Takeya Satoshi, Muraoka Michihiro, Muromachi Sanehiro, Hyodo Kazuyuki, Yoneyama Akio
National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan.
Research Institute of Energy Frontier (RIEF), National Institute of Advanced Industrial Science and Technology (AIST), 16-1 Onogawa, Tsukuba 305-8569, Japan.
Phys Chem Chem Phys. 2020 Feb 14;22(6):3446-3454. doi: 10.1039/c9cp05983k. Epub 2020 Jan 27.
Nondestructive observations and characterization of low-density materials composed of low-Z elements, such as water or its related substances, are essential for materials and life sciences. However, visualizing these compounds and their phase changes is still challenging. In this study, an approach to X-ray imaging of water-related substances in heavy objects without the use of contrast agents is proposed. The implementation of the approach is based upon X-ray phase shift, in which the optimal photon energy is simulated for high-contrast X-ray imaging. Proof of concept is provided by observations of resins, water, and clathrate hydrates such as CO hydrate and tetrahydrofuran (THF) hydrate in an aluminum container by diffraction-enhanced X-ray imaging with synchrotron X-rays of 35 keV. These results suggest that the proposed approach is a unique method for visualizing the transformation of these clathrate hydrates and is also applicable to in situ observations of other objects composed of multiphase materials with small density differences.
对由低Z元素组成的低密度材料（如水或其相关物质）进行无损观察和表征，对材料科学和生命科学至关重要。然而，可视化这些化合物及其相变仍然具有挑战性。在本研究中，提出了一种在不使用造影剂的情况下对重物中的水相关物质进行X射线成像的方法。该方法的实施基于X射线相移，其中针对高对比度X射线成像模拟了最佳光子能量。通过使用35keV的同步加速器X射线进行衍射增强X射线成像，对铝容器中的树脂、水和笼形水合物（如CO水合物和四氢呋喃（THF）水合物）进行观察，提供了概念验证。这些结果表明，所提出的方法是可视化这些笼形水合物转变的独特方法，也适用于对由密度差异小的多相材料组成的其他物体进行原位观察。
