Laser-Induced Explosive Vaporization of Liquids in Contact with a Solid Surface: Fundamental Studies and Applications

激光诱导液体与固体表面接触的爆炸汽化：基础研究和应用

• 批准号: 9317708
• 负责人: Costas Grigoropoulos
• 金额: $ 31.08万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317708&HistoricalAwards=false
• 关键词: Laser; Induced; Explosive; Vaporization; Liquids

ABSTRACT -- CTS-9317708 Grigoropoulos This proposal is concerned with novel science and important technological applications of the phenomenon of rapid nucleation and explosive vaporization of a liquid film in contact with a pulsed laser-heated surface. The science of the metastability behavior of superheated liquids is well established only in the near-steady-state regime at the millisecond time scale. In the much faster regime with a nanosecond time scale, superheated liquids may have different behavior, with regard to the possible superheating, bubble nucleation and growth kinetics, and the inhomogeneous nucleation process at a surface. Such behaviors in the fast regime have not been investigated until one recent study because traditional experimental techniques lack the speed and sensitivity. A recent study by the PI provides preliminary results on the nucleation and growth of bubbles in various liquids in contact with a pulse-laser-heated solid surface using a new simultaneous reflectance/scattering monitoring approach. Further quantitative experimentation and modeling are necessary for understanding the phase change phenomena involved. Significant applications of these pulse liquid film explosive vaporization phenomena in industry are possible. Practical implementation will be pursued with the goal of demonstrating manufacturing yield and productivity in a high-technology production environment. The first application is in the area of "laser cleaning" to remove micron and sub-micron particles from critical parts of modern electronic and data-storage devices. Other applications to be investigated include photo-acoustic pulse generation for nondestructive evaluation, enhanced laser-micromachining, and novel patterned-doping of surfaces.

摘要-- CTS-9317708 Grigoropoulos 该建议涉及与脉冲激光加热表面接触的液体膜的快速成核和爆炸性蒸发现象的新科学和重要技术应用。过热液体的亚稳态行为的科学仅在毫秒时间尺度的近稳态范围内得到很好的建立。 在具有纳秒时间尺度的快得多的制度中，过热液体可能具有不同的行为，关于可能的过热、气泡成核和生长动力学以及表面处的不均匀成核过程。由于传统的实验技术缺乏速度和灵敏度，直到最近的一项研究才对快速区域中的这种行为进行了研究。PI最近的一项研究提供了使用新的同时反射/散射监测方法在与脉冲激光加热固体表面接触的各种液体中气泡成核和生长的初步结果。进一步的定量实验和建模是必要的了解所涉及的相变现象。 这些脉冲液膜爆炸汽化现象在工业上有着重要的应用前景。 实际执行将追求的目标是证明在高科技生产环境中的制造产量和生产力。 第一个应用是在“激光清洁”领域，从现代电子和数据存储设备的关键部件中去除微米和亚微米颗粒。 其他应用进行调查，包括光声脉冲产生的无损评价，增强激光微加工，和新的图案化掺杂的表面。