Synergistic effects optical properties

By alternating layers of hard and soft materials, such as polystyrene and polypropylene, it is possible to achieve synergistic effects in properties, similar to polyblending. For example, a better combination of stiffness, ductility, and toughness can be obtained in polystyrene-polypropylene multilayer films than in either component alone. Such materials also display unusual optical behavior, such as total reflection, at certain wavelengths (Alfrey et al., 1969), because the films tend to reflect light in a manlier similar to the reflection of x-rays by crystals. 

Well-defined flower-like CdS nanostructures have been synthesized by Tai and Guo (2008) under ultrasound and microwave irradiations, simultaneously. Hexagonal nanopyramids and/or nanoplates were obtained depending on different sulfur sources. The synergistic effect of microwave and sonochemistiy has been proposed for the formation of these nanoflowers. They show a large bine-shift npto 100 nm as compared to simple low-dimensional CdS nanostmctnres. This stmctnre induced shift in optical properties, which may find some potential applications in optoelectronics devices, catalysis, and solar cells. 

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