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Low Pressure Hysteresis in Materials with Narrow Slit Pores

机译：窄缝孔材料中的低压滞后

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Humidity-dependent closing and reopening slit pores can produce hysteresis loops in sorption diagrams even at low relative vapor pressure. Pore closing is supported by adhesion of the slit wall surfaces. In a macroscopic model for sorption hysteresis in narrow slits, the adhesion energy jumps by a finite value when touching slit walls are separated from each other. We consider a more realistic adhesion model by introducing a smoothly-varying adhesion force, which depends on the distance between the slit walls. The range of the attraction between the slit walls is found to have a pronounced influence on the shape of hysteresis loops at low vapor pressure. A large interaction range avoids an extraordinarily small relative vapor pressure necessary for pore closing, which is a precondition for low pressure hysteresis. Our extended model allows us to describe a discontinuity, which can appear in the desorption branch of swelling/shrinkage diagrams for hardened cement paste.
机译：即使在较低的相对蒸气压下，取决于湿度的关闭和重新打开的缝隙孔也会在吸附图中产生磁滞回线。缝隙壁表面的粘着力支持孔的闭合。在窄缝隙中的吸附滞后的宏观模型中，当接触缝隙的壁彼此分开时，粘附能跃升一个有限值。我们通过引入平滑变化的粘附力来考虑更现实的粘附模型，该粘附力取决于缝隙壁之间的距离。发现狭缝壁之间的吸引力范围对低蒸气压下的磁滞回线的形状具有显着影响。大的相互作用范围避免了孔闭合所需的非常小的相对蒸气压，这是低压滞后的前提。我们的扩展模型允许我们描述不连续性，该不连续性可能出现在硬化水泥浆的溶胀/收缩图的解吸分支中。

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