Comparative Gas Sorption and Cryoporometry Study of Mesoporous Glass Structure: Application of the Serially Connected Pore Model
Comparative Gas Sorption and Cryoporometry Study of Mesoporous Glass Structure: Application of the Serially Connected Pore Model
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DOI：
10.3389/fchem.2019.00230
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发表时间：
2019-04-16
影响因子：
5.5
通讯作者：
Valiullin, Rustem
中科院分区：
文献类型：
--
作者：
Enninful, Henry R. N. B.;Schneider, Daniel;Valiullin, Rustem
研究了不规则孔结构的小孔径介孔玻璃对氮气的吸附和水的融化冻结。采用最近发展的连续连通孔隙模型（SCPM）对实验数据进行分析。该模型通过在几何无序的介孔空间中引入成核和相生长机制之间的耦合，从本质上包含了结构无序。结果表明，与文献中流行的独立孔隙模型相比，SCPM不仅自一致地描述了边界过渡，而且还描述了整个扫描过渡族。扫描行为对多孔材料内部流体分布的微观细节非常敏感，因此可以用来检查热力学模型的有效性和改进结构分析。我们显示了极好的定量一致性之间的结构信息评估从低温测量和气体吸收数据使用SCPM。
Nitrogen sorption and melting and freezing of water in a small pore size mesoporous glass with irregular pore structure is studied. The analysis of the experimentally obtained data is performed using the recently developed serially connected pore model (SCPM). The model intrinsically incorporates structural disorder by introducing coupling between nucleation and phase growthmechanisms in geometrically disorderedmesopore spaces. It is shown that, in contrast to the independent pore models prevailing in the literature, SCPM self-consistently describes not only boundary transitions, but also the entire family of the scanning transitions. The scanning behavior is shown to be very sensitive to microscopic details of the fl uid phase distribution within the porous materials, hence can be used to check the validity of the thermodynamic models and to improve the structural analysis. We show excellent quantitative agreement between the structural information evaluated from the cryoporometry and gas sorption data using SCPM.