PHYSICO-CHEMICAL DYNAMICS OF NANOPARTICLE FORMATION DURING LASER DECONTAMINATION AND CHARACTERIZATION

Cheng, Meng-Dawn

Oak Ridge National Laboratory

关键词: Acceleration;    Aerosols;    Decontamination;    Computerized Simulation;    Ablation;   

DOI  :  10.2172/835402
RP-ID  :  EMSP-82807-2002
RP-ID  :  835402

美国|英语

来源: UNT Digital Library

【 摘 要 】

Improvement of understanding on nanoparticle production during simultaneous laser-based decontamination and characterization is imperative to the acceleration of decommission and deactivation (D&D) missions of US Department of Energy (DOE). Many researchers, mostly in material research, have explored issues related to aerosol particle formation by laser ablation, but there are little data relevant to D&D. Nanoparticles are harmful to D&D workers and the environment. The formation, properties, growth and transport mechanisms of radionuclides and toxic metals--laden nanoparticles are little known. The focus of this research is to investigate the effects of the laser parameters and the chemistry of target samples (contaminated and uncontaminated) on the dynamics and properties of produced particles. Data will facilitate better design of pollution control strategies. There are three goals associated with achieving the required understanding of nanoparticle dynamics. (1) To develop baseline property data of laser-produced nanoparticles from samples of different bulk chemical composition and surface morphology. The data would include properties of particles such as the size, shape, distribution, and chemical composition. (2) To develop advanced particle instrumentation (for sizing and chemistry measurement) so that reliable data can be obtained in higher resolution and shorter interval to delineate the dynamics, and (3) To employ an advanced computer simulation model to analyze and/or predict the dynamics of particles produced.