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- W624022859 abstract "Understanding the synthesis dynamics of nanoparticles in liquid–phase laser ablation is very important to optimize and control the size and the structure of nanoparticles. In the present study, firstly, we investigated the synthesis dynamics of nanoparticles synthesized by laser ablation in water, in particular the place of the growth of nanoparticles. Secondly, we investigated the effect of cavitation bubble on the synthesis dynamics of nanoparticles. Thirdly, for the first time, we examined the effect of water pressure on the synthesis dynamics of nanoparticles, the dynamics of cavitation bubble, and the size and the structure of nanoparticles. In chapter 2, we examined the effect of water pressure on the dynamics of cavitation bubble by shadowgraph imaging technique. We observed that increasing water pressure affects the dynamics of cavitation bubble. In chapter 3, we investigated the dynamics of cavitation bubble theoretically by solving Rayleigh–Plesset model for spherical bubble filled with liquid vapor. We introduced modifications to fit the dynamics of the cavitation bubble produced by liquid–phase laser ablation. We estimated the pressure and the temperature inside the cavitation bubble. In addition, we observed that, increasing the pressure of the ambient water affects the thermodynamic parameters of water. In chapter 4, we investigated the growth processes of nanoparticles by employing simultaneous shadowgraph and laser light scattering techniques. We observed that the growth of nanoparticles occurred inside the cavitation bubble from the early phase of expansion to the collapse and the boundaries of cavitation bubble were the favorite places for the growth processes. In chapter 5, we examined the effect of water pressure on the growth of nanoparticles. As a result, we observed that the size of nanoparticles was constant inside the cavitation bubble from the early phase of expansion to the collapse and the growth occurred in the number of nanoparticles. In addition, we expected that both of the size and the number of nanoparticles decreased with pressurizing the ambient liquid. In chapter 6, we synthesized the semiconductor ZnO nanoparticles and examined the effect of water pressure on the size and the structure of nanoparticles. We observed that increasing water pressure decreases the size of ZnO nanoparticles and affected their structure. Chapter" @default.
- W624022859 created "2016-06-24" @default.
- W624022859 creator A5032252669 @default.
- W624022859 date "2011-03-25" @default.
- W624022859 modified "2023-09-23" @default.
- W624022859 title "Fundamental studies on the synthesis dynamics of nanoparticles by laser ablation in pressurized water" @default.
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- W624022859 hasPublicationYear "2011" @default.
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