Friedel-Crafts Alkylation of o-xylene over V2O5 / ZrO2 Catalysts

The present study has undertaken the Friedel-Crafts benzylation of aromatics over the V2O5/ZrO2 catalysts systems. Catalysts with different V2O5 content (0-15wt %) was prepared by wet impregnation method and characterized by XRD, BET surface area, FTIR and 5’V NMR techniques. The surface acidic properties were determined by temperature programmed desorption of NH3, cumene cracking and perylene adsorption. Under the optimized reaction conditions, these catalysts are found to be very effective and considerably more selective than the conventional homogeneous Lewis acid catalysts. The investigation of vanadia systems-catalyzed benzylation of o-xylene with benzyl chloride revealed that the catalytic activity and product selectivity are sensitive to the precise reaction parameters and can be related to the Lewis acidity of the systems. The reaction is found to be very clean and produces the desired monoalkylated product with high yield

Development of hemp seed oil nanoemulsions loaded with ascorbyl palmitate : effect of operational parameters, emulsifiers, and wall materials

DATA AVAILABILITY : Data will be made available on request.The perceived health properties of hemp seed oil, as one of the few plant-based sources of omega-3 and omega-6 fatty acids with an ideal ratio of 1:3, suggest its incorporation in food-grade emulsions to improve its water solubility and oxidative stability. The current research's main aim was nanoemulsification of hemp seed oil using the oil-in-water emulsification method followed by ultrasonication. The entrapment efficiency of the nanoemulsions for antioxidant ascorbyl palmitate and its impact on oxidative stability of the oil was also evaluated. Gum arabic: maltodextrin in 75:25 ratio could result in nanoemulsion with entrapment efficiency of 97.10 % for ascorbyl palmitate and radical scavenging activity of oil-soluble bioactives of 92.13 %. Moreover, incorporation of ascorbyl palmitate could effectively retard the oxidation, specifically in nanoemulsions containing gum Arabic. The optimum formulation of nanoemulsion having an average droplet size of 293 nm can be applied as an ideal vegetarian source of omega-3 fatty acids.The DSI (Department of Science and Innovation) and NRF (National Research Foundation) Centre of Excellence in Food Security.http://www.elsevier.com/locate/foodchemhj2023Consumer ScienceFood ScienceSDG-02:Zero Hunge

Field Emission Characteristics of SnO

The SnO2/CNT composites were prepared by microwave-assisted wet impregnation at 60°C. The process was optimized by varying the microwave power and reaction time. Raman analysis showed the typical features of the rutile phase of as-synthesized SnO2 nanoparticles on CNTs, which was consistent with the results from X-ray diffraction. Enhanced field emission performance was observed for SnO2/CNTs composite prepared by a microwave method when compared to pure CNTs and SnO2/CNTs composite prepared by conventional wet impregnation. The dependence of emission current density on the electric field followed a Fowler-Nordheim relationship

Recent Trends in the Microwave-Assisted Synthesis of Metal Oxide Nanoparticles Supported on Carbon Nanotubes and Their Applications

The study of coating carbon nanotubes with metal/oxides nanoparticles is now becoming a promising and challenging area of research. To optimize the use of carbon nanotubes in various applications, it is necessary to attach functional groups or other nanostructures to their surface. The combination of the distinctive properties of carbon nanotubes and metal/oxides is expected to be applied in field emission displays, nanoelectronic devices, novel catalysts, and polymer or ceramic reinforcement. The synthesis of these composites is still largely based on conventional techniques, such as wet impregnation followed by chemical reduction of the metal nanoparticle precursors. These techniques based on thermal heating can be time consuming and often lack control of particle size and morphology. Hence, there is interest in microwave technology recently, where using microwaves represents an alternative way of power input into chemical reactions through dielectric heating. This paper covers the synthesis and applications of carbon-nanotube-coated metal/oxides nanoparticles prepared by a microwave-assisted method. The reviewed studies show that the microwave-assisted synthesis of the composites allows processes to be completed within a shorter reaction time with uniform and well-dispersed nanoparticle formation

Cannabidiol-mediated green synthesis, characterization, and cytotoxicity of metal nanoparticles in human keratinocyte cells

This study investigated a unique one-pot microwave- assisted green synthesis method of gold (Au) and silver (Ag) nanoparticles (NPs) using cannabidiol (CBD) as a capping and reducing agent. Furthermore, Au and Ag NPs were also chemically synthesized using poly(vinyl pyrrolidone), which functioned as reference materials when comparing the size, shape, and cytotoxicity of NPs. Synthesis parameters such as reaction time, temperature, and precursor molar ratio were optimized to control the size and shape of the biosynthesized NPs. Various characterization techniques such as transmission electron microscopy, ultraviolet−visible spectroscopy, Fourier transform infrared spectroscopy, and X-ray diffraction were used to confirm the formation and properties of Au and Ag NPs. Both biosynthesized metal NPs were spherical and monodispersed, with average particle sizes of 8.4 nm (Au-CBD) and 4.8 nm (Ag-CBD). This study also explored the potential cytotoxicity of CBD-capped NPs in human keratinocyte cells, which was observed to be of minimal concern. The novel synthesis approach presented in this study is free from harsh chemical reagents; therefore, these NPs can be used in a wide array of applications, including the pharmaceutical and biomedical fields.The Department of Science and Innovation and the Council for Scientific and Industrial Research.http://pubs.acs.org/journal/acsodfam2022PharmacologyPlant Production and Soil Scienc