Papers by Author: Jan B. Talbot

Abstract: Cobalt ferrite nanoparticles were deposited using electrophoretic deposition from two different bath chemistries, 90 vol.% water and 10 vol.% isopropanol with hexadecyltrimethlyammonium bromide (CTAB) and 100 % ethanol. The deposits were tested for electrocatalytic activity for the oxidation of ammonium sulfite to ammonium sulfate as part of a solar sulfur ammonia thermochemical cycle to produce hydrogen.

Abstract: Electrophoretic deposition (EPD) has been used for phosphor screening for a variety of emissive information displays and more recently, for solid state lighting. EPD is well suited to deposit the fine (nanometer to micrometer diameter) phosphor particles needed for high resolution displays. The fundamentals of the EPD process in an isopropanol (IPA) bath have been characterized by the dissociation behavior of nitrate salts in IPA, measurement of the effects of pH and nitrate salt concentration on the zeta potential of the particles, studying of the processing conditions and modeling of the deposition rates. The electrochemical precipitation reactions form an adhesive agent for the particles and the adhesion strength can be enhanced by various methods to meet the requirements of these technologies.

Abstract: Electrophoretic deposition was investigated as a procedure for preparing supported membranes of zeolite 5A for use in gas separations. In particular, the addition of polyethylene imine (PEI) to the non-aqueous bath was explored as means of improving gas separation selectivity, deposit morphology, and adhesion. It was found that the addition of PEI improved all of these qualities. Post-deposition treatments such as baking and coating with polystyrene were also studied.