Mechanisms of Nanoparticle Generation by Laser Ablation of Thin Films in Liquids

液体中激光烧蚀薄膜产生纳米粒子的机制

• 批准号: 1301298
• 负责人: Leonid Zhigilei
• 金额: $ 25.51万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-06-01 至 2017-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1301298&HistoricalAwards=false
• 关键词: Mechanisms; Nanoparticle; Generation; Laser; Ablation

This grant will support a well-integrated collaborative experimental ? computational study of the mechanisms of nanoparticle generation in short pulse laser ablation of thin metal films and multi-layers in a liquid environment. The key processes that control the generation of nanoparticles will be investigated in large-scale atomistic simulations and experiments performed for thin film targets embedded in common liquids, such as water, acetone, and toluene, and irradiated by short (femtosecond to nanosecond) laser pulses. The detailed microscopic information on highly non-equilibrium processes of laser ablation and nanoparticle formation, revealed in the simulations, will be used to guide the experimental exploration of conditions that ensure fine control over the nanoparticle size distribution, structure and composition. The role of the spatial confinement of the deposited laser energy within the irradiated films and the interaction of the ejected ablation plume with liquid environment are among the key questions to be investigated computationally and in experiments.The results of this study will provide guidance for the design of experimental setups optimized for the generation of nanoparticles with structure and composition meeting the needs of particular applications. This will enable individual researchers to produce nanoparticles for their research projects that are not readily available commercially, or if they are, at a great cost. The generation of nanoparticles with a narrow size distribution and free of contaminants has a good potential to impact many applications, including biomedical research, nanoengineering of advanced materials, optoelectronics, and surface catalysis. The close interaction between Rutgers-Camden, a predominantly undergraduate institution, and the University of Virginia, a research-oriented institution, will provide unique educational opportunities to a diverse group of undergraduate and graduate students.

这笔赠款将支持一个良好的综合合作实验？在液体环境中短脉冲激光烧蚀薄金属膜和多层膜中纳米颗粒产生机制的计算研究。 控制纳米颗粒生成的关键过程将在大规模原子模拟和实验中进行研究，这些实验是针对嵌入在常见液体（如水，丙酮和甲苯）中的薄膜目标，并通过短（飞秒至纳秒）激光脉冲进行照射。 在模拟中揭示的激光烧蚀和纳米颗粒形成的高度非平衡过程的详细微观信息将用于指导实验探索，以确保对纳米颗粒尺寸分布，结构和组成的精细控制。沉积的激光能量在辐照薄膜中的空间限制作用以及喷射的烧蚀羽流与液体环境的相互作用是计算和实验研究的关键问题之一，本研究的结果将为优化实验装置的设计提供指导，以产生满足特定应用需求的结构和成分的纳米颗粒。这将使个别研究人员能够为他们的研究项目生产纳米粒子，这些纳米粒子不容易在商业上获得，或者如果可以的话，成本很高。具有窄尺寸分布和无污染物的纳米颗粒的产生具有很好的潜力来影响许多应用，包括生物医学研究、先进材料的纳米工程、光电子学和表面催化。罗格斯-卡姆登大学是一所以本科为主的大学，弗吉尼亚大学是一所以研究为导向的大学，两者之间的密切互动将为不同的本科生和研究生群体提供独特的教育机会。