Click chemistry on surfaces: 1,3-dipolar cycloaddition reactions of azide-terminated monolayers on silica

Article Abstract:

The preparation of monolayers of 11-azido-undecylisiloxane on powdered silica and on silicon wafers by the substitution of 11-bromo-undecylisiloxane and were subsequently coupled with three substituted acetylenes to yield 1,2,3 triazoles via the Huisgen 1,3-dipolar cycloaddition reaction is shown. A test was also conducted to examine the reactions for their suitability to modify and functionalize solid-state surfaces.

Analysis, Solid state chemistry, Semiconductor preparation

Dissolution kinetics of synthetic amorphous silica in biological-like media and its theoretical description

Article Abstract:

Dissolution behaviour and kinetics of different types of synthetic amorphous silica are studied with high specific surface areas in the system with biological-like conditions in TRIS buffer and the phospholipid L-alpha-dipalmitoylphosphatidylcholine (DPPC). The dissolution of nondisperse silica represents a strong size effect that leads to a significant higher silica concentration when compared with the bulk phase.

Amorphous substances, Amorphous materials, Choline

Mechanism of the optical response of mesoporous silica impregnated with Reichardt's dye to NH3 and other gases

Article Abstract:

Reichardt's dye (RD) on a highly hydrated HMS surface strips a proton from a SiOH in a patch of silanols, in the presence of polar molecules acting as solvents, so becoming colorless. A base stronger than RD captures the proton, giving rise to the appearance of color.

Nitrogenous Fertilizer Manufacturing, Nitrogenous fertilizers, Ammonia, Protons, Atomic properties