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Analyte Adsorption and Distribution01:09

Analyte Adsorption and Distribution

611
In certain chromatographic separations, solutes transfer between the mobile phase and the stationary phase via sorption, which typically refers to the process of adsorption. For many chromatographic systems, the sorption process often depends on the polarity of the compounds—an expression of the overall dipole moment within the molecule. During the separation process, there is competition between the solute and solvent for adsorption to the stationary phase. Highly polar compounds and...
611

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开发和应用一个先进的透模型,以通过物理吸附来表征毛孔网络.

Jakob Söllner1, Alexander V Neimark2, Matthias Thommes1

  • 1Institute of Thermal Separation Science (TVT), Department of Chemical and Biochemical Engineering Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 91058 Erlangen, Bavaria, Germany.

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概括

一个新的孔状网络模型通过准确模拟吸附-脱附等热体来增强纳米孔状材料的纹理特征. 这种方法为分离和储存中的应用提供了对孔隙结构和乱的更深入的了解.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理化学 物理化学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 物理吸附对于描述多孔材料,评估微孔和中孔的特性至关重要.
  • 描述无序和层次结构的多孔材料存在持续的挑战.
  • 现有的方法难以应对这种材料中吸附歇斯底里的复杂性.

研究的目的:

  • 引入一种新的孔状网络模型,用于增强纳米孔状材料的纹理特征.
  • 为了提供一个统一的框架来建模整个吸附-脱吸异温,包括歇斯底里.
  • 提供对毛孔网络特征和混乱的影响更深入的见解.

主要方法:

  • 在有限大小的Bethe格子上,基于透理论的孔隙网络模型的开发.
  • 包括所有已知的机制,有助于吸附歇斯底里 (凝结,蒸发,孔隙阻塞,化).
  • 将模型与非局部密度函数理论 (NL-DFT) 内核相结合,用于全面的异热模拟.

主要成果:

  • 该模型成功模拟了各种二氧化材料的吸附-脱吸异热和歇斯底里斯扫描.
  • 对有序和无序的半孔二氧化计算和实验等温度之间的准确相关性.
  • 确定关键的毛孔网络特征,如连接性,毛孔大小分布和乱影响.

结论:

  • 新型网络模型为纳米孔状材料提供了多功能和丰富的纹理洞察力.
  • 它使以前无法获得的全面表征成为可能,进步了该领域.
  • 该模型可以指导多孔材料的设计,用于分离,催化和储存的应用.