Journal ArticleDOI
Oxidative dissolution of silver nanoparticles: A new theoretical approach
Zbigniew Adamczyk,Magdalena Oćwieja,Halina Mrowiec,Stanisław Walas,Dawid Lupa +4 more
- Vol. 469, pp 355-364
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TLDR
It was shown that the theoretical model adequately reflects the main features of the experimental results, especially the significant increase in the dissolution rate for lower pH, and the presence of two kinetic regimes was quantitatively explained in terms of the decrease in the coverage of the fast dissolving oxide layer.Abstract:
A general model of an oxidative dissolution of silver particle suspensions was developed that rigorously considers the bulk and surface solute transport. A two-step surface reaction scheme was proposed that comprises the formation of the silver oxide phase by direct oxidation and the acidic dissolution of this phase leading to silver ion release. By considering this, a complete set of equations is formulated describing oxygen and silver ion transport to and from particles' surfaces. These equations are solved in some limiting cases of nanoparticle dissolution in dilute suspensions. The obtained kinetic equations were used for the interpretation of experimental data pertinent to the dissolution kinetics of citrate-stabilized silver nanoparticles. In these kinetic measurements the role of pH and bulk suspension concentration was quantitatively evaluated by using the atomic absorption spectrometry (AAS). It was shown that the theoretical model adequately reflects the main features of the experimental results, especially the significant increase in the dissolution rate for lower pH. Also the presence of two kinetic regimes was quantitatively explained in terms of the decrease in the coverage of the fast dissolving oxide layer. The overall silver dissolution rate constants characterizing these two regimes were determined.read more
Citations
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Environmental Transformations of Silver Nanoparticles: Impact on Stability and Toxicity
Clément Levard,Clément Levard,E. Matt Hotze,E. Matt Hotze,Gregory V. Lowry,Gregory V. Lowry,Gordon E. Brown,Gordon E. Brown,Gordon E. Brown +8 more
TL;DR: This review discusses the major transformation processes of Ag-NPs in various aqueous environments, particularly transformations of the metallic Ag cores caused by reactions with (in)organic ligands, and the effects of such transformations on physical and chemical stability and toxicity.
Journal ArticleDOI
Do physico-chemical properties of silver nanoparticles decide their interaction with biological media and bactericidal action? A review.
TL;DR: The mechanisms behind the confrontation of bacteria against various drugs and the effect of physico-chemical properties of silver species on their bactericidal action are discussed as well as the available reports on bacterial transcriptomic and proteomic profiles upon the exposure of various silver species are critically evaluated.
Journal ArticleDOI
Time, pH, and size dependency of silver nanoparticle dissolution: the road to equilibrium
TL;DR: In this paper, the authors quantify the kinetics, pH, and size dependency of silver ion (Ag+) release from AgNPs and explain their results in a consistent manner with a mechanistic view.
Journal ArticleDOI
Antimicrobial potency of differently coated 10 and 50 nm silver nanoparticles against clinically relevant bacteria Escherichia coli and Staphylococcus aureus.
Anna-Liisa Kubo,Ivona Capjak,Ivana Vinković Vrček,Olesja Bondarenko,Imbi Kurvet,Heiki Vija,Angela Ivask,Kaja Kasemets,Anne Kahru,Anne Kahru +9 more
TL;DR: Antibacterial properties of nanoAg were addressed by determining their minimal bactericidal concentrations in deionised water to minimise the influence of silver speciation on its bioavailability and were the interplay of NP size, solubility and surface coating.
Journal ArticleDOI
Hepato(Geno)Toxicity Assessment of Nanoparticles in a HepG2 Liver Spheroid Model.
Elisabeth Elje,Elisabeth Elje,Espen Mariussen,Oscar H. Moriones,Oscar H. Moriones,Neus G. Bastús,Víctor F. Puntes,Víctor F. Puntes,Yvonne Kohl,Maria Dusinska,Elise Rundén-Pran +10 more
TL;DR: The HepG2 spheroid model is a promising advanced in vitro model for toxicity assessment of NPs, and cytotoxic and genotoxic responses induced by titanium dioxide, silver and zinc oxide nanoparticles are compared.
References
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Book
Diffusion: Mass Transfer in Fluid Systems
TL;DR: An overview of diffusion and separation processes brings unsurpassed, engaging clarity to this complex topic as mentioned in this paper, which is a key part of the undergraduate chemical engineering curriculum and at the core of understanding chemical purification and reaction engineering.
Journal ArticleDOI
A review of the antibacterial effects of silver nanomaterials and potential implications for human health and the environment
TL;DR: A review of the antibacterial effects of silver nanomaterials, including proposed antibacterial mechanisms and possible toxicity to higher organisms, is presented in this paper, where the authors suggest that further research is warranted given the already widespread and rapidly growing use of silver nanoparticles.
Journal ArticleDOI
Negligible Particle-Specific Antibacterial Activity of Silver Nanoparticles
TL;DR: This work suggests that AgNP morphological properties known to affect antimicrobial activity are indirect effectors that primarily influence Ag(+) release, and antibacterial activity could be controlled by modulating Ag(+ release, possibly through manipulation of oxygen availability, particle size, shape, and/or type of coating.
Journal ArticleDOI
Ion Release Kinetics and Particle Persistence in Aqueous Nano-Silver Colloids
Jingyu Liu,Robert H. Hurt +1 more
TL;DR: An empirical kinetic law is proposed that reproduces the observed effects of dissolution time, pH, humic/fulvic acid content, and temperature observed here in the low range of nanosilver concentration most relevant for the environment.
Journal ArticleDOI
Silver nanoparticles: partial oxidation and antibacterial activities.
Chun-Nam Lok,Chi Ming Ho,Rong Chen,Qing-Yu He,Wing-Yiu Yu,Hongzhe Sun,Paul K.H. Tam,Jen Fu Chiu,Chi-Ming Che +8 more
TL;DR: The results show that the antibacterial activities of silver nanoparticles are dependent on chemisorbed Ag+, which is readily formed owing to extreme sensitivity to oxygen.
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