Hydrogen Permeation in LaNi5 Film formed on silicone organic material.

Secondary organic material formed by methylglyoxal in aqueous aerosol mimics

We show that methylglyoxal forms lightabsorbing secondary organic material in aqueous ammonium sulfate and ammonium nitrate solutions mimicking tropospheric aerosol particles. The kinetics were characterized using UV-Vis spectrophotometry. The results suggest that the bimolecular reaction of methylglyoxal with an ammonium or hydronium ion is the rate-limiting step for the formation of light-abs...

More affordable electrolytic LaNi5-type hydrogen storage powders.

Compounding between NiO and La(2)O(3) protects the latter from water and molten salt attack, and ensures successful direct electrolytic conversion of the oxide precursors, in the solid state, to more affordable LaNi(5)-type hydrogen storage materials.

Tooth reduction guide using silicone registration material along with vacuum-formed thermoplastic matrix.

Adequate tooth reduction is a prerequisite for function, esthetics, and longevity of fixed restorations. A tooth reduction guide may be useful for establishing the proper angulation of the tooth and maximizing periodontal health and restorative success. This article describes a simple and versatile technique for an accurate evaluation of tooth reduction for fixed restorations by using a color-c...

Modeling hydrogen permeation through a thin titanium oxide film and palladium

CO adsorption on a LaNi5 hydrogen storage alloy surface: a theoretical investigation.

Density functional theory calculations are carried out to study CO adsorption on the (001) surface of a LaNi(5) hydrogen storage alloy. At low coverages, CO favors adsorption on Ni-Ni bridge sites. With an increase in CO coverage, the decrease in the adsorption energy is much larger for Ni-Ni-CO bridge adsorption than that for Ni-CO on-top adsorption. Thus, the latter sites in the relatively st...