Influence of the Liquid Medium on the Stoichiometry and Magnetic Properties of Iron Nanoparticles Produced upon Femtosecond Laser Ablation

几乎所有的材料都可以用飞秒激光烧蚀的方法蒸发。在液体介质中，烧蚀材料结晶成直径约为10-100 nm的纳米颗粒，可以均匀地悬浮在液体中。铁基纳米粒子可以形成不同的结构(例如，核壳结构)或根据激光参数或液体环境的特性而改变其磁性。这使得铁基纳米颗粒变得有趣，例如在生物医学科学中的应用。在这个项目中，我们想要找出如何通过改变激光参数和产生颗粒的液体介质来控制纳米颗粒的尺寸分布、化学计量比和磁性。实验应该揭示，液体介质对纳米颗粒尺寸和化学组成的影响方式，激光参数的影响和液体介质的影响应该分开处理。

Almost all materials can be evaporated by means of femtosecond laser ablation. In a liquid medium the ablated material crystallises in nanoparticles of approximately 10-100 nm in diameter, which can be homogeneously suspended in the liquid. Iron-based nanoparticles may form different structures (e.g. core-shell structures) or vary their magnetic properties depending on the laser parameters or on the characteristics of the liquid environment. This makes the iron-based nanoparticles interesting e.g. for applications in biomedical science. In this project we want to find out how to control the size distribution, stoichiometry and magnetic properties of the nanoparticles by variation of laser parameters and the liquid medium, in which the particles are produced. Experiments should reveal, in which way the liquid medium influences the size and chemical composition of the nanoparticles, influences of the laser parameters and of the liquid media should be treated separately.