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描述水与纳米孔材料相互作用的行为:在本地环境中使用磁共振方法进行结构性调查

Kai Ye^1,2, Sze Yuet Chin¹, Nicole Lin Xi²

¹Center of High Field NMR Spectroscopy and Imaging, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore.

Chemphyschem : a European journal of chemical physics and physical chemistry

|May 6, 2024

概括

这项研究使用MRI和NMR分析纳米孔状玻璃中的水,揭示孔径大小和水封闭差异. 使用偏磁探头的新液相方法为基于气体的孔径大小分析提供了替代方案.

科学领域:

材料科学材料科学材料科学
化学化学化学
物理物理学物理

背景情况:

液体吸收到纳米孔状材料是跨学科至关重要的.
现有的表征方法经常面临局限性和潜在的误解.
了解水纳米孔相互作用是材料设计和应用的关键.

研究的目的:

为了研究水的吸收和限制在纳米孔状玻璃中.
开发和应用用于液相分析的先进表征技术.
在本地潮湿环境中确定毛孔尺寸和瓶尺寸.

主要方法:

结合磁共振成像 (MRI) 和神奇角度旋转核磁共振 (MAS NMR).
使用MRI对水面积的定量分析.
使用MAS NMR的酸盐框架和水封闭的结构特征.
测试参磁探针扩散实验,以评估孔隙瓶.
孔径大小推导使用磁性探针大小,密度函数理论 (DFT) 模拟和标准样品表征.

主要成果:

磁力共振成像提供了定量水域范围数据.
MAS NMR揭示了酸盐结构信息,交互式表面积和框架包装.
对水旋转-旋转放松时间 (T2) 的分析表明水的限制有所变化.
参磁探头实验成功量化了孔隙瓶尺寸.
衍生出的孔径 (<1.3 nm) 与布鲁纳uer-Emmett-Teller (BET) 分析一致.

结论:

综合MRI和MAS NMR为水-纳米孔材料相互作用提供了全面的见解.
偏磁探针扩散为孔径大小表征提供了一种新的液相方法.
这种方法可以替代传统的基于气体的技术,如BET分析.

关键词:

在MAS-NMR的研究中,MAS-NMR 这就是为什么MRI是MRI.封闭式流体的封闭式流体纳米孔纳米孔纳米孔

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