Selective formation of only one iron oxide phase is a major challenge in conventional laser ablation process, as is scaling up the process. Herein, superparamagnetic single-phase magnetite nanoparticles of hexagonal and spheroidal-shape, with an average size of ca. 15 nm, are generated by laser ablation of bulk iron metal at 1064 nm in a vortex fluidic device (VFD). This is a one-step continuous flow process, in air at ambient pressure, with in situ uptake of the nanoparticles in the dynamic thin film of water in the VFD. The process minimizes the generation of waste by avoiding the need for any chemicals or surfactants and avoids time-consuming purification steps in reducing any negative impact of the processing on the environment.

中文翻译：

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水流下激光烧蚀涡流介导合成超顺磁性磁铁矿纳米颗粒

仅选择性形成一种氧化铁相是传统激光烧蚀工艺中的一个主要挑战，扩大工艺规模也是如此。在此，超顺磁性单相磁铁矿纳米颗粒呈六边形和球形，平均尺寸约为。15 nm 是通过在涡流流体装置 (VFD) 中以 1064 nm 激光烧蚀大块铁金属而产生的。这是一种单步连续流动过程，在环境压力下的空气中，纳米颗粒在 VFD 中的动态水薄膜中原位吸收。该工艺无需使用任何化学品或表面活性剂，从而最大限度地减少废物的产生，并避免耗时的纯化步骤，从而减少加工对环境的负面影响。