Journal of Composites and Compounds
Volume:4 Issue: 13, Dec 2022

Herein, one-step oxidation-chemical polymerization in situ to prepare a composite of copper oxide nanoparticles doped with polyaniline(CuO@PANI) was investigated in order to check the electrochemical properties.The influence of the synthetic approach, the doping effectiveness of copper oxide nanoparticles, as well as the structure of the as-synthesized composite, were all studied. The synthesized compositewas characterized by field emission SEM and XFR. The results showed favorable interaction between PANI and CuO NPs. The electron microscopy analysis of the composite indicates that CuO is well dispersed and agglomerated in the PANI matrix as can be seen clearly in X-ray fluorescence analysis. Moreover, X-ray assessment indicated that the amount of CuO NPs strengthens the crystallinity of PANI. Moreover, to investigate the electrochemical performance of CuO@PANI, the composite was drop-casted on a glassy carbon electrode surface and its electrocatalytic activity was examined via a potentiostate in presence of catechol. As a result, the electrical conductivity of the synthesized hybrid was found to be drastically increased (around 60 %) as compared to that of pure PANI at room temperaturedue to the formation of conducting path between CuO and PANI surface. Hence, through this work we highly recommend to use this hybrid for future electrochemical sensing applications.

3,5-Bis(trifluoromethyl) phenyl ammonium triflate(BFPAT) catalyzed one-pot synthesis of indeno[1,2-b]pyridine compound derivatives by four-component condensation of aldehyde, aromatic ketones, 1,3-indanedione, and ammonium acetate in ethanol. Accessible starting materials, Simplicity of operation, green and practical catalyst, easy purification, and excellent yields are the key benefits of the current technique.

The advancement of residual fluid catalytic cracking (RFCC) is significantly influenced by the development of heavy metals passivation technology. Resids often include larger concentrations of heavy metals (Ni, V, and Fe) than gas oils, primarily in the form of porphyrin complexes and salts of organic acids. Under cracking conditions, metals, especially Ni and V in residues and gas oil deposit on the cracking catalyst and induce adverse dehydrogenation reactions. The catalyst's zeolite component is destroyed by these metals. While reducing the yield of gasoline, active metals increase the yields of coke and hydrogen. Because most cracking FCC units can only tolerate limited amounts of coke and hydrogen, the level of heavy metals on the catalyst needs to be kept under control in order to achieve maximum productivity and profit. Metal passivation enhances catalytic activity and/or selectivity to more desired products by minimizing the detrimental effects of contaminating metals. In this study, we will review heavy metals deactivation mechanism in RFCC process and the potential technological solutions to the catalyst deactivation concern.

Lightweight high-strength Ti-based metal matrix composites (Ti-based MMCs) have a multitude of application applications, e.g., biomedical engineering, aerospace, and automotive, due to their good sustainability, high specific strength/stiffness, high elevated temperature strength, high wear, and corrosion resistance. Although there are metal matrix composite coatings comprised of polymers, composite, and ceramics materials, the paper primarily focuses on titanium-based composite coatings. This review also discusses the different coating techniques including electrodeposition, thermal spray, plasma spray, vapor deposition, and laser cladding to achieve high hardness and roughness, wear resistance and corrosion resistance. Totally, we attempt to bring out Ti based materials scenario for its current applications.

Lightweight high-strength Ti-based metal matrix composites (Ti-based MMCs) have a multitude of application applications, e.g., biomedical engineering, aerospace, and automotive, due to their good sustainability, high specific strength/stiffness, high elevated temperature strength, high wear, and corrosion resistance. Although there are metal matrix composite coatings comprised of polymers, composite, and ceramics materials, the paper primarily focuses on titanium-based composite coatings. This review also discusses the different coating techniques including electrodeposition, thermal spray, plasma spray, vapor deposition, and laser cladding to achieve high hardness and roughness, wear resistance and corrosion resistance. Totally, we attempt to bring out Ti based materials scenario for its current applications.

Micro/nanomotors (MNMs) are very unique in performing tasks and performance according to their scale. These small and versatile motors are known as promising tools in various applications. The ultimate goal is the application of MNMs in various fields, which is considered an exciting technological challenge. Chemical fuel is reliable for the movement of MNMs. Among the various movement mechanisms that exist for these engines, bubble propulsion is one of the most important, and many engines have been investigated using this propulsion mechanism. Magnetic motors are another category of motors that move by applying a magnetic driving force and their direction of movement can be adjusted by the applied magnetic field. One of the most important challenges in the field of MNMs is the use of controlled and efficient engines, which requires the manufacturing and careful design of these engines. By incorporating of two engines, it is possible to benefit from the advantages of both, and at the same time, the limitations of each one are removed and the possibility of controlling the movement of the engine is provided. We will review the methods of manufacturing and characterizing MNMs which consume chemical fuel and move by bubble propulsion and also have magnetic properties and can propel by applying a magnetic field. These engines can reduce the common fuel used in chemical engines by applying magnetic driving force and switching their operation in response to changing conditions. Due to continuous innovations in this field, MNMs will profoundly impact the field of Nanorobotics.

Carbon-based materials. including carbon nanotubes, graphene, and activated carbon, are among the most effective materials for pharmaceutical components removal from water. Despite the severe effect of pharmaceutical micropollutants in the aquatic environments and the effectiveness of carbon-based composites for water treatment, only a few studies has reviewed carbon-based materials for the removal of pharmaceutical components. Carbon-based materials with special properties like tunable surface functions, abundant pore structure, and high specific surface are used in different water treatment mechanisms such as adsorption and advanced oxidation processes. Graphene, activated carbon, and carbon nanotubes have been widely studied for pharmaceutical components removal. Herein, we have introduced carbon-based materials and reviewed recent studies on their properties, application in water treatment, and possible mechanism for removal of pharmaceutical components from aquatic environments.