Vakili Mohammad, Vasireddi Ramakrishna, Gwozdz Paul V, Monteiro Diana C F, Heymann Michael, Blick Robert H, Trebbin Martin
Centre for Ultrafast Imaging (CUI), University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Center for Hybrid Nanostructures (CHyN), University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany.
Rev Sci Instrum. 2020 Aug 1;91(8):085108. doi: 10.1063/5.0012806.
Free liquid jets are a common sample delivery method in serial femtosecond x-ray (SFX) crystallography. Gas dynamic virtual nozzles (GDVNs) use an outer gas stream to focus a liquid jet down to a few micrometers in diameter. Such nozzles can be fabricated through various methods (capillary grinding, soft lithography, digital light processing, and two-photon polymerization) and materials, such as glass, polydimethylsiloxane, and photosensitive polyacrylates. Here, we present a broadly accessible, rapid prototyping laser ablation approach to micromachine solvent-resistant and inert Kapton polyimide foils with highly reproducible geometric features that result in 3D flow-focused GDVNs suitable for crystallography experiments at synchrotrons and free-electron laser facilities.
自由液体射流是串行飞秒X射线（SFX）晶体学中一种常见的样品输送方法。气体动力学虚拟喷嘴（GDVN）利用外部气流将液体射流聚焦到直径几微米的尺寸。这种喷嘴可以通过各种方法（毛细管研磨、软光刻、数字光处理和双光子聚合）以及玻璃、聚二甲基硅氧烷和光敏聚丙烯酸酯等材料制造。在此，我们提出一种广泛适用的快速成型激光烧蚀方法，用于微加工具有高度可重复几何特征的耐溶剂和惰性聚酰亚胺箔，从而制造出适用于同步加速器和自由电子激光设施晶体学实验的三维流动聚焦GDVN。
