Colloidal silver as innovative multifunctional pigment: The effect of Ag concentration on the durability and biocidal activity of wood paints

Calovi, Massimo; Coroneo, Valentina; Palanti, Sabrina; Rossi, Stefano

doi:10.1016/j.porgcoat.2022.107354

Cited by 19 publications

(18 citation statements)

References 106 publications

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“…Furthermore, the prepared nano AgCu alloy as an antibacterial in this study shows significant advantages compared to the common antimicrobial nanomaterials (Figure ). The antimicrobial rate against E. coli at 100% could be realized with an extremely low dosage of nano AgCu (0.001%), which is much lower than the reported values. ,,− Similarly, trace nano AgCu alloy (0.001%) endows a 100% antibacterial effect against S. aureus , which surpasses the familiar nano antibacterials. ,,,− ,− Besides, the antibacterial time of nano AgCu alloy with100% reduction in bacterial counts could be largely shortened from 4–8 h ,, to 1 min. Therefore, the nano AgCu alloy with superior antibacterial property in low concentration and short time shows potential in constructing highly antibacterial wood.…”

Section: Resultsmentioning

confidence: 85%

“…15 Colloidal silver was employed in the formulation of the silverbased wood paint, showing a reduction of about 99.99% of viable bacteria. 16 Silver nanoparticle-loaded melamine resin applied onto the parquet floor was able to kill almost all the E. coli cultivated on its surface. 17 However, the cost issue of nano Ag and the resistance of nano Cu on some bacteria still hinder their popularization.…”

Section: Introductionmentioning

confidence: 99%

“…In-situ growth of silver particles on the wood surface by the silver mirror reaction could endow the antimicrobial rate of 99.9% . Colloidal silver was employed in the formulation of the silver-based wood paint, showing a reduction of about 99.99% of viable bacteria . Silver nanoparticle-loaded melamine resin applied onto the parquet floor was able to kill almost all the E. coli cultivated on its surface .…”

Section: Introductionmentioning

confidence: 99%

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AgCu Nanoparticles as an Antibacterial Coating for Wood

Qi,

Wei,

Dong

et al. 2024

ACS Appl. Nano Mater.

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Nano inorganic antibacterial materials (such as nano silver and nano copper) are popular in preventing the spread of bacteria on wood and protecting human health. However, their antibacterial activity and cost are always difficult to balance, and their leachability during the applied procedure impedes service life. Herein, a low-cost nano AgCu alloy with high antibacterial activity is synthesized by a liquid reduction method and further physically mixed with waterborne paint to fabricate the composite paint. The obtained nano AgCu alloy is demonstrated to possess superior antibacterial performance against Escherichia coli and Staphylococcus aureus with a low concentration (10 ppm), a short time (1 min), and a 100% antibacterial rate, due to the synergistic effect between Ag and Cu, and the promoted release of Ag ion. Meanwhile, the composite coating containing nano AgCu alloy could endow the effective migration of Ag ions and further facilitate the high durability and maintain the lasting antibacterial effect on the wood surface by reducing the leaching rate of nano alloy particles from 1.58% to 0.62%. This work provides a reference for future research and development on antibacterial coatings of wood surfaces.

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Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

AgCu Nanoparticles as an Antibacterial Coating for Wood

Qi,

Wei,

Dong

et al. 2024

ACS Appl. Nano Mater.

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“…The exposure to the UV-B radiation results in an increase in the intensity of the peak at 1729 cm −1 , which is accompanied by a reduction in the signal of the peak at 1233 cm −1 . This phenomenon corresponds to the decay of the wood panel, represented by the alteration of the cellulose chemical structure [35]. The SEM observations suggest that the protective performance of the coating is reduced as the concentration of fibers increases, as they introduce significant defects in the polymeric matrix.…”

Section: Uv-b Exposurementioning

confidence: 97%

“…On the other hand, nanoparticles with high hardness, stiffness, and thermal stability, such as nanosilica [27], nanoalumina [28], nanoclay [29], and nanocellulose [30], can be used to increase the mechanical properties and water repellency of wood coatings [31]. Moreover, with the application of nanomaterials such as copper nanopowders [32], nanotitanium [33], and silver [34,35], wood paint can gain significant antibacterial properties. Finally, using copper [36], silver nanoparticles [37], or combining fungicidal agents such as propiconazole and thiabendazole [38], the degradation of wood caused by fungal activity has been significantly reduced.…”

Section: Introductionmentioning

confidence: 99%

Impact of High Concentrations of Cellulose Fibers on the Morphology, Durability and Protective Properties of Wood Paint

Calovi

Rossi

2023

Coatings

Self Cite

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This work aims to reveal the effect of a high amount of cellulose fibers on the durability and protective behavior of a bio-based wood paint. The influence of the filler on the morphology of the coatings was investigated by scanning electron microscopy observations, while the durability of the paint was evaluated by exposing the samples to UV-B radiation and continuous thermal shocks. Infrared spectroscopy analysis, colorimetric inspections, adhesion tests and scanning electron microscope observations were employed to assess the role of the high concentrations of fillers in affecting the resilience of the acrylic matrix. Moreover, the impact of the filler on the barrier performance of the coatings was estimated using a liquid resistance test and a water uptake test. Finally, the mechanical properties of hardness and abrasion resistance of the layers were evaluated by means of the Buchholz Hardness Indentation test and the Scrub test. Ultimately, this study demonstrates the pros and cons of using large amounts of cellulose fibers as filler in wood paint: the work warns against the excessive use of these fibers, which need a threshold limit so as not to significantly change the coating’s structure and thereby weaken its protective properties.

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Antibacterial efficiency over time and barrier properties of wood coatings with colloidal silver

Calovi

Coroneo

Rossi

2023

Appl Microbiol Biotechnol

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This work aims to represent a standard application for understanding the extent of the antibacterial efficacy of coatings with different amounts of colloidal silver on wooden surfaces over time. The key variable that was intended to be evaluated in this study was the “time efficiency,” with concerns about the possible efficacy in the durability of the surfaces. By highlighting the “expiry date” of the agents, as in the case with other products, the study aimed to confirm the validity of the simulation tests conducted in the laboratory with degradation tests. Furthermore, the role of the silver amount on the barrier performance of the coatings was assessed by liquid resistance, water uptake, and perspiration tests, evaluating the aesthetic durability of the coatings by means of colorimetric analyses. Ultimately, this work demonstrates that these coatings may represent alternatives in terms of prolonged antimicrobial activity when compared with the biocide agents currently in use, capable to offer good resistance to detergent solutions and to water. Nevertheless, due to silver’s susceptibility to extended exposure to acidic solutions, the findings of the research discourage the utilization of colloidal silver in wood paints intended for use in public settings. Key points • Colloidal silver does not alter the deposition process and does not introduce defects in the wood paint. • Coatings containing silver show high antimicrobial activity over time, against both E.coli and S.aureus. • The silver-based filler resists contact with detergents and aqueous solutions but suffers oxidation processes in acidic environments.

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Colloidal silver as innovative multifunctional pigment: The effect of Ag concentration on the durability and biocidal activity of wood paints

Cited by 19 publications

References 106 publications

AgCu Nanoparticles as an Antibacterial Coating for Wood

AgCu Nanoparticles as an Antibacterial Coating for Wood

Impact of High Concentrations of Cellulose Fibers on the Morphology, Durability and Protective Properties of Wood Paint

Antibacterial efficiency over time and barrier properties of wood coatings with colloidal silver

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