Vorobiev Alexei, Paracini Nicolò, Cárdenas Marité, Wolff Max
Department for Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, 75120, Uppsala, Sweden.
Institute Laue-Langevin, 71 rue des martyrs, 38042, Grenoble, France.
Sci Rep. 2021 Sep 7;11(1):17786. doi: 10.1038/s41598-021-97112-x.
We have performed grazing incidence neutron small angle scattering using a fan shaped incident beam focused along one dimension. This allows significantly reduced counting times for measurements of lateral correlations parallel to an interface or in a thin film where limited depth resolution is required. We resolve the structure factor of iron inclusions in aluminium oxide and show that the ordering of silica particles deposited on a silicon substrate depends on their size. We report hexagonal packing for 50 nm but not for 200 nm silica spheres deposited by a modified Langmuir-Schaefer method on a silicon substrate. For the 200 nm particles we extract the particles shape from the form factor. Moreover, we report dense packing of the particles spread on a free water surface. We name this method π-GISANS to highlight that it differs from GISANS as it gives lateral information while averaging the in-depth structure.
我们使用沿一维聚焦的扇形入射束进行掠入射中子小角散射。这使得在测量与界面平行或在需要有限深度分辨率的薄膜中的横向相关性时，计数时间显著减少。我们解析了氧化铝中铁杂质的结构因子，并表明沉积在硅衬底上的二氧化硅颗粒的排列取决于它们的尺寸。我们报告了通过改进的朗缪尔 - 谢弗方法沉积在硅衬底上的50纳米二氧化硅球体呈六方堆积，但200纳米的二氧化硅球体并非如此。对于200纳米的颗粒，我们从形状因子中提取颗粒形状。此外，我们报告了在自由水表面上扩散的颗粒的致密堆积。我们将此方法命名为π - GISANS，以突出它与GISANS的不同，因为它在平均深度结构的同时给出横向信息。
