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Electrorotation of colloidal particles in liquid crystals | G Liao
; I I Smalyukh
; J R Kelly
; O D Lavrentovich
; A Jákli
; | Date: |
31 Aug 2005 | Journal: | Phys Rev E, 72 (3 Pt 1), 031704 | Abstract: | We present the first observations of dc electric-field-induced rotational motion of finite particles in liquid crystals. We show that the electrorotation is essentially identical to the well-known Quincke rotation, which in liquid crystals triggers an additional translational motion at higher fields. In the smectic phase the translational motion is confined to the two-dimensional geometry of smectic layers, in contrast to the isotropic and nematic phases, where the particles can move in all three dimensions. We demonstrate that by a proper analysis of the electrorotation, one can determine the in-plane viscosity of smectic liquid crystals. This method needs only a small amount of material, does not require uniform alignment over large areas, and enables probing rheological properties locally. | Source: | PubMed, pmid16241457 | Services: | Forum | Review | Favorites |
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