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Dissolution of Silver Nanoparticles
Published in Huiliang Cao, Silver Nanoparticles for Antibacterial Devices, 2017
Erchao Meng, Qingbo Zhang, Feng Li, Tanya S. Peretyazhko
This chapter summarises the recent advances in the field of the dissolution of silver nanoparticles in an aqueous system. Silver nanoparticles in water can be oxidised by dissolved oxidant such as oxygen or hydrogen peroxide, leading to the release of silver ions. The dissolution rate of silver nanoparticles usually follows the first order and reaches equilibrium after a few days to a few months. The thermodynamics and kinetics of dissolution are dependent on both the environmental conditions and the characteristics of the nanoparticles. The silver ions generated from the oxidative dissolution of silver nanoparticles plays a predominant role in the antibacterial activity of silver nanoparticles.
Modification of nano-silver bioactivity by adsorption on carbon nanotubes and graphene oxide
Published in Inhalation Toxicology, 2018
Raymond F. Hamilton, Zheqiong Wu, Megha Thakkar, Andrij Holian, Somenath Mitra
It is has been proposed that the toxicity of silver nanoparticles depends on the amount of silver ions released from the surface of the particles (Choi & Hu, 2008; He et al., 2013; Lee et al., 2005; Morones et al., 2005; Zhang et al., 2003). The concentration of dissolved silver released from silver nanoparticle depends upon several factors such as surface area, oxidative dissolution of silver nanoparticles associated with supporting matrix, dissociation of dissolved silver and transport from the matrix, and adsorption equilibrium of dissolved silver onto supporting material (Hamilton et al., 2014; He et al., 2013). Ion release has been reported to be an oxidation process involving dissolved oxygen and proton concentration (Equation (1); Liu & Hurt, 2010). Fuvlic acid was demonstrated to inhibit this reaction, the reason including surface adsorption to block silver nanoparticle oxidation sites and reversible reaction of released silver ion to silver as reductant (Liu & Hurt, 2010). It has been reported that carbon can delay the release of silver ions from nanoparticles, but the mechanism is not well understood (He et al., 2013). In the carbon reducing environment, a possibility is that C=C groups may enhance the reduction of dissolved silver ions to silver nanoparticles (He et al., 2013). Therefore, it is important to investigate the effect of carbon as the supporting material on antibacterial ability of silver nanoparticles.
Simulated biological fluids – a systematic review of their biological relevance and use in relation to inhalation toxicology of particles and fibres
Published in Critical Reviews in Toxicology, 2021
Emma Innes, Humphrey H. P. Yiu, Polly McLean, William Brown, Matthew Boyles
Degradation (EFSA, in relation to nanomaterials) – as used herein is the process by which a nanomaterial is converted to degradation products in the form of a nanomaterial or to solutes with the loss of nano features. Oxidative dissolution of silver nanoparticles with the release of Ag + ions is a relevant example.