Volume 73, Number 5, March 2006
|Page(s)||800 - 805|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||27 January 2006|
Viscosity measurement using a rotating laser-trapped microsphere of liquid crystal
CREST-JST and Research Institute for Electronic Science, Hokkaido University N21-W10, CRIS Bldg., Kita-ku, Sapporo 001-0021, Japan
Accepted: 10 January 2006
We demonstrate that the viscosity measurement by a spinning laser-trapped liquid-crystal microsphere depends on the surface tension and hydrophobicity of sphere's material. A reduction of the viscous drag was observed for the hydrophobic E44 liquid-crystal droplets even at low surface tension, while a reduced surface tension caused an increased drag in the case of 5CB microspheres. The importance of the non-slipping boundary condition and light propagation throughout the laser-trapped microsphere in the viscosity measurements by a spinning microsphere (Bishop A. I. et al. , Phys. Rev. Lett., 92 (2004) 198104) is discussed.
PACS: 83.85.Jn – Viscosity measurements / 83.85.Ei – Optical methods; rheo-optics / 42.70.Df – Optical materials: Liquid crystals
© EDP Sciences, 2006
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