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Fascinating Physical Properties of Multi-functional Materials: A Review
A.S. Abdel-Rahman

In this review, some physical properties of organic-inorganic perovskites, elastomer blends and glass are discussed; the mechanical behavior, optical bandgap, vibrational spectroscopy and nanostructure of these materials are investigated. The study of the mechanical properties of elastomer blends uses the pulse excitation technique as it is non-contact, easy used and not affecting the sample, reliable, low cost, accurate and suiting a wide variety of rubbery materials and elastomers. The internal friction coefficient is obtained by mathematical analysis and shows as the concentration of N774 black increases the internal friction increases until 90 phr, followed by a sharp increase. This may be due to the enhancement of the aggregations formations, less occlude rubber, the active friction forces in the deagglomeration – agglomeration of the filler vanishing and the special characteristic of N774 black (large particle size and low tendency to form aggregations). The study of the optical bandgap of perovskites and glasses by Schuster–Kubelka–Munk (SKM) remission function is achieved. The studied samples of perovskites show a strong absorption at the UV–Vis light region, so this behavior may find attractive applications as visible light photocatalysis. While these study on ZnO doped phosphate glass system show optical energy gap decrease from 3.68 eV to 3.25 eV with the increasing ZnO content. This can be related to the gradual increase in number of non-bridging oxygen (NBO) atoms. Vibrational spectroscopy is an efficient method to assign the IR/Raman peaks to their modes in the molecule or a part of it. The partial symmetry and Omega-table enhance the group theory character table and correct the meaning of complex quantities in it. The study of nanostructure by X-ray diffraction patterns is useful to determine the crystalline size. More deep theoretical approaches refine the obtained size and show the micro-strain inside the nanoparticle.

Keywords: Perovskite, Elastomer, Glass, Mechanical, Optical bandgap, Vibrational spectroscopy, Nanostructure