HRTEM observation of the monoclinic-to-tetragonal m-t) phase transition in nanocrystalline ZrO2

The orientation relations m(100) || t(001), m[001] || t[110]; m(011) || t(100), m[100] || t[001]; m(100) || t(110), m[001] || t[001]; m(013) || t(116), m[001] || t[001] (indices for the primitive tetragonal cell) have been found between the tetragonal (t) and monoclinic (m) domains during the electron irradiation-induced m-t phase transition observed in-situ with HREM within isolated zirconia nanoparticles. Geometric models of the m-t interfaces are proposed.     

Electrophoretic deposition of monochrome and color phosphor screens for information displays

This paper reviews our research on the electrophoretic deposition (EPD) of phosphors for the processing of monochromatic and color screens for information displays. Our investigation began with the study of the fundamentals of the EPD process for phosphors. The processing variables which enhance the adhesion strength of phosphor deposits were determined. The optical performance of phosphors deposited by EPD was shown to be not affected by the process itself nor by the conditions which enhance phosphor adhesion. Processes developed to produce high-resolution color screens by combining EPD and photolithography techniques are described. Also, a method to electrophoretically deposit phosphor in a thermo-reversible gel from mixtures of poly(butyl methacrylate) and isopropanol was examined.     

Effect of anions on the textural and catalytic activity of titania-silica mixed oxide

An attempt has been made to review and study the effect of anions (phosphate, sulfate and fluoride) on titania-silica samples. A comparative study has been made on structural characteristics and physico-chemical properties between the unmodified and anion modified titania-silica mixed oxides. The stabilisations of phase, porosity and sulphate ion at higher activation temperatures are discussed. The increase and decrease of specific surface area, acid strength and surface acid sites with respect to anions are emphasised. The effect of preparation method and conditions with specific surface area, porosity and surface acid sites are also discussed. The generation of new catalytic active sites and effect of porosity are reported towards esterification of acetic acid and mono-nitration of toluene, respectively.