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相关概念视频

Adsorption of Gases on Solids01:28

Adsorption of Gases on Solids

219
Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
219
Adsorption Isotherms II01:25

Adsorption Isotherms II

111
Brunauer, Emmett, and Teller (BET) introduced a theory in 1938 that modified Langmuir's assumptions to explain multilayer physical adsorption. This theory is applicable to Type II isotherms and provides a more realistic picture of adsorption processes. The BET theory assumes a uniform solid surface with localized adsorption sites, where adsorption at one site doesn't affect adsorption at neighboring sites. This theory also allows for the possibility of additional molecules being adsorbed on top...
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用于气体吸附和分离的灵活的微孔有机框架

Hailong Wang1, Bin Li1, Hui Wu

  • 1†Department of Chemistry, University of Texas at San Antonio, San Antonio, Texas 78249-0698, United States.

Journal of the American Chemical Society
|July 28, 2015
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概括

一个新的结有机框架 (HOF-5) 显示了灵活性和高透性. 由于其独特的孔隙结构,这种材料在环境条件下有效地捕获二氧化碳和乙.

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科学领域:

  • 材料科学
  • 化学学
  • 纳米技术

背景情况:

  • 带有结的有机框架 (HOF) 是一种具有调节性质的多孔材料.
  • 开发具有增强气体吸附能力的新型HOF对于气体储存和分离的应用至关重要.

研究的目的:

  • 使用新型有机链接器构建和描述一个新的三维HOF (HOF-5).
  • 研究激活HOF-5a的气体吸附特性,特别是二氧化碳和乙.

主要方法:

  • 使用 4,4',4′′,4′′'-tetra(2,4-diamino-1,3,5-triazin-6-yl) tetraphenylethene 的方法合成HOF-5.
  • 粉末X射线衍射 (PXRD) 用于结构分析和框架收缩的确定.
  • 在77K的 (N2) 吸附-脱附等温器中,以评估孔隙性和表面积 (BET).
  • 粉末中子衍射和理论计算以阐明气体封装机制.

主要成果:

  • HOF-5被成功合成并激活为HOF-5a,体积显著收缩约21%.
  • 激活的HOF-5a显示了一个Brunauer-Emmett-Teller (BET) 的表面积为1101 m2/g.
  • HOF-5a显示了阶段性N2吸附等温,表明了框架的灵活性.
  • 在环境条件下观察到大量的乙和二氧化碳.
  • 粉末中子衍射和理论计算证实了二氧化碳在毛孔中的伪一维阵列中的封装.

结论:

  • HOF-5a是一种灵活,多孔的材料,具有储气应用的潜力.
  • 由于HOF-5a具有独特的孔隙特性,可以有效捕获二氧化碳和乙.
  • 这项研究强调了针对性气体吸附的HOF的结构性质关系.