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arXiv 1507.01252cond-mat.soft
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孔长和孔几何形状在吸附/脱附过程中的重要性:分子模拟研究

Importance of pore length and geometry in the adsorption/desorption process: a molecular simulation study

M. A. Balderas Altamirano, S. Cordero, R. López-Esparza, E. Pérez, A. Gama Goicochea

摘要:

离散势能很好地描述气液边界,这对于用计算机模拟气体分子在介孔体系中的吸附是必要的。虽然在这方面已经有了一些工作,但是仿真仍然是非常耗时的.在这里,我们表明,一个有效的替代方案是使用三维伊辛模型,它允许一个模型的大型系统,几何形状复杂的要求,准确地代表液体蒸汽边界。特别是,我们报告两种不同的几何形状的圆柱形孔的分子模拟,使用离散的潜力。详细研究了有限长孔和无限长孔的滞回线中孔长的影响。最后,我们将我们的预测与实验结果进行比较,发现有限孔的滞后回线预测的面积与吸附/解吸实验中发现的面积之间具有很好的一致性。

英文摘要:

Discrete potentials can describe properly the liquid vapor boundary that is necessary to model the adsorption of gas molecules in mesoporous systems with computer simulations. Although there are some works in this subject, the simulations are still highly time - consuming. Here we show that an efficient alternative is to use the three - dimensional Ising model, which allows one to model large systems, with geometries as complex as required that accurately represent the liquid vapor boundary. In particular, we report molecular simulations of cylindrical pores of two different geometry, using a discrete potential. The effect of the length of the pore in the hysteresis loop for a finite pore and infinite one is studied in detail. Lastly, we compare our predictions with experimental results and find excellent agreement between the area of the hysteresis loop predicted for the finite pore and that found in adsorption/desorption experiments.

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