激光照射纳米粒子的成核空化

C. Farny, Tianmin Wu, R. G. Holt, T. Murray, Ronald A. Roy
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引用次数: 87

摘要

研究了激光照射金纳米粒子产生蒸汽泡作为高强度聚焦超声(HIFU)诱导空化的成核点。532 nm Nd:Yag激光器的脉冲与直径为82 nm金颗粒的丙烯酰胺模体中的1.1 mhz脉冲HIFU源同步。在激光脉冲能量为0.10 mJ、HIFU焦点压力为0.92 MPa时,利用15 mhz聚焦换能器检测气泡破裂产生的辐射。相比之下,在没有激光照射的情况下,HIFU需要4.50 MPa的峰值焦压才能形成可检测的空化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Nucleating cavitation from laser-illuminated nano-particles
Vapor bubble generation from laser-illuminated gold nano-particles has been investigated as a means of providing nucleation sites for cavitation induced by high-intensity focused ultrasound (HIFU). Pulses from a 532-nm Nd:Yag laser were synchronized with a pulsed 1.1-MHz HIFU source in an acrylamide phantom seeded with 82-nm-diameter gold particles. Emissions from bubble collapses were detected by a 15-MHz focused transducer at a laser pulse energy and HIFU focal pressure of 0.10 mJ and 0.92 MPa, respectively. In comparison, a HIFU peak focal pressure of 4.50 MPa was required to nucleate detectable cavitation without laser illumination.
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