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相关概念视频

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Pozzolans

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Pozzolans are siliceous or aluminous materials blended with Portland cement. They interact with the calcium hydroxide produced during the hydration of Portland cement and contribute to improved strength and durability of concrete. The pozzolanic activity, a measure of a pozzolan's effectiveness, is typically assessed using the strength activity index, as defined in ASTM C 618-93, which calculates the ratio of the compressive strength of cement mixtures with and without pozzolan.
Fly ash is...
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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焦石的灵活性:起源,极限和评估

Sajjad Ghojavand1, Eddy Dib1, Svetlana Mintova1

  • 1Normandie Université, ENSICAEN, UNICAEN, CNRS, Laboratoire Catalyse et Spectrochimie (LCS) 14000 Caen France svetlana.mintova@ensicaen.fr.

Chemical science
|November 29, 2023
PubMed
概括
此摘要是机器生成的。

热带材料由于结合行为具有内在的灵活性,使得可调的吸附选择性成为可能. 了解和控制这种热带石的灵活性是设计先进吸附剂的关键.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 化学 化学 化学

背景情况:

  • 热带材料表现出显著的内在灵活性,这是由于Si-O和Al-O键的弹性质以及Si-O-Si和Al-O-Si角的扭曲.
  • 这种灵活性对于吸附选择性至关重要,但其起源和鱼性仍然难以理解.

研究的目的:

  • 为了探索热带石灵活性的起源.
  • 为了分类不同类型的热带石柔性.
  • 讨论实验评估中的挑战和选择性吸附剂设计的未来方向.

主要方法:

  • 文献综述和综合现有证据,以西奥利特的灵活性.
  • 热带石的灵活性分为由温度/压力引起的,由客体引起的和由构成引起的类别.
  • 讨论评估热带石灵活性时的实验挑战.

主要成果:

  • 岩的灵活性源于其框架键和角度的固有特性.
  • 灵活性可以由温度,压力,客分子和组成变化等外部因素引发.
  • 已经确定了三种主要类型的热带石灵活性.

结论:

  • 了解热带石的灵活性对于开发具有高吸附选择性的材料至关重要.
  • 克服评估热带石灵活性的实验挑战将使新型,定制吸附剂的设计成为可能.
  • 调整热的灵活性为先进的分离技术提供了一个有前途的途径.