Abstract

Abstract Shear flow in a liquid single crystal of the nematic type (MBBA) is studied. A homeotropic layer is enclosed by two circular glass plates, one of them rotating against the other. Between crossed polarizers one observes a system of concentric dark rings. The averaged optical anisotropy is found to be a pure function of the product of shear velocity and layer thickness. This agrees with the continuum theory of Leslie. The constants k 11/k 33, λ1/λ2, and (λ2 − λ2)/k 33 are determined.

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