In the present contribution we introduce silver nanowires, a material with outstanding properties. When silver nanowires are coated on surfaces, they form a percolating network. The surface resistance of these coatings can be adapted to individual needs, by changing the amount of silver nanowires on the surface. The coating formulation is versatilely applicable on rigid and flexible, glass and plastic and even curved substrates. Silver nanowires can be processed using standard coating procedures.
Thereby the material properties of silver, such as excellent electrical conductivity and reflection of electromagnetic radiation, and the advantages of nanotechnology are combined: The resulting coatings are electrically conductive, show remarkable reflective properties to electromagnetic radiation in the infrared wavelength range and are transparent in the visible spectral range.
In this paper we will demonstrate the potential of silver nanowires as a reflective coating for electromagnetic radiation on the example of low-e coatings. Such low-e coatings can be used for e.g. windows, where a high reflection of incoming IRradiation is necessary to avoid rising of the interior’s temperature. The reflective properties of silver nanowire based lowe coatings can be individually adjusted by means of the maximum reflection performance within a specific wavelength interval. Furthermore, the reflection properties of silver nanowires show a wavelength dependent performance. Consequently, silver nanowires are a promising material for tailorable reflective coatings especially for electrical, optical and IR systems.
New grades of sintered (polycrystalline) corundum ceramics have been shown to exhibit a ballistic shielding power close to SiC/B4C composites when manufactured with a grain size of about 500 nm. It is demonstrated here that these Al2O3 ceramics become transparent when their residual porosity is decreased to less than 0.05 %. Specifically, in the IR range between about 2 and 6 μm their transmissivity equals that of sapphire approaching the upper theoretical limit for wavelengths of 2.5-4.5 μm. This opens the way to new possible applications such as IR domes. These optically and mechanically homogeneous ceramics can be manufactured with a wall thickness up to 15 mm by a wet casting approach. The technology enables the manufacture of complex hollow spheres which after sintering are transparent in visible light without polishing.
An electrochromic device using tungsten oxide as an electrochromic electrode, cerium- titanium oxide as an optically passive counter electrode, laminated by a polymer based ion conductor has been fabricated and characterized. The fabrication technology as well as the optical switching behavior and cyclability show that this device is a promising system for smart windows in automotive and building application.
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