Synthesis of an efficient lanthanide doped glass-ceramic based near-infrared photocatalyst by a completely waterless solid-state reaction method

A novel efficient near-infrared photocatalyst of glass-ceramic/TiO2 was synthesized by a completely waterless solid-state reaction method, with optically active center CaF2 in glass-ceramic powders and anatase-TiO2 as the superficial coating.

Impact on Surface Treatment of Hydrophobic Consolidation Terracotta Ornaments

During the consolidation and rehabilitation interventions of George RaduMelidon City Library Roman, Neamţ County, a series of architectural terracotta decorations, manufactured in the second half of the century XIX, have been identified and cataloged. The current state of these decorations, made from geomaterials, requires the establishment of a technical solution which will be used to preserve, to strengthen the color, the aesthetic surface and the chromatic reintegration. Thus, the paper presents the study of four current commercial chemicals products, part of the additives hydrophobic/waterproofing group. One of the products is a water based emulsion, while the other three are organic based solvents. This study was required in order to develop an optimal treatment to preserve the old terracotta from facade of building already mentioned. The technical features that these products have in common are sealing and waterproofing by superficial coating, with an average penetration and restoration of chromatic aspect, as close to the original. CIE L*a*b* colorimetry, optical microscopy and the measure of humidity (reversible water content and related chemical) were implemented in the study of optimization of pellicle dispersion systems based on the four chemicals.

The High Temperature Oxidation Resistance and Anti-Oxidation Mechanism of Plasma-Sprayed NiCrAlY Coatings on Stainless Stell

The coating was made of base coating (NiCrAlY) and superficial coating (ZrO2 + Y2O3) by plasma spray. The microstructure and phase structure of the coating were investigated by using the scanning electron microscope and the X-ray diffraction. The oxidation process can be divided into three stages: The main oxidation products is θ-Al2O3 but not continuous α-Al2O3 film in oxidation prophase; Continuous α-Al2O3 film generated quickly with the transition of θ-Al2O3 to α-Al2O3 in the oxidation reaction. The oxidation reaction becomes complicated when the content of Al decrease and Ni is also oxidized to NiO. Oxidation kinetics curves of 1200°C is basically accord with parabolic law.