Micro-SAXS colloidal glasses February 2020

This archive contains the SAXS data acquired in February 2020 at the SAXS/WAXS beamline Australian Synchrotron by Amelia Liu, Stephen Mudie, Tim Petersen and Rico Tabor.The x-ray beam energy was 5.5 keV. The beam was defined using a near-field gold aperture (25 microns thick and 1.2 micron OD). The specimens were 20 micron thick layers of colloidal glasses composed of SiO2 microspheres (300 nm OD) and sandwiched between two Kapton layers 15 microns in thickness. A Kapton layer was used as the 20 micron spacer. The archive contains:Cropped micro-SAXS diffraction patterns (180x180) from spatio-temporal scans (148x21) in .tif format. Each pixel is 6.6e-5 Angstrom^-1. The spatio-temporal scans were conducted in 0.5 micron steps. Each line in the x-direction was scanned twice at an interval of 30 s to examine structural variations in each micro-volume with time. Files are named according to this convention 'dp_x_y_t.tif'. The first scan is denoted with t ='a' and the second with a t='b'. Diffraction patterns were collected using a Dectris - Pilatus 2M direct detection camera at a camera length of 7244 mm. A colloidal glass was scanned before and after a shear strain was applied by drawing a thin copper wire through the glass at a rate of approximately 0.1 mm/s and a distance of 0.2 mm. This would have induced a shear strain in the x-direction that varied linearly with distance from the wire.An area below the wire was scanned. Please see the file geometry.pdf to see the geometry of the applied strain with respect to the scan directions.Scanned areas were chosen where the glass thickness was homogeneous, visible fibres/dust etc could not be seen, and the beam intensity was stable.

本归档文件包含2020年2月由Amelia Liu、Stephen Mudie、Tim Petersen与Rico Tabor在澳大利亚同步辐射装置的小角X射线散射/广角X射线散射（SAXS/WAXS）光束线采集的小角X射线散射（SAXS）数据。实验所用X射线光束能量为5.5 keV，光束通过近场金孔径（厚度25微米，外径1.2微米）进行限束。实验样品为厚度20微米的胶体玻璃薄层，该胶体玻璃由外径300纳米的二氧化硅（SiO₂）微球构成，且被夹在两层厚度均为15微米的聚酰亚胺（Kapton）薄膜之间；另有一层聚酰亚胺薄膜用作20微米的间隔层。本归档文件包含以下内容：来自时空扫描（148×21）的裁剪后微区小角X射线散射衍射图像（尺寸180×180），格式为.tif；每个像素对应的散射矢量为6.6×10⁻⁵ 埃⁻¹。时空扫描以0.5微米的步距进行，X方向上的每条扫描线均以30秒的间隔重复扫描两次，用于观测每个微区体积内的结构随时间的变化情况。文件命名遵循'dp_x_y_t.tif'的规则：首次扫描的t值为'a'，第二次扫描的t值为'b'。衍射图像采用德科特里斯（Dectris）Pilatus 2M直接探测相机采集，相机长度（样品至探测器的距离）为7244毫米。实验中，先对一块胶体玻璃进行扫描，随后通过以约0.1毫米/秒的速率、0.2毫米的行程拉动细铜线穿过该胶体玻璃施加剪切应变，之后再次对其进行扫描。该操作会在X方向引入剪切应变，且应变大小与距铜线的距离呈线性关系。扫描区域选取于铜线下方，请参阅附件geometry.pdf文件，了解施加剪切应变后扫描方向与应变场的几何对应关系。所有扫描区域均满足以下条件：胶体玻璃厚度均匀、无可见纤维或灰尘等杂质，且光束强度稳定。