90
• Category: Article
• ISSN: 0167-7322
• DOI: 10.1016/s0167-7322(01)00115-5

✦ Synopsis

Effects of electric field on the rheology, electrorheological' effects, are investigated on ferroelectric smectic C+ phase of 4-(6-methyl)octyl-resorcylidene-4?9ctyla

(MOKA-8). When an electric field is applied in smectic C+ phase, an incmaseoftheshearstressis observed with its behavior depending on the shear rates; at higher shear rates the shear stress increases monotonously with the electric field strex& but at lower shear rates the shear stress &eases monotonously until about 2 kV mm-r, but above this field it discontinuously decreases to lower values, which is followed by an incmase at higher electric fields. In close vicinity of the smectic C+ to isotropic phase transition point, a field induced decrease of the shearstressisobserved.

TheseERbehaviorsarediscussedon~~ofthefieldinduoed orientational changes of the smectic layer and the director and a possible field induced structuralchange.