One step nanoencapsulation of corrosion inhibitors for gradual release application |
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Authors: | A Privitera L Ruggiero I Venditti U Pasqual Laverdura S Tuti D De Felicis S Lo Mastro L Duranti E Di Bartolomeo T Gasperi MA Ricci A Sodo |
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Institution: | 1. Department of Science, University of Rome Tre, Via Della Vasca Navale 84, 00146, Rome, Italy;2. Department of Science, University of Rome Tre, Via Della Vasca Navale 79, 00146, Rome, Italy;3. LIME - Interdepartmental Electron Microscopy Lab, Department of Engineering, University of Rome Tre, Via Della Vasca Navale 79, 00146, Rome, Italy;4. Department of Chemical Science and Technologies, University of Rome Tor Vergata, Via Della Ricerca Scientifica, 00133, Rome, Italy |
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Abstract: | The direct application of corrosion inhibitors on metal surfaces is potentially dangerous for the environment and the restoration operators, thus new conservation strategies are mandatory. In this study, two copper corrosion inhibitors, 1H-benzotriazole (BTA) and 5-phenyl-1H-tetrazole (PT), are encapsulated in a silica nanocontainer, for future application in smart coatings, with the aim to reduce the amount of chemicals used in treatments, their dispersion in the environment and the direct exposure of the operators to these chemicals. In particular, composite silica nanocapsules, containing the corrosion inhibitors, are prepared via one-step synthesis, based on mini-emulsion polymerisation processes.The morphology, structure, and texture of these loaded silica nanocontainers are characterised by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N2 physisorption (BET/BJH). Micro-Raman spectroscopy (RS) is performed to characterise the composition. UV–visible spectroscopy and thermal analysis (TG/DSC) are performed for the loading and encapsulation efficiency (L%, EE%) study.Synthesised nanocapsules show a core-shell structure and, when loaded with the inhibitors, have size ranging from about 130 to 170 nm and a BET surface area of the order of 800 m2/g. The EE% is maximum in the case of BTA and decreases to ~52% in the case of PT. |
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Keywords: | Composite silica nanocapsules One-step synthesis Copper corrosion inhibitors Eco-sustainable release systems 1H-benzotriazole 5-phenyl-1H-tetrazole |
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