Graphene nanosheet reinforcement of polyurethane nanocomposite for green and sustainable photoluminescence,superhydrophobic, and anticorrosive paint

A simple and environmentally friendly method was developed for smart and efficient waterborne polyurethane (PUR) paint. Sugarcane bagasse was recycled into reduced graphene oxide nanosheets (rGONSs). Both lanthanide-doped aluminate nanoparticles (LAN; photoluminescent agent, 7–9 nm) and rGONSs (reinforcement agent) were integrated into a waterborne polyurethane to produce a novel photoluminescent, hydrophobic, and anticorrosive nanocomposite coating. Using ferrocene-based oxidation under masked circumstances, graphene oxide nanosheets were produced from sugarcane bagasse. The oxidized semicarbazide (SCB) nanostructures were integrated into polyurethane coatings as a drying, anticorrosion, and crosslinking agent. Polyurethane coatings with varying amounts of phosphor pigment were prepared and subsequently applied to mild steel. The produced paints (LAN/rGONSs@PUR) were tested for their hydrophobicity, hardness, and scratch resistance. Commission Internationale de l'éclairage (CIE) Laboratory parameters and photoluminescence analysis established the opacity and colourimetric properties of the nanocomposite coatings. When excited at 365 nm, the luminescent transparent paints emitted a strong greenish light at 517 nm. The anticorrosion characteristics of the coated steel were investigated. The phosphor-containing (11% w/w) polyurethane coatings displayed the most pronounced anticorrosion capability and long-persistent luminosity. The prepared waterborne polyurethane paints were very photostable and durable.     

Optical and Photocatalytic Measurements of Co-TiO2 Nanoparticle Thin Films

Plasmonics - Co-TiO2 nanoparticle thin films were synthesized by sol-gel method. The structural properties of the synthesized sample were studied using FTIR, XRD, and TEM. XRD confirmed the...     

Design and Synthesis of Pyridine and Thiazole Derivatives as Eco-friendly Insecticidal to Control Olive Pests

Treatment of p-tosyloxybenzaldehyde ( 1 ) with ethyl cyanoacetate afforded ethyl 2-cyano-3-(4-{[(4-methylphenyl)sulfonyl]oxy}phenyl)acrylate ( 2 ) which reacted with some active methylene derivatives under microwave irradiation in presence of ammonium acetate yielded pyridine derivatives 3 – 7 . On the other hand, when treatment of compound 1 with thiosemicarbazide gave 4-tosyloxybenzylidenethiosemicarbazone ( 8 ), which allowed to react with some active methylene compounds, such as: ethyl bromoacetate, chloroacetonitrile or phenacyl bromide derivatives gave thiazole derivatives 9 – 13 . The structure of all products were confirmed by elemental and spectroscopic analyses such as IR, ¹H-NMR, ¹³CNMR and mass spectra. The advanced of this method are short reaction time (3–7 min), excellent yield, pure products, and low-cost processing. In the final category, the toxicological characteristics of all compounds were tested towards Saissetia oleae (Olivier, 1791) (Hemiptera: Coccidae). With respect to the LC₅₀ values. It has been found that compound 3 possesses the highest insecticidal bioefficacy compared with other products, with values of 0.502 and 1.009 ppm, for nymphs and adults female, respectively. This study paves the way towards discovering new materials for potential use as insecticidal active agents.