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2004•Molecular Crystals and Liquid CrystalsRequires access

A Novel Method for the Measurement of the Nematic Liquid Crystal Twist Elastic Constant

J. F. Strömer, C. V. Brown, E. P. Raynes

Open publisher page 5 citations

Abstract

A novel technique has recently been developed for the determination of the twist elastic constant K22 in nematic liquid crystals. The method is based on the measurement of the threshold voltages of the unwound and π-twisted regions in a wedge cell geometry. It has the advantage that the chiral nematic pitch and the cell spacing do not need to be accurately known. In this paper the value of K22 is determined using this method for the material MLC6424. This is compared with the value derived from measurements in the conventional twist geometry in a cell with uniform spacing.

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What this paper is about

A novel technique has recently been developed for the determination of the twist elastic constant K22 in nematic liquid crystals. The method is based on the measurement of the threshold voltages of the unwound and π-twisted regions in a wedge cell geometry. It has the advantage that the chiral nematic pitch and the cell spacing do not need to be accurately known. In this paper the value of K22 is determined using this method for the material MLC6424. This is compared with the value derived from measurements in the conventional twist geometry in a cell with uniform spacing.

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Available abstract

A novel technique has recently been developed for the determination of the twist elastic constant K22 in nematic liquid crystals. The method is based on the measurement of the threshold voltages of the unwound and π-twisted regions in a wedge cell geometry. It has the advantage that the chiral nematic pitch and the cell spacing do not need to be accurately known. In this paper the value of K22 is determined using this method for the material MLC6424. This is compared with the value derived from measurements in the conventional twist geometry in a cell with uniform spacing.

Key concepts: Liquid crystal, Twist, Materials science, Constant (computer programming), Wedge (geometry), Biaxial nematic, Optics, Condensed matter physics

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