Measurement of viscosity of lyotropic liquid crystals by means of rotating laser-trapped microparticles

Liu, Qingkun, Asavei, Theodor, Lee, Taewoo, Rubinsztein-Dunlop, Halina, He, Sailing and Smalyukh, Ivan I. (2011) Measurement of viscosity of lyotropic liquid crystals by means of rotating laser-trapped microparticles. Optics Express, 19 25: 25134-25143. doi:10.1364/OE.19.025134


Author Liu, Qingkun
Asavei, Theodor
Lee, Taewoo
Rubinsztein-Dunlop, Halina
He, Sailing
Smalyukh, Ivan I.
Title Measurement of viscosity of lyotropic liquid crystals by means of rotating laser-trapped microparticles
Journal name Optics Express   Check publisher's open access policy
ISSN 1094-4087
Publication date 2011-12
Sub-type Article (original research)
DOI 10.1364/OE.19.025134
Open Access Status DOI
Volume 19
Issue 25
Start page 25134
End page 25143
Total pages 10
Place of publication Washington, DC, United States
Publisher Optical Society of America
Collection year 2012
Language eng
Abstract We describe a simple microrheology method to measure the viscosity coefficients of lyotropic liquid crystals. This approach is based on the use of a rotating laser-trapped optically anisotropic microsphere. In aligned liquid crystals that have negligible effect on trapping beam’s polarization, the optical torque is transferred from circularly polarized laser trapping beam to the optically anisotropic microparticle and creates the shear flow in the liquid crystalline fluid. The balance of optical and viscous torques yields the local effective viscosity coefficients of the studied lyotropic systems in cholesteric and lamellar phases. This simple yet powerful method is capable of probing viscosity of complex anisotropic fluids for small amounts of sample and even in the presence of defects that obstruct the use of conventional rheology techniques.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
 
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