Protection of silver mirror stacks from environmental degradation before launching is crucial for space applications. Hereby, we report a comparative study the advanced protection telescopes provided by SiO2 and Al2O3 coatings in conditions accelerated aging sulfidation. The model stack samples were deposited cathodic magnetron sputtering on reference silica substrate optical applications surfa...

Abstract Developing delicate methods to synthesize well-controlled nanostructures is diffusely recognized as a potent tool enhance photocatalysts’ performances in various photoreactions. Herein, phase-controlled CdS hierarchical were synthesized using MOF-templated strategy, where Co-MOF nanospheres used the starting material, followed by two steps of sulfidation and cation exchange. By rationa...

Tungsten disulfide polycrystalline microfibers were successfully synthesized by a process involving electrospinning, calcination, and sulfidation steps. We used an aqueous solution of silicotungstic acid (H4SiW12O40) polyvinyl alcohol as precursors for the synthesis composite fibers needle-less electrospinning technique. The obtained green (av. diam. 460 nm) converted calcination in air to tung...

The stable-isotope geochemistry of sulfate minerals that form principally in I-type igneous rocks and in the various related hydrothermal systems that develop from their magmas and evolved fluids is reviewed with respect to the degree of approach to isotope equilibrium between minerals and their parental aqueous species. Examples illustrate classical stable-isotope systematics and principles of...