Dexter D. Snyder

Combining electrolysis and dialysis for regeneration of chromic acid etching solution

Abstract The technique of integrating Donnan dialysis with electrolysis was evaluated for regenerating a chromic acid solution contaminated with copper. Electrolysis converts the reduced chromium (Cr 3+ ) to the active form (Cr 6+ , as dichromate), but cannot remove copper efficiently. A dialyzer in series greatly increases the copper removal efficiency by providing a facile route for copper ions to reach the catholyte where they are electrodeposited.

AC Impedance Spectroscopy (ACIS) Analysis of a Polymer Dispersed Liquid Crystal (PDLC) Film

Abstract AC impedance spectroscopy is applied to monitoring the chemical-physical condition of polymer dispersed liquid crystals (PDLC). The results define an approach for non-destructive evaluation as the PDLC is designed into informational displays. Response. functions are linked to electrical properties of the constituents through mixture relations. Resistivity is established as being much more sensitive than permittivity to the PDLC state. Consideration is given to treating explicitly the large interphasal region found surrounding each liquid crystal droplet in the continuous matrix.