| Issue |
Europhys. Lett.
Volume 73, Number 5, March 2006
|
|
|---|---|---|
| Page(s) | 800 - 805 | |
| Section | Interdisciplinary physics and related areas of science and technology | |
| DOI | https://doi.org/10.1209/epl/i2005-10457-7 | |
| 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
Corresponding authors: Saulius@es.hokudai.ac.jp Misawa@es.hokudai.ac.jp
Received:
1
November
2005
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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