Adsorption-Induced Deformation of Mesoporous Solids
Adsorption-Induced Deformation of Mesoporous Solids
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DOI：
10.1021/la1019247
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发表时间：
2010-08-17
期刊：
影响因子：
3.9
通讯作者：
Neimark, Alexander V.
中科院分区：
文献类型：
--
作者：
Gor, Gennady Yu.;Neimark, Alexander V.
采用Derjaguin-Broekholf-deBoer毛细凝聚理论描述了介孔固体在吸附-脱附滞后循环过程中的变形。我们提出了一个热力学模型，该模型涉及的机械应力引起的吸附相的吸附等温线。解析表达式推导的溶剂化压力的依赖性的蒸汽压。所提出的方法提供了一个描述的非单调滞后变形在毛细凝聚，而无需调用任何可调参数。以多孔玻璃和SBA-15二氧化硅吸附变形的文献实验数据为例，说明了该方法。
The Derjaguin-Broekholf-de Boer theory of capillary condensation is employed to describe deformation of mesoporous solids in the course of adsorption-desorption hysteretic cycles. We suggest a thermodynamic model, which relates the mechanical stress induced by the adsorbed phase to the adsorption isotherm. Analytical expressions are derived for the dependence of the solvation pressure on the vapor pressure. The proposed method provides a description of nonmonotonic hysteretic deformation during capillary condensation without invoking any adjustable parameters. The method is showcased drawing on the examples of literature experimental data on adsorption deformation of porous glass and SBA-15 silica.