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使用X射线微分动态放射 (XDDR) 在完全不透明的多孔网络中探测粒子动态

P Levitz¹, L Michot¹, N Malikova¹

¹PHENIX Laboratory, Sorbonne Université and CNRS, Paris 75252, France. pierre.levitz@sorbonne-universite.fr.

|March 31, 2025

概括

研究人员开发了X射线差异动态放射 (XDDR) 来追踪不透明多孔介质中的粒子运动. 这种新的方法量化了粒子动态,克服了光学显微镜对土壤等材料的局限性.

科学领域:

软物质物理学软物质物理学
材料科学材料科学材料科学
非侵入性成像技术非侵入性成像技术

背景情况:

追踪多孔介质中的粒子动态对于理解土壤等材料中的现象至关重要.
目前的光学显微镜方法仅限于透明样本,不包括许多自然存在的不透明介质.
需要一种新的技术来探测不透明,复杂的环境中的粒子运动.

研究的目的:

引入和验证X射线微分动态放射 (XDDR) 作为一种分析不透明多孔介质中的粒子动态的方法.
为了证明XDDR在定量确定粒子中介散射函数 (ISF) 的能力.
为了比较XDDR的性能与现有的技术,如微分动态显微镜 (DDM) 和X射线光子相关谱 (XPCS).

主要方法:

在纯吸收模式下记录时间演变的X射线放射图.
分析X射线数据以提取粒子运动的定量信息.
模拟在多孔网络中的合体的随机走动力学,并对水和PMMA球体中的颗粒进行实验.

主要成果:

在不透明的多孔介质中,XDDR成功量化了粒子动态,包括沉积.
该方法通过对微米大小的二氧化颗粒进行模拟和实验来验证.
XDDR覆盖了广泛的时间尺度 (0.2微秒到几分钟) 和q范围 (0.1到5微米-1),弥合了DDM和XPCS之间的差距.

结论:

XDDR是一种强大的,非侵入性的技术,用于研究不透明的多孔材料中的粒子动态.
这种方法显著扩大了动态光散射技术的范围,以以前无法访问的样本类型.
XDDR提供了一种独特的功能,可以在各种不透明系统中探测微观粒子运动.

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