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  • 1.
    Landström, Anton
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Leccese, Silvia
    Laboratoire de Réactivité de Surface UMR CNRS 7197, Sorbonne Université, 4 Place Jussieu, F-75005, Paris, France.
    Abadian, Hagop
    Laboratoire de Réactivité de Surface UMR CNRS 7197, Sorbonne Université, 4 Place Jussieu, F-75005, Paris, France.
    Lambert, Jean-François
    Laboratoire de Réactivité de Surface UMR CNRS 7197, Sorbonne Université, 4 Place Jussieu, F-75005, Paris, France.
    Concina, Isabella
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
    Protti, Stefano
    PhotoGreen Lab, Department of Chemistry, University of Pavia, Viale Taramelli 10, I-27100, Pavia, Italy.
    Seitsonen, Ari Paavo
    Département de Chimie, Ecole Normale Supérieure, 24 Rue Lhomond, F-75005, Paris, France; Paris Sciences et Lettres Université, Sorbonne Université et Centre National Du Recherche Scientifique (CNRS), F-75005, Paris, France.
    Mezzetti, Alberto
    Laboratoire de Réactivité de Surface UMR CNRS 7197, Sorbonne Université, 4 Place Jussieu, F-75005, Paris, France.
    Fluorescent silica MCM-41 nanoparticles based on flavonoids: Direct post-doping encapsulation and spectral characterization2021In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 185, Part A, article id 108870Article in journal (Refereed)
    Abstract [en]

    Flavones and flavonols are naturally-occurring organic molecules with interesting biological, chemical and photophysical properties. In recent years their interaction with silica surfaces has received increasing attention. In this work, the flavonol 3-hydroxyflavone (3HF) and the flavone 7-hydroxyflavone (7HF) have been encapsulated in MCM-41 mesoporous silica nanoparticles (NP) via a post-doping procedure, and their photophysics characterized by both steady state and time-resolved spectroscopic techniques. Both flavonoid-doped NPs resulted to be highly fluorescent, even after two months of exposure to air at room temperature. UV light irradiation results in a moderate decrease of the fluorescence quantum yield. Complementary UV-Vis and fluorescence experiments of 3HF and 7HF in solutions and TD-DFT calculations to simulate absorption and emission spectra have been carried out in order to better rationalize the exact nature of the emitting species. Whereas for 3HF-doped NPs the tautomer emission in the green predominates, the fluorescence of 7HF-doped NPs is likely to arise from the cationic or the phototautomeric form of the flavonoid. The results show that organic fluorophore-based fluorescent silica NPs can be easily obtained by a post-doping procedure and represent a first step towards the development of a simple strategy for the encapsulation in MCM-41 NPs of flavonoids and other organic molecules.

  • 2.
    Naderi, R.
    et al.
    School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran.
    Arman, S.Y.
    Department of Mining and Material Engineering, Amirkabir University of Technology.
    Fouladvand, Shahpar
    Department of Mining and Material Engineering, Amirkabir University of Technology.
    Investigation on the inhibition synergism of new generations of phosphate-based anticorrosion pigments2014In: Dyes and pigments, ISSN 0143-7208, E-ISSN 1873-3743, Vol. 105, p. 23-33Article in journal (Refereed)
    Abstract [en]

    The role of zinc aluminum molybdenum orthophosphate hydrate and zinc calcium strontium aluminum orthophosphate silicate hydrate as new generations of phosphate-based anticorrosion pigments in corrosion protection of mild steel exposed to 3.5% sodium chloride solution was studied using electrochemical techniques as well as surface analysis. Compared to conventional zinc phosphate, superiority of the modified pigments was shown through taking advantage of electrochemical impedance spectroscopy, polarization curves and electrochemical noise measurements. Moreover, a good trend was also observed between electrochemical noise data and the results obtained from electrochemical impedance spectroscopy and potentiodynamic polarization. Protective films deposited on the surface were detected using SEM/EDX in the presence of zinc aluminum molybdenum orthophosphate hydrate and zinc calcium strontium aluminum orthophosphate silicate hydrate releasing more inhibiting species. The effect of immersion time on the film formation was studied through the electrochemical methods. XPS technique was also employed to analyze the sample surface exposed to 3.5% NaCl solution containing combination of the modified pigments. In addition to the surface analysis data, various parameters extracted from the electrochemical measurements revealed corrosion inhibition synergism of the two pigments.

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