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High frequency effective viscosities of nematic liquid crystals with tilted orientation

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Domack,  A.
MPI for Polymer Research, Max Planck Society;

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Johannsmann,  Diethelm
MPI for Polymer Research, Max Planck Society;

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Domack, A., & Johannsmann, D. (2002). High frequency effective viscosities of nematic liquid crystals with tilted orientation. Applied Physics Letters, 80(25), 4750-4752.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-65BA-D
Abstract
Using quartz crystal resonators, we have measured the effective viscosities of nematic liquid crystals (LCs) in the MHz domain. The LC orientation was switched via the command-surface effect. The dependence of viscosity on orientation cannot be explained by orientational modes. They are attributed to the emission of longitudinal sound, the latter effect requiring a tilt orientation of the nematic director with respect to the surface. Optical investigations confirm the existence of a finite pretilt angle. Sensor applications are discussed. (C) 2002 American Institute of Physics.