Tuning of the ion release properties of silver nanoparticles buried under a hydrophobic polymer barrier

Alissawi, N.; Zaporojtchenko, V.; Strunskus, Thomas; Hrkac, T.; Kocabas, I.; Erkartal, Burak; Chakravadhanula, Venkata Sai Kiran; Kienle, Lorenz; Grundmeier, Guido; Garbe‐Schönberg, Dieter; Faupel, Franz

doi:10.1007/s11051-012-0928-z

Cited by 49 publications

(27 citation statements)

References 35 publications

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“…In contrast, a dominant shift to smaller wavelength occurred due to changes in the morphology, size distribution, and the interparticle distance. These changes are similar to the changes that occurred in the pure AgNPs system shown in our previous work [15]. However, the rate of the change in the SPR peak absorbance maxima values and its position after immersion of the samples in water is slower than that for the pure silver due to the increase of the Au fraction on the expense of Ag in the alloy, in accordance with the results from the ICP-MS and XPS measurements.…”

Section: Silver Ion Release Studiessupporting

confidence: 90%

“…The nanoparticles density looks smaller after 3 days in water, and the interparticle distance increases as a result of the reduction of the Ag [31] fraction due to Ag ion release which is more favorable from the smaller particles. Additionally, other NPs may undergo Ostwald ripening process, i.e., growth of large particles by dissolution of small particles driven by the particle size dependence of its standard electrode potential, in a way similar to what we observed before for pure AgNPs [15,16]. Moreover, no Au shell formation was observed here either.…”

Section: Silver Ion Release Studiessupporting

confidence: 84%

“…The 5.5-nm nominal thickness Ag and Au alloy nanoparticles have almost a similar size distribution and an average diameter of about 5 nm as the pure AgNPs prepared in the same way and same amount as was shown in the previous work [15]. The position of the plasmon absorption peak of these alloy NPs, however, depends linearly on the composition of the alloy particles when expressed in terms of the gold fraction as reported previously [2,14,24,25].…”

Section: Au-ag Alloy Np Systemssupporting

confidence: 77%

“…We observed a correlation between changes in surface plasmon resonance and kinetics of Ag ion release and that the strong dependence of the silver ion release on the particle size leads to a significant redistribution of the composite morphology and suppression of the Ag ion release rate with time. It was also shown that a polymer barrier stabilizes the morphology of the composites and can be applied to control the Ag ion release rate [15]. Besides, in situ electrochemical impedance spectroscopy-ultravioletvisible spectroscopy (UV-vis) and AFM studies have been also preformed on the same nanocomposite system by our collaborative group indicating the stability of the AgNPs after covering by a PTFE barrier and the slowing of the silver ion release rate [16].…”

Section: Introductionmentioning

confidence: 93%

“…More details about the pH control can be found in our previous publication [15]. UV-vis and XPS measurements were carried out on the samples during an immersion time of seven days starting from 40 min to check the variations, and the water was checked by ICP-MS to detect the Ag ions concentrations.…”

Section: Silver Ion Release Measurementsmentioning

confidence: 99%

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Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

et al. 2012

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In the present study, nanocomposites containing Ag-Au alloy nanoparticle ensembles with various compositions on polytetrafluoroethylene were prepared by physical vapor deposition. After a certain time of immersion of the samples in water, oxidation and dissolution of the Ag nanoparticles (AgNPs) occurred, and changes in the morphology, optical properties and composition of the nanocomposites were examined using transmission electron microscopy, ultraviolet-visible spectroscopy and X-ray photoelectron spectroscopy (XPS), respectively. The composition-dependence and the time-dependence of the silver ion release were studied, and the concentration of the silver ions in water was detected using inductively coupled plasma mass spectrometry. The results indicate that with increasing gold fraction in the AuAg alloy nanoparticles, a strong improvement of the oxidation resistance of the AgNPs occurs. The dissolution of Ag is rapid at the first contact of the sample with water until a saturation state is reached. XPS synchrotron measurements with different excitation energies show that the depletion of Ag from the nanoparticles does not lead to the formation of a Au-rich shell and that the atomic mobility is high enough in the small nanoparticles of about 5 nm average size to equilibrate any concentration gradient.

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Section: Silver Ion Release Studiessupporting

confidence: 90%

Section: Silver Ion Release Studiessupporting

confidence: 84%

Section: Au-ag Alloy Np Systemssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 93%

Section: Silver Ion Release Measurementsmentioning

confidence: 99%

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Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

et al. 2012

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Different cytotoxicity responses to antimicrobial nanosilver coatings when comparing extract‐based and direct‐contact assays

Sussman

Casey

Dutta

et al. 2015

J of Applied Toxicology

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This study was performed to understand how the choice of cytotoxicity assay format affects the observed biocompatibility of nanosilver (nAg). nAg coatings are physical coatings containing silver (Ag) that have feature sizes of 100 nm or less, often in the form of nanoparticles or grains. They are used on medical devices to prevent infection, but in spite of this intended benefit, observations of potential cytotoxicity from nAg have been reported in numerous published studies. For medical device regulation, cytotoxicity testing is part of a biocompatibility evaluation, in which specific test methods are chosen based on the technological characteristics and intended use of a device. For this study, nAg-coated tissue culture polystyrene surfaces were prepared using magnetron sputter coating, resulting in nAg films of 0.2 to 311 µg cm(-2) Ag. These coatings exhibited nanometer-scale morphologies and demonstrated a > 4log10 reduction in Escherichia coli viability. It was observed that extracts of nAg caused no cytotoxicity to L929 mouse fibroblasts, but cells cultured directly on nAg coatings (direct-contact assay format) showed a dose-dependent reduction in viability by up to 100% (P < 0.001). Results using inductively coupled plasma mass spectrometry to measure Ag release suggested that extracts of nAg are not toxic because the dissolved Ag in those samples becomes less cytotoxic over time, probably owing to the reaction with cell culture media and serum (six-fold cytotoxicity reductions observed over a 24-h period). These findings highlight the potential value of direct-contact cytotoxicity testing for nAg in predicting biological interactions with cells or tissue in vivo.

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A comprehensive review of the polymer‐based hydrogels with electrochemically synthesized silver nanoparticles for wound dressing applications

Nešović

Mišković‐Stanković

2020

Polymer Engineering & Sci

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Modernization and improvement of wound dressing materials is an important topic in biomaterials and biomedicine fields, as the traditional materials are inadequate and susceptible to bacterial infections. In recent times, polymerbased hydrogel materials have presented themselves as excellent candidates for new-generation wound dressings with improved properties, such as high sorption ability, good mechanical properties, and low adhesiveness. Additionally, cross linked hydrogel matrices serve as excellent carriers for controlled release of antibacterial agents, such as silver nanoparticles (AgNPs), which are preferred over conventional antibiotics due to multi-phase mechanism of action and low susceptibility to induce bacterial resistance. Their incorporation inside polymer matrices allows improvement of wound dressing properties and sustained protection against bacterial infection. Electrochemical methods for AgNPs synthesis are facile and green alternatives to chemical routes, allowing the formation of highly stable AgNPs with strong antibacterial effect. In this article, we aim to provide a comprehensive review of the existing research on the topic of electrochemically synthesized silver nanoparticles incorporated in polymer matrices with a special focus on the chitosan-based hydrogels as prospective materials for wound dressing applications.

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Tuning of the ion release properties of silver nanoparticles buried under a hydrophobic polymer barrier

Cited by 49 publications

References 35 publications

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

Effect of gold alloying on stability of silver nanoparticles and control of silver ion release from vapor-deposited Ag–Au/polytetrafluoroethylene nanocomposites

Different cytotoxicity responses to antimicrobial nanosilver coatings when comparing extract‐based and direct‐contact assays

A comprehensive review of the polymer‐based hydrogels with electrochemically synthesized silver nanoparticles for wound dressing applications

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