Joint Institute for High Temperatures RAS, Izhorskaya 13 Bldg 2, Moscow 125412, Russia.
Phys Chem Chem Phys. 2013 Mar 7;15(9):3108-14. doi: 10.1039/c2cp42650a. Epub 2013 Jan 15.
Laser ablation in liquids is now commonly used to produce colloidal nanoparticles (NPs) that have found numerous applications in different areas. In experiments, NPs of different materials can be rather easily obtained by using laser systems with various pulse durations, shapes, wavelengths, and fluences. In this paper, we focus our attention on metal (gold) NPs produced by ultra-short laser pulses. To better understand the mechanisms of the NPs formation, we perform modeling of femtosecond laser interactions with a gold target in the presence of liquid (water). Simulation of the ablation process over several nanoseconds shows that most of the primary NPs originate from the ablated metastable liquid layer, whereas only a minority is formed by condensation inside the cavitation bubble. These particles will further grow/evaporate, and coagulate during a much longer collision stage in the liquid colloid.
激光烧蚀在液体中现在被广泛用于生产胶体纳米粒子（NPs），这些粒子在不同领域有很多应用。在实验中，通过使用具有不同脉冲持续时间、形状、波长和强度的激光系统，可以很容易地获得不同材料的 NPs。在本文中，我们将注意力集中在由超短激光脉冲产生的金属（金）NPs 上。为了更好地理解 NPs 形成的机制，我们对飞秒激光与存在液体（水）时的金靶的相互作用进行了建模。对纳秒级的烧蚀过程进行模拟表明，大多数初生 NPs 来源于烧蚀的亚稳液态层，而只有少数是由空化泡内的冷凝形成的。这些颗粒将在液体胶体的更长碰撞阶段进一步生长/蒸发和凝聚。
