Abstract
The motion of suspended particles in a nematic liquid crystal MBBA has been observed and measured under an optical microscope and using an automatic image processing system. In the nematic phase the motion of the suspended particles seems to be “frozen”, but in the isotropic state the Brownian motion of the particles can be clearly observed and satisfies Einstein's formula. The experiment implies that the “freeze” phenomenon may be associated with the local directional order of molecules in the nematic phase.
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