Synthesis and antibacterial properties of novel Al<sub>2</sub>O<sub>3</sub>-Ag anodised composite coating

Dehghan, F.; Mardanpour, H. S.; Kamali, S.; Alirezaei, S.

doi:10.1080/10667857.2020.1794276

Cited by 5 publications

(5 citation statements)

References 32 publications

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“…The three series of samples exhibit comparable thickness values, suggesting that the addition of silver nitrate to the sulfuric acid bath does not affect the anodizing process yield. A similar behavior was previously observed by Dehghan et al [60], who co-deposited silver nanoparticles during the anodization process. The deposition of the silver powder on the samples during the anodization presumably takes place by two different steps.…”

Section: Coatings Morphologysupporting

confidence: 88%

“…The morphology of the samples is similar to the Al 2 O 3 -Ag composite layers produced in previous works in literature [60,68]: these studies have highlighted the absence of crystallinity in the composite material, which appears completely amorphous and in which the low amount of Ag cannot be detected in XRD patterns.…”

Section: Coatings Morphologysupporting

confidence: 76%

“…In recent years, silver has been deposited on the anodized layer by the electroless deposition method [56][57][58], but also by exploiting alternative techniques, such as hydrothermal deposition [59] or via the photoreduction deposition method [59]. However, Dehghan et al [60] developed a simple process of co-deposition of silver powder with alumina during the anodizing step.…”

Section: Introductionmentioning

confidence: 99%

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Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

et al. 2021

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The emergence and spreading of the SARS-CoV-2 pandemic has forced the focus of attention on a significant issue: the realization of antimicrobial surfaces for public spaces, which do not require extensive use of disinfectants. Silver represents one of the most used elements in this context, thanks to its excellent biocidal performance. This work describes a simple method for the realization of anodized aluminum layers, whose antimicrobial features are ensured by the co-deposition with silver nitrate. The durability and the chemical resistance of the samples were evaluated by means of several accelerated degradation tests, such as the exposure in a salt spray chamber, the contact with synthetic sweat and the scrub test, highlighting the residual influence of silver in altering the protective behavior of the alumina layers. Furthermore, the ISO 22196:2011 standard was used as the reference protocol to set up an assay to measure the effective antibacterial activity of the alumina-Ag layers against both Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) bacteria, even at low concentrations of silver. Finally, the Ag-containing aluminum oxide layers exhibited excellent antimicrobial performances also following the chemical–physical degradation processes, ensuring good durability over time of the antimicrobial surfaces. Overall, this work introduces a simple route for the realization of anodized aluminum surfaces with excellent antibacterial properties.

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Section: Coatings Morphologysupporting

confidence: 88%

Section: Coatings Morphologysupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

et al. 2021

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“…Silver has been applied to different types of surfaces. Anodized aluminum layers have shown good compatibility with different types of silver-based fillers, confirming excellent antibacterial performance [47][48][49]. Furthermore, antimicrobial silver has been encapsulated in TiO 2 coatings [50] and TiO 2 nanotubes [51], deposited on cotton fabric [52], and implemented in a Mg-Al layered double hydroxide coating [53].…”

Section: Introductionmentioning

confidence: 78%

Durability of Acrylic Cataphoretic Coatings Additivated with Colloidal Silver

Calovi

Rossi

2022

Coatings

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In this work, colloidal silver has been added into an acrylic clear cataphoretic bath, evaluating the effect of two different filler amounts on the durability of the composite coatings. The three series of samples were characterized by electron microscopy to assess the possible change in morphology introduced by the silver-based additive. The protective properties of the coatings were evaluated by a salt spray chamber exposure and electrochemical impedance spectroscopy measurements, evidencing the negative effect provided by high amount of silver, which introduced discontinuities in the acrylic matrix. Finally, the durability of composite coatings was studied by exposing them to UV-B radiation, observing a strong phenomenon of silver degradation. Although the coating containing high concentrations of silver demonstrated poor durability, this study revealed that small amounts of silver can be used to provide particular aesthetic features, but also to improve the protective performance of cataphoretic coatings.

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“…The literature offers the first work in which the anodized aluminum has been reinforced with silver already 20 years ago, by means of an electrodeposition process, providing the surface with innovative antibacterial performances . This work represented a point of reference for several subsequent studies, which have tried to deposit silver on the anodized aluminum surface by exploiting different techniques, such as the electroless deposition method, − the hydrothermal deposition process, the photoreduction deposition method, or a simple process of codeposition of silver powder with alumina during the anodizing step . The latter method seems to be the most encouraging, as the recent work has highlighted the excellent bactericidal performance of the surfaces obtained by codeposition with silver nitrate …”

Section: Introductionmentioning

confidence: 99%

Innovative Codeposition of a Ag–Al₂O₃ Layer: An Attractive Combination of High Durability and Lack of Cytotoxicity for Public Space Applications

et al. 2022

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Today, the use of silver in surfaces for public environments is very frequent, as it ensures high antimicrobial activities, avoiding the continuous disinfection of the surfaces themselves. Similarly, thanks to its interesting combination of technological properties, anodized aluminum is widely employed in the production of components for applications in public spaces. Therefore, this work describes a simple method of the codeposition of silver and anodized aluminum to combine the remarkable properties of Al 2 O 3 layers with the antibacterial performances of silver. The effect of silver in modifying the durability features of the anodized aluminum layer was evaluated by means of various accelerated degradation techniques, such as the exposure in a climatic chamber to UV-B radiation or an aggressive atmosphere simulated by the Kesternich test. These analyses showed the good compatibility between Ag and the alumina matrix, whose durability performances were not particularly influenced by silver. Furthermore, the composite layers did not express relevant cytotoxicity activity, as evidenced by Trypan blue flow cytometry analysis and microscopy observations, ensuring the possible use of this material in applications in close contact with humans. This same conclusion was reached by observing an almost negligible ionic release of Ag by the composite layers, even following severe degradation of the alumina matrix due to exposure to a particular acid solution. In conclusion, this work presents an innovative material that can be used in public spaces, thanks to its interesting combination of high durability and low cytotoxicity.

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Synthesis and antibacterial properties of novel Al₂O₃-Ag anodised composite coating

Cited by 5 publications

References 32 publications

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Durability of Acrylic Cataphoretic Coatings Additivated with Colloidal Silver

Innovative Codeposition of a Ag–Al₂O₃ Layer: An Attractive Combination of High Durability and Lack of Cytotoxicity for Public Space Applications

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Synthesis and antibacterial properties of novel Al2O3-Ag anodised composite coating

Cited by 5 publications

References 32 publications

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

Durability of Acrylic Cataphoretic Coatings Additivated with Colloidal Silver

Innovative Codeposition of a Ag–Al2O3 Layer: An Attractive Combination of High Durability and Lack of Cytotoxicity for Public Space Applications

Contact Info

Product

Resources

About

Synthesis and antibacterial properties of novel Al₂O₃-Ag anodised composite coating

Innovative Codeposition of a Ag–Al₂O₃ Layer: An Attractive Combination of High Durability and Lack of Cytotoxicity for Public Space Applications