Dynamics of formation and decay of supercritical fluid silver colloid under pulse laser ablation conditionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 сентября 2019 г.
Аннотация:The effect of the density of supercritical carbon dioxide (SC-CO2) on the dynamics of formation of supercritical fluid (SCF) silver colloids during pulse laser ablation and their post-pulse degradation was studied by in situ UV/vis absorption spectroscopy. Laser irradiation of a silver target in SC-CO2 caused ablative formation of Ag nanoparticles of different shapes and sizes: quasi-spherical particles (similar to 4 nm) and larger Ag nanoparticles (hundreds of nanometers). A change in the colloid density from 0.24 to 0.82 g/cm(3) caused significant changes in the dynamics of ablative formation of large and small particles, the rate of aggregation of small Ag particles into large particles, and the rate of gravitation-induced sedimentation of nanoparticles in the SCF colloid.