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首页> 外文期刊>Microporous and mesoporous materials: The offical journal of the International Zeolite Association >A novel approach for advanced thermoporometry characterization of mesoporous solids: Transition kernels and the serially connected pore model
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A novel approach for advanced thermoporometry characterization of mesoporous solids: Transition kernels and the serially connected pore model

机译：介孔固体高温热压仪表征的一种新方法：过渡粒和串联孔模型

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摘要

Thermoporometry, namely revealing pore sizes based on the shifts of the freezing and melting transitions of liquid in the pores, has proven a powerful approach for mesostructure characterization of porous solids. Complementary to gas adsorption, it has several advantages, such as applicability to wet samples. At the same time, while gas sorption characterization has largely profited from the recent advances in the understanding of the gas-liquid phase equilibria in confined spaces, the solid-liquid transitions have remained poorly covered. In this work, in an analogy to the advanced gas sorption analysis, we implement a novel approach in thermoporometry by introducing the transition kernels, i.e. the families of solid-liquid transition curves describing different transition scenarios in single pores. In this way, a variation of the non-frozen layer thickness with temperature and the effects of thermodynamic fluctuations on phase transitions become automatically encoded in the transition kernels. As a next step, we incorporate these kernels into a recently developed theoretical framework, the serially-connected pore model, allowing for the analysis of pore networks beyond collections of independent pores conventionally assumed in the literature. This combination yields a substantial improvement of the accuracy of the thermoporometry method which is further demonstrated by applying NMR cryoporometry to MCM-41 and SBA-15 materials.
机译：热孔测量法，即基于孔中液体蒸馏和熔化过渡的差移，揭示孔隙尺寸，已经证明了多孔固体的培培素表征的强大方法。互补的气体吸附，它具有几个优点，例如适用于湿样品。同时，虽然气体吸附表征在很大程度上从近期理解狭窄空间中的气液相平衡的进步，但固液过渡仍然覆盖不良。在这项工作中，在对先进的气体吸附分析中，我们通过引入过渡核，即，在单孔中描述不同转换场景的固液转换曲线的家族来实现热压孔中的新方法。以这种方式，具有温度的非冷冻层厚度和热力学波动对相位转变的影响变化在转换核中自动编码。作为下一步，我们将这些内核纳入最近开发的理论框架，串联连接的孔模型，允许分析超越在文献中常规孔隙的集合之外的孔网络。该组合产生了通过将NMR啁啾致法施加至MCM-41和SBA-15材料进一步证明的热孔测定方法的准确性的大大提高。

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