Altakroury Abdel Rahman, Gatsa Oleksandr, Riahi Farbod, Fu Zongwen, Flimelová Miroslava, Samokhvalov Andrei, Barcikowski Stephan, Doñate-Buendía Carlos, Bulgakov Alexander V, Gökce Bilal
Chair of Materials Science and Additive Manufacturing, School of Mechanical Engineering and Safety Engineering, University of Wuppertal, 42119 Wuppertal, Germany.
HiLASE Centre, FZU - Institute of Physics of the Czech Academy of Sciences, Za Radnicí 828, 25241 Dolní Břežany, Czech Republic.
Beilstein J Nanotechnol. 2025 Mar 25;16:407-417. doi: 10.3762/bjnano.16.31. eCollection 2025.
The potential to modify the size distribution of nanoparticles synthesized by pulsed laser ablation in liquids is demonstrated using a donut-shaped laser beam. In experiments on pulsed laser ablation in water of gold, yttrium oxide, and high-entropy alloy targets with both Gaussian and donut-shaped beams, we observed a significant reduction in particle size, narrowing of the size distribution width, and an improvement in sphericity when utilizing the donut-shaped laser beam. We performed time-resolved shadowgraph imaging of the laser-induced cavitation bubble, revealing a toroidal structure that overruns the ring-shaped ablation site, compared to the quasi-hemispherical bubble covering the ablation spot produced by the Gaussian beam. Based on this pioneering study, further investigation with higher temporal and spatial resolution are warranted.
利用环形激光束证明了改变液体中脉冲激光烧蚀合成的纳米颗粒尺寸分布的潜力。在使用高斯光束和环形光束对金、氧化钇和高熵合金靶材在水中进行脉冲激光烧蚀的实验中，我们观察到当使用环形激光束时，颗粒尺寸显著减小，尺寸分布宽度变窄，球形度提高。我们对激光诱导的空化气泡进行了时间分辨阴影成像，发现与高斯光束产生的覆盖烧蚀点的准半球形气泡相比，空化气泡呈现出一种超越环形烧蚀部位的环形结构。基于这项开创性研究，有必要进行更高时间和空间分辨率的进一步研究。
