Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, PO 3640, D-76021 Karlsruhe, Germany.
University of Duisburg-Essen, Technical Chemistry I and Center of Nanointegration Duisburg-Essen (CENIDE), Universitaetsstrasse 7, D-45141 Essen, Germany.
J Colloid Interface Sci. 2017 Mar 1;489:106-113. doi: 10.1016/j.jcis.2016.08.030. Epub 2016 Aug 12.
Pulsed laser ablation in liquids (PLAL) is a multiscale process, involving multiple mutually interacting phenomena. In order to synthesize nanoparticles with well-defined properties it is important to understand the dynamics of the underlying structure evolution. We use visible-light stroboscopic imaging and X-ray radiography to investigate the dynamics occurring during PLAL of silver and gold on a macroscopic scale, whilst X-ray small angle scattering is utilized to deepen the understanding on particle genesis. By comparing our results with earlier reports we can elucidate the role of the cavitation bubble. We find that symmetry breaking at the liquid-solid interface is a critical factor for bubble motion and that the bubble motion acts on the particle distribution as confinement and retraction force to create secondary agglomerates.
脉冲激光烧蚀在液体中（PLAL）是一个多尺度的过程，涉及多个相互作用的现象。为了合成具有良好定义性质的纳米粒子，了解基础结构演化的动力学是很重要的。我们使用可见光频闪成像和 X 射线射线照相术在宏观尺度上研究 PLAL 过程中发生的动力学，同时利用 X 射线小角散射来加深对颗粒成因的理解。通过将我们的结果与早期的报告进行比较，我们可以阐明空化泡的作用。我们发现，液体-固体界面的对称破缺是气泡运动的关键因素，并且气泡运动作为约束和缩回力作用于颗粒分布，以形成二次团聚体。
