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通过低温电子断层扫描对新型单分散性半孔性二氧化纳米颗粒中的3D透气孔结构进行了洞察

Yidong Xia¹, Jianfang Liu², Rahul Kancharla³

¹Energy and Environment Science & Technology, Idaho National Laboratory Idaho Falls 83415 ID USA yidong.xia@inl.gov +01 208 526 7490.

Nanoscale advances

|June 1, 2023

概括

使用个人粒子冷传输电子断层扫描 (IPET) 进行合成中孔纳米粒子 (MSN) 的特征化,揭示它们的内部孔隙结构. 这种详细的形态对于理解储能和碳捕获的地质材料中的流体流动至关重要.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
地质化学地质化学

背景情况:

合成半孔纳米颗粒 (MSN) 是一种建筑地质材料,在地质地下储能和碳捕获方面具有潜在的应用.
准确地描述MSN的透孔对于预测流体流动和运输特性至关重要.
目前的方法在解决MSN中的细孔结构方面是有限的.

研究的目的:

开发和应用一种方法来详细3D表征50nm以下单分散的MSNs.
量化MSN内部的粒子内孔径分布和形态.
为在MSN基础上的地质材料中建模流体运输提供关键数据.

主要方法:

利用个体粒子冷传输电子断层扫描 (IPET) 来实现高分辨率的3D成像.
从断层扫描数据重建的3D密度图.
分析了MSN及其内部孔隙结构的形态和尺寸.

主要成果:

成功获得了单分散的MSN的详细3D形态,直径在35-46nm之间.
在MSN中确定了连接的粒子内部孔,直径为2-20nm (平均9.2 ±3nm).
观察到粒子内孔径大小与烧结MSN聚合物中的粒子间孔径大小相似.

结论:

IPET提供了前所未有的关于小MSN的3D结构的细节.
描述的孔隙结构是MSN地质材料中流体流动和运输的准确模拟的关键.
这项工作可以更好地设计基于MSN的材料,用于碳捕获和能源储存等环境应用.

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