Abstract: Molybdenum trioxide (MoO3) is a transition metal oxide with a wide band gap. It is an n-type semiconductor material with an oxygen deficiency. MoO3 used as a sensing element for many of the reducing and oxidizing gases and proved to be a promising candidate for the same. Many literatures are available in this context; out of which some are explained in this article. This discussion covers the gas sensing response of different type of nanostructures of molybdenum trioxide and selectivity of particular structure toward the gas being sensed. It also includes the graphical representation of the variation of sensitivity/sensor response with the concentration of test gas. Lastly conclusions have been made on the basis of the discussion given in the following sections.
Keywords: Sensing mechanism, Gas sensing response of Molybdenum trioxide, MoO3 Nanostructures
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Abstract: In the context of the wide demand of high quality of bitumen, this research was initiated with the objective of enhancing the asphalt mix properties. Variable additives percentages of nanomaterial and polymer material were investigated, experimentally, in order to determine their effect on asphalt properties. Three nano materials (i.e. nano-silica, nano0kaolinite and nano-montmorlinit) and three polymer materials were considered (i.e. SBS, polypropylene, and polyethylene). Modified specimens (with 1, 3, 5, 7, and 9% of nano and polymer material) were prepared. Rheological properties tests were conducted (i.e. penetration, softening, flash point and viscosity). In addition, mechanical properties tests were carried out (i.e. Marshall, compression, and indirect tensile tests). Results were obtained and analyzed. They indicted that additives enhanced rheological and mechanical properties of asphalt mix.
Keywords: Hot Asphalt Mix; Polymerized-Materials
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Abstract: The inhibition effect of synthesized schiff base on the corrosion of carbon steel in (0.5 M HCl and 0.5 M H2SO4) was studied at different temperatures (25–55 ºC) by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods. The carbon steel surface morphology was investigated by SEM. The obtained results showed that the prepared schiff base is excellent inhibitor in (0.5 M HCl and 0.5 M H2SO4) and the inhibition efficiency (η) increases with the inhibitor concentration, but it decreases with increasing temperature. The adsorption of inhibitor on the surface of carbon steel is mixed chemical and physical adsorption and found to obey the Langmuir adsorption isotherm equation. Thermodynamic parameters have been obtained by adsorption theory. Polarization curves showed that the synthesized inhibitor is mixed-type inhibitor in both hydrochloric acid and sulfuric acid. Data obtained from electrochemical impedance spectroscopy (EIS) studies were analyzed to model-inhibition process through appropriate equivalent circuit model. Potentiodynamic polarization studies have been shown that the inhibitor acts as a mixed type of inhibitor. Scanning electron microscope (SEM) confirmed the protection of the carbon steel surface by the inhibitor.
Keywords: (0.5 M HCl and 0.5 M H2SO4), (EIS), SEM., (25–55 ºC), (η), (EIS), Potentiodynamic, hydrochloric
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