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相关概念视频

Noble Gases02:54

Noble Gases


The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
The Periodic Table03:25

The Periodic Table

As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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相关实验视频

Updated: Jun 24, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

泽奥利特RHO型网带最轻的元素

Tao Wu1, Jian Zhang, Cong Zhou

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|April 16, 2009
PubMed
概括
此摘要是机器生成的。

两种新的金属有机共价框架 (MOCOF) 提供了最轻的烯RHO结构,由于其高度多孔和可访问的内部孔隙,显示出异常的二氧化碳储存能力.

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Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route
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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
07:13

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

Published on: November 15, 2016

相关实验视频

Last Updated: Jun 24, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route
08:26

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route

Published on: April 3, 2016

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
07:13

Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors

Published on: November 15, 2016

科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 化学 化学 化学

背景情况:

  • 金属有机框架 (MOF) 和共价有机框架 (COF) 是已建立的多孔材料.
  • 将MOF和COF整合到一个称为MOCOF的单一材料类中,为高级功能提供了新的机会.

研究的目的:

  • 报告两种新的,高度多孔的MOCOF的合成和特征.
  • 调查结构与物质的关系,特别关注孔隙性和气体储存能力.

主要方法:

  • 合成MOCOF材料使用特定的替代组在imidazolyl环上.
  • 孔隙结构,表面积和二氧化碳吸附能力的表征.

主要成果:

  • 合成了两种新的MOCOF,代表了已知最轻的烯RHO结构.
  • 这些材料具有很大的表面积 (1818 m2/g) 和高的二氧化碳储存能力 (35.6 cm3/g在760 Torr和273 K).
  • 合成证明了结构指导和毛孔收窄效应之间的成功平衡.

结论:

  • 开发的MOCOF具有独特的热带石RHO拓结构,具有高度可访问的孔隙.
  • 这些材料对二氧化碳捕获和储存应用具有重大潜力.