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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.
Silver nanoparticles decorated graphene oxide nanocomposite for bone regeneration applications
Published in Inorganic and Nano-Metal Chemistry, 2020
Cuilan An, Pan Hao, Huilian Li, Bahman Nasiri-Tabrizi
The probable mechanism involves the connection of AgNPs to the microbial surface, which is supposed to be interceded by an electrostatic interplay between the negatively charged cell membrane of many microbes and positive surface charged nanoparticles.[76–78] When nanoparticles adhere to microbial cells, they can penetrate them, causing damage to their internal constituents. The cellular internalization of AgNPs is also able to induce the production of reactive oxygen species (ROS) and stimulate oxidative stress in bacterial cells owing to liberated Ag+ ions. It is reported that the surface of AgNPs is oxidized in the presence of dissolved oxygen in an aqueous solution, and the oxidative dissolution of silver nanoparticles results in Ag+ ions.[72] Accordingly, both silver nanoparticles and silver ions can damage microbial cells by interacting with existing sulfur-containing proteins in microbial membranes or inward these cells, as well as with phosphorus-comprising compounds, for instance, DNA. These chemical connections can cause the inactivation of such proteins in the microbial cell wall, which ultimately could result in the death of microorganisms. In this context, the antibacterial behavior of AgNPs-GO nanocomposite could be attributed to synergism between the AgNPs-GO and the microbial cells as well as the silver ions dissolution from the AgNPs.