A Method for Determination of Elastic Constants $K_{1}$, $K_{2}$, $K_{3}$ of a Nematic Liquid Crystal Only Using a Homogeneously Aligned Cell

概要

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It is shown that three Frank elastic constants $K_{1}$, $K_{2}$ and $K_{3}$ of a nematic liquid crystal can be determined by measuring the capacitance change with a magnetic field of a homogeneously aligned cell. The splay elastic constant $K_{1}$ is determined from the threshold magnetic field strength $H_{\text{c}1}$ when the magnetic field is applied normal to the cell. The bend elastic constant $K_{3}$ is determined from the slope of the linear dependence between the inverse of the capacitance 1/$C$ and the inverse of the magnetic field strength 1/$H$ in the high field region $H/H_{\text{c}1}{>}3$. The twist elastic constant $K_{2}$ is determined from the threshold field strength when the magnetic field is applied oblique to the cell normal but perpendicular to the initial director. In these procedures, principal dielectric constants $\varepsilon_{\varparallel}$, $\varepsilon_{\bot}$, dielectric anisotropy $\varDelta\varepsilon$, anisotropy of the magnetic susceptibility $\varDelta\chi$ can be determined simultaneously.
INSTITUTE OF PURE AND APPLIED PHYSICSの論文
1989-08-20