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Measurement of viscosity of lyotropic liquid crystals by means of rotating laser-trapped microparticles
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2011 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 19, no 25, 25134-25143 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2011. Vol. 19, no 25, 25134-25143 p.
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
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URN: urn:nbn:se:kth:diva-55236ISI: 000297702400028Scopus ID: 2-s2.0-82955226191OAI: oai:DiVA.org:kth-55236DiVA: diva2:474442
Note
QC 20120109Available from: 2012-01-09 Created: 2012-01-02 Last updated: 2017-12-08Bibliographically approved

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He, Sailing

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