Abstract
Generation rates of hydrogen peroxide (H2O2), hydroxyl radicals (•OH), molecular hydrogen (H2), and molecular oxygen (O2) forming during the optical breakdown of aqueous colloidal solutions containing Au, Mo, Zr, Fe, and Ni nanoparticles have been studied. It is shown that the processes occurring during the dissociation of water molecules under the influence of laser breakdown plasma and leading to the formation of various chemical products depend on the material of the nanoparticles present in the colloid. It was found that the highest rates of generation of water decomposition products are observed in aqueous colloidal solutions of Fe and Ni nanoparticles. The use of Au nanoparticles leads to the lowest generation rate. In general, the materials from which the nanoparticles are made, depending on the efficiency of the formation of water decomposition products, are arranged as follows: Ni> Fe> Mo> Zr> Au.
Highlights
The processes occurring under the action of high-power laser radiation on a matter has been actively studied since the creation of the first high-power lasers
The optical breakdown of liquids is intensively studied [1,2,3]. This topic is mainly associated with laser ablation technologies in liquids [4,5,6] and Laser-Induced Breakdown Spectroscopy (LIBS) technology [7,8,9]
It is known that the intensity of the processes occurring during the optical breakdown of liquids can increase significantly when nanoparticles are added to the liquid
Summary
The processes occurring under the action of high-power laser radiation on a matter has been actively studied since the creation of the first high-power lasers. The optical breakdown of liquids is intensively studied [1,2,3]. It is known that the intensity of the processes occurring during the optical breakdown of liquids can increase significantly when nanoparticles are added to the liquid. It has been shown that the rate of generation of H2 and O2 during optical breakdown of a liquid containing nanoparticles increases significantly [10, 11]. In the case of optical breakdown in the presence of gold nanoparticles in water, the rate of generation of hydroxyl radicals increases by almost two orders of magnitude [12]; similar results were obtained for hydrogen peroxide. It was found that the rate of generation of water decomposition products is significantly affected by the concentration of nanoparticles in an aqueous solution
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