The effect of photoactivated transformations of Ag+ and Ag0 in silica fillers on their biocidal activity

Bogatyrov, V. M.; Гунько, В.М.; Galaburda, M.V.; Oranska, O.I.; Petryk, I. S.; Tsyganenko, K. S.; Savchuk, Ya.I.; Chobotarov, A.Yu.; Rudenchyk, T. V.; Rozhnova, R. A.; Galatenko, N.A.

doi:10.1007/s11164-019-03885-2

Cited by 15 publications

(6 citation statements)

References 41 publications

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“…However, it should be noted that this method can only create such structures on the nanosilica surface when the soluble salts are in a hydrated state. The utilization of the GSSMSM method allows for the formation of layers or clusters on the nanosilica surface, using a variety of soluble salts, including NaCl, NH 4 Cl, K 2 HPO 4 , KI, ZnSO 4 , and similar compounds [41,52] …”

Section: Resultsmentioning

confidence: 99%

“…The utilization of the GSSMSM method allows for the formation of layers or clusters on the nanosilica surface, using a variety of soluble salts, including NaCl, NH 4 Cl, K 2 HPO 4 , KI, ZnSO 4 , and similar compounds. [41,52] Insoluble AgI on the surface of nanosilica particles was formed by carrying out exchange reactions between two watersoluble salts, such as silver nitrate (AgNO 3 ) and ammonium iodide (NH 4 I), sequentially deposited on the nanosilica surface using the GSSMSM method. In our the reaction, silver nitrate on the silica surface should be uniformly dispersed, and upon reacting with ammonium iodide, it will produce insoluble AgI on the surface and a volatile and easily decomposable ammonium nitrate salt.…”

Section: Synthesis Of the Nanosilica/agi Composites Using The Gasphas...mentioning

confidence: 99%

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In situ synthesis of AgI on the nanosilica surface for potential application as a cloud seeding material

Nosach,

Bodnar Yankovych,

Skwarek

et al. 2024

ChemPhysChem

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A series of nanosilica/AgI composites was synthesized by in situ reactions between silver nitrate and ammonium iodide deposited on the nanosilica surface using the gas‐phase solvate‐stimulated mechanosorption modification (GSSMSM) under both dry and wet conditions. The characterization of the synthesized materials was performed by X‐ray diffraction (XRD), SEM/EDX (Scanning Electron Microscopy‐Energy Dispersive X‐ray), thermogravimetric (TGA) and gas sorption methods. As a result of the mechanosorption modification of nanosilica, the bulk density of the samples synthesized in the dry and wet medium increases from 45 g/l for initial nanosilica to 249 g/l and 296 g/l for the modified samples, respectively. The specific surface area of the composites decreased in compared to the nanosilica precursor. The SEM data showed a denser aggregate structure of the nanocomposites compared to the initial nanosilica. The XRD, SEM/EDX and TEM/EDX data indicated the formation of AgI clusters. The AgI particle size was in the range of 6‐45 nm. The ice‐forming activity of the AgI‐containing samples was examined as well. The sample with a smaller size of silver iodide on the surface exhibited superior ice‐forming properties, and considering the quantity of utilized AgI, the prepared samples hold promise for application in this field.

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Section: Resultsmentioning

confidence: 99%

Section: Synthesis Of the Nanosilica/agi Composites Using The Gasphas...mentioning

confidence: 99%

In situ synthesis of AgI on the nanosilica surface for potential application as a cloud seeding material

Nosach,

Bodnar Yankovych,

Skwarek

et al. 2024

ChemPhysChem

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“…The shifts are due to the charge transfer between Ag and E. coli. , These XPS shifts have been previously observed during the bacterial inactivation on sputtered surfaces. , …”

Section: Resultsmentioning

confidence: 99%

“…35,48 These XPS shifts have been previously observed during the bacterial inactivation on sputtered surfaces. 56,57 The shifts in the Ag-O signals after bacterial inactivation in Figure 6 are relatively small due to the minor presence of the Ag(II) species. Ag + /Ag 2+ ions do not intervene directly in the bacterial inactivation, but their respective oxides do.…”

Section: ■ Introductionmentioning

confidence: 99%

New Evidence for Ag-Sputtered Materials Inactivating Bacteria by Surface Contact without the Release of Ag Ions: End of a Long Controversy?

Rtimi

Konstantinidis

Britun

et al. 2020

ACS Appl. Mater. Interfaces

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The study provides new evidence for Ag-coated polyester (PES) mediating Escherichia coli inactivation by way of genetically engineered E. coli (without porins, from now denoted porinless bacteria). This allows the quantification of the bactericidal kinetics induced by the Ag surface without the intervention of Ag ions. Bacterial inactivation mediated by Ag-PES was seen to be completed within 60 min. The samples were prepared by high-power impulse magnetron sputtering (HiPIMS) at different sputter powers. In anaerobic media, this process required 120 min. The amounts of ions (Ar + , Ag + , and Ag 2+ ) generated during the deposition by direct current magnetron sputtering (DCMS) and HiPIMS were determined by mass spectrometry. The thickness of the Ag films sputtered on PES by DCMS (0.28 A) during 100 s was found to be 340 nm. Thicknesses of 250, 230, and 200 nm were found when sputtering with HiPIMS was tuned at 8, 17, and 30 A, respectively. By scanning transmission electron microscopy (STEM-HAADF), the atomic distribution of Ag and oxygen was detected. By X-ray photoelectron spectroscopy (XPS), a shift in the Ag oxidation state was observed within the bacterial inactivation period. This reveals redox catalysis within the time required for the total bacterial inactivation due to the interaction between the bacterial suspension and Ag-PES. Surface properties of the Ag-coated PES samples were additionally investigated by X-ray diffraction (XRD). The formation of Ag plasmon was detected by diffuse reflectance spectroscopy (DRS) and was a function of the applied sputtering energy. The indoor sunlight irradiation dose required to induce an accelerated bacterial inactivation was found to be 5−10 mW/cm 2 .

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“…The Ag/SiO 2 fillers were synthesized following a procedure that has been reported previously (Figure 1) [32]. In summary, silica was modified by the formation of Ag(NH 3 ) 2+ complexes during mechanochemical mixing in a porcelain ball mill (2 L volume) using different amounts of AgNO 3 and SiO 2 components in the presence of ammonia solution (I stage).…”

Section: Sample Synthesismentioning

confidence: 99%

Ag-Containing Carbon Nanocomposites: Physico-Chemical Properties and Antimicrobial Activity

Galaburda,

Zienkiewicz-Strzalka,

Blachnio

et al. 2023

Sustainability

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The subject of the present work is the synthesis and analysis of the structural and morphological properties of Ag-containing carbon composites and the investigation of their practical application in water purification and disinfection. A series of composites were synthesized by carbonization of resorcinol–formaldehyde polymers filled with Ag-containing fumed silica under an inert atmosphere at 800 °C. The as-synthesized micro- and mesoporous carbon composites were characterized by their specific surface area of 466–529 m2/g. The suitability of the composites for flow-through filters was evaluated by kinetic studies on the adsorption of 4-chlorophenol. The composite with the highest amount of metallic nanophase showed the most effective kinetics with a rate constant (log k) and half-life (t0.5) of −2.07 and 81 min, respectively. The antimicrobial susceptibility was determined against Gram-positive (Staphylococcus aureus ATCC 25923) and Gram-negative strains (Escherichia coli ATCC 25922, Klebsiella pneumoniae ATCC 700603, Pseudomonas aeruginosa ATCC 27853, and Acinetobacter baumannii ATCC 19606). The zones of bacterial growth inhibition correlated with the silver nanoparticle content and were the lowest for RFC-02 (10–12 mm) and the highest for the RFC-1 composite (15–16 mm), resulting from the increase in number of evenly distributed small Ag nanoparticles (3–5 nm) in the samples.

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The effect of photoactivated transformations of Ag+ and Ag0 in silica fillers on their biocidal activity

Cited by 15 publications

References 41 publications

In situ synthesis of AgI on the nanosilica surface for potential application as a cloud seeding material

In situ synthesis of AgI on the nanosilica surface for potential application as a cloud seeding material

New Evidence for Ag-Sputtered Materials Inactivating Bacteria by Surface Contact without the Release of Ag Ions: End of a Long Controversy?

Ag-Containing Carbon Nanocomposites: Physico-Chemical Properties and Antimicrobial Activity

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