A new framework for X-ray photon correlation spectroscopy analysis from polycrystalline materials
A new framework for X-ray photon correlation spectroscopy analysis from polycrystalline materials
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DOI：
10.1063/1.5051451
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发表时间：
2018-12-01
影响因子：
1.6
通讯作者：
Bates, Frank S.
中科院分区：
文献类型：
--
作者：
Lewis, Ronald M., III;Jackson, Grayson L.;Bates, Frank S.
我们报告了一种新的分析框架，用于解释多晶材料的x射线光子相关光谱测量数据，其特征是在固定波长量级（即各向异性散射）下具有强散射强度变化。目前，还没有一种解析方法可以解释这类材料的随时间变化的各向异性散射。应用该框架研究了有序-无序过渡下球形胶束形成双嵌段共聚物熔体的动力学，其中胶束体心立方结构的有限尺寸晶粒产生各向异性散射。从简单的测量中恢复了丰富的分析信息，包括与颗粒内胶束相关的弛豫时间和速度的分布。本研究的结果证明了这种新的分析方法的有效性，它可以很容易地适用于各种材料和系统。AIP出版社出版。
We report a new analytical framework for interpreting data from X-ray photon correlation spectroscopy measurements on polycrystalline materials characterized by strong scattering intensity variations at fixed wavevector magnitude (i.e., anisotropic scattering). Currently, no analytical method exists for the interpretation of the time-dependent anisotropic scattering from such materials. The framework is applied to interrogate the dynamics of a spherical micelle-forming diblock copolymer melt below the order-disorder transition, wherein finite size grains of a micellar body-centered cubic structure produce anisotropic scattering. A wealth of analytical information is recovered from a simple measurement, including distributions of relaxation times and speeds associated with micelles within grains. The findings of this study demonstrate the efficacy of this new analytical method, which may be readily adapted for application to a variety of materials and systems. Published by AIP Publishing.