Correlation Between the Fiber Texture of Nickel Electrodeposits as Supports and the Reflected Light Band from Cholesteric Liquid Crystals

Abstract

In previous works [Mol. Cryst. Liq. Cryst., 61, 31(1980); 95, 323 (1983)] the influence of the solid support sorptive properties on the color (reflected light band) of cholesteric liquid crystals was revealed. Qualitative and quantitative (visible diffuse reflectance spectroscopy) measurements at several temperatures on bare metal (Zn, Fe, Cu, Al) surfaces mechanically treated, on chemically and electrolytically prepared ZnO and Fe₃O₄, on electrolytically prepared γ₁,-and γ₂-Al₂O₃, on copper surfaces electroplated with copper and on electrolytically prepared γ₂-Al₂O₃ under several current densities, covered with a cholesteric mixture were carried out and correlated with the sorptive properties of the support. In the present work similar optical measurements at several temperatures with the same mixture of cholesterics as the one of the previous works on nickel electrodeposits with different fiber texture were carried out, compared each other and correlated with the deduced sorptive abilities of the deposits.