Nanocontainers for Self-Healing Coatings on Mild Steel

Mild steel is an important material in construction, automobile, and other engineering applications. Long exposure to a corrosive environment causes damage to the material and makes it less efficient for usage. Various methodologies such as barrier coatings and self-healing coatings are employed to prevent corrosion to occur. To increase the performance of the coatings, modifications are carried out by the addition of corrosion inhibitors into the coating matrix. Direct addition leads to unwanted reactions with the coating matrix and loss of corrosion inhibitor itself. In order to prevent this problem, nanocontainers are used to encapsulate the self-healing agent/corrosion inhibitor. Therefore, recent corrosion prevention methods involve the fabrication of multifunctional coatings using different nanocontainers such as halloysite nanotubes, polymeric microcapsules, layered double hydroxide, etc. loaded with corrosion inhibitors. The release of corrosion inhibitors works on trigger mechanism arising due to change in external stimuli and thus increasing the durability of the coatings

Electron transfer reactions at Nafion and clay adsorbed Ru (bpy)<SUP>2+</SUP><SUB>3</SUB> coated electrodes

The photoelectrochemical properties of Nafion and montmorillonite (MM) clay coated electrodes confining Ru (bpy)2+3 were studied in the presence of Fe3+ and HClO4. Pt/Nafion-Ru (bpy)2+3 and Pt/MM-Ru (bpy)2+3 electrodes exhibited different photoelectrochemical behavior depending on the coating material. While visible light irradiation at Pt/Nafion-Ru (bpy)2+3 electrode produced anodic photocurrent, Pt/MM-Ru(bpy)2+3 electrode produced cathodic photocurrent. A new photogalvanic cell was constructed using Pt/Nafion-Ru (bpy)2+3 as photoanode and Pt/MM-Ru(bpy)2+3 as photocathode. The irradiation of both the electrodes in the same cell showed additive photoresponse

Water oxidation catalysed by heterogeneous Schiff base manganese complex

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Photoinduced electron transfer reactions at methylene blue adsorbed nafion and clay coated electrodes

Nafion and montmorillonite clay adsorbed methylene blue coated onto platinum electrode were prepared. These dye modified electrodes were used as photoelectrodes in a photogalvanic cell in the presence of Fe2+ ions. The photoelectrochemical investigations showed that the dye coated electrodes behaved as cathode upon irradiation whereas the plain platinum electrode dipped in a homogeneous solution containing methylene blue and Fe2+ ions behaved as anode. It is suggested that the intermediate complex formed between the photoreduced methylene blue and ferric ion lead to the reductive reaction at the coated electrode

Identification of poisonous plants in the heart of public squares of ribeirão Preto SP

Toxic plants, many ornamentals, may be present in gardens, backyards, parks, vases, squares and vacant lots around the cities. Some of these plants are well known and exuberant, with strong color and decorative aspects, but when swallowed or handled, can cause severe intoxication specially in children. The main objective was to identify the poisonous plants found in public squares of Ribeirão Preto downtown, among five squares: XV de Novembro Square, Carlos Gomes Square, Bandeiras Square, Luís de Camões Square and Sete de Setembro Square. In this study, a literature review was performed in order to know the species that have been recorded as toxic plant. For the species in question, the common name and therapeutic indication were recorded. Over all evaluated squares toxic species were found. Sete de Setembro Square was the most frequent species in a total of seven toxical species. The most common species in the surveyed places were: Euphorbia pulcherrima, Buxus semprevirens and Dracaena fragrans, popularly known as Poinsettia, Boxwood and Cornstalk Dracaena, respectively. The importance of doing studies in urban squares is to improve care to ensure the afforestation process of the cities