Nanoindentation was performed on Ti-B-Si-C and SiCN films deposited on Si substrates at varying loads and depths of penetrations. The intensity of chipping got enhanced with an increasing load which was represented geometrically. The pop-in and pop-out events occurring in the load and unloading were explained as cracking and high-pressure phase transformation. The interfacial fracture stability and adhesion of the film-substrate system, crucial for N/MEMS devices were analyzed with respect to frictional coefficient with the help of Finite Element Modelling (FEM).
Because of its dimensional stability, minimal shrinkage, chemical and fire resistance, good mechanical qualities and high resistance to a variety of solvents, acids and water, bismaleimide (BMI) thermosetting polymers are mostly employed in aerospace applications. Corrosion prevention has also been accomplished using BMI coating. The addition of inorganic materials like metal oxides can influence the properties of BMI as an inorganic–organic composite. Ferric chloride–bismaleimide (FeCl3–BMI) and titania–bismaleimide (TiO2–BMI) composites were synthesized. Fillers of inorganic compounds like MnO2, Ni (NO3)2·6H2O and Al2(SO4)3 were synthesized as well. The structural and crystalline configuration as well as physicochemical changes were thoroughly studied by XRD and Fourier transform infrared spectroscopy (FTIR).
ZnO was synthesised by the sol–gel method using zinc nitrate as the precursor. ZnO was doped with Al. Stress in the lattice was evident from the XRD peak shifts. A higher concentration of Al+3 showed a reverse strain effect also causing a reverse effect in the optical properties. An increase in crystallite size due to increased Al+3 was observed. A variation in absorption intensity based on the defect energy levels was observed. A difference in energy of the emission and absorption spectra resulting from defects in the material and non-radiative decay was seen. A change in the band gap was observed with changes in different dopant concentrations. These findings are useful for photocatalytic as well as antibacterial and anticancer treatments.
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