Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Conformations of Ethane and Propane02:18

Conformations of Ethane and Propane

16.6K
In an organic molecule, free rotation about the carbon-carbon single bond results in energetically different conformers of the molecule. Due to this rotation, called the internal rotation, ethane has two major conformations — staggered and eclipsed.
Staggered conformation is a low energy and more stable conformation with the C-H bonds on the front carbon placed at 60°dihedral angles relative to the C-H bonds on the back carbon, leading to a reduced torsional strain. In staggered...
16.6K
Mass Spectrometry: Branched Alkane Fragmentation01:29

Mass Spectrometry: Branched Alkane Fragmentation

1.6K
This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
1.6K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

1.5K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.5K
Size-Exclusion Chromatography01:08

Size-Exclusion Chromatography

1.5K
In size-exclusion chromatography (SEC), also known as molecular-exclusion or gel-permeation chromatography, molecules are separated based on their sizes. This technique is important for separating large molecules such as polymers and biomolecules. The two classes of micron-sized stationary phases encountered in SEC are silica particles and cross-linked polymer resin beads. Both materials are porous, but their pore sizes vary significantly.
Silica particles offer advantages such as rigidity,...
1.5K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.4K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.4K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.1K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Metabolomics-driven insights into the multi-target antibacterial mechanisms of 2-methoxycinnamaldehyde against Bacillus cereus and its application in pork preservation.

Food microbiology·2026
Same author

Compositional Tunability and Framework-Charge Modulation in Pore-Space-Partitioned Metal-Organic Frameworks.

Inorganic chemistry·2026
Same author

Expanding the Ligand Scope of Pore-Space-Partitioned MOFs with a Chiral Camphorate Linker.

Inorganic chemistry·2026
Same author

Ligand-Symmetry-Driven Metal-Cluster Rotation for Accessing Compressed Pore Regimes in Metal-Organic Frameworks.

Journal of the American Chemical Society·2026
Same author

Echinatin from licorice exhibits antibacterial and anti-biofilm effects against Bacillus cereus: Mechanism and application in milk preservation.

International journal of food microbiology·2026
Same author

Rational Creation of the Second Xe-Matched Adsorption Site in a Covalent Organic Framework via a Digging-Patching Strategy for Simultaneously Boosting Xe Uptake and Xe/Kr Selectivity.

Journal of the American Chemical Society·2026

相关实验视频

Updated: Dec 30, 2025

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale
07:23

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale

Published on: August 2, 2018

8.0K

允许孔间隔离的异常乙吸收和乙选择性乙分离

Huajun Yang1,2, Yanxiang Wang2, Rajamani Krishna3

  • 1Department of Chemistry and Biochemistry , California State University , Long Beach , California 90840 , United States.

Journal of the American Chemical Society
|January 28, 2020
PubMed
概括

新的晶体多孔材料 (CPM) 与C2H6/C2H4分离的基准材料相比,具有显著更高的乙 (C2H6) 吸收能力. 这些强大的CPM显示了改善气体分离技术的前景.

更多相关视频

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

10.3K
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.7K

相关实验视频

Last Updated: Dec 30, 2025

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale
07:23

Experimental Study of the Relationship Between Particle Size and Methane Sorption Capacity in Shale

Published on: August 2, 2018

8.0K
Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
07:45

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

Published on: August 16, 2018

10.3K
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.7K

科学领域:

  • 材料科学
  • 化学工程
  • 分离科学

背景情况:

  • 在石化过程中,有效地将乙 (C2H6) 与乙烯 (C2H4) 分离至关重要.
  • 氧功能化MOF-74-Fe是C2H6/C2H4分离的基准材料,具有高选择性但中等的C2H6吸收能力 (74.3 cm3/g).
  • 理想的材料需要高的C2H6吸收能力和高的C2H6/C2H4选择性,这种组合仍然具有挑战性.

研究的目的:

  • 开发具有增强C2H6吸收能力的新型晶体多孔材料 (CPM),用于C2H6/C2H4分离.
  • 调查这些孔隙空间分隔的CPM的分离潜力和特性.
  • 探索可能超越现有基准性能的材料,如过氧MOF-74-Fe.

主要方法:

  • 一个孔隙空间分区的晶体多孔材料 (CPM) 的合成和特征.
  • 在1 atm和298 K时测量C2H6的吸收能力.
  • 对C2H6/C2H4选择性和同质吸附热的评估.
  • 评估热稳定性和水稳定性,再生能量和材料的可调性.

主要成果:

  • CPM的C2H6吸收能力高达166.8cm3/g,是过氧MOF-74-Fe的两倍多.
  • 这些CPM具有适度的C2H6/C2H4选择性 (高达1.75),但与基准相比,它们具有显著较低的异质吸附热量 (21.9-30.4kJ/mol).
  • 开发的CPM具有高热稳定性 (高达450°C),水稳定性,低再生能量和高鱼性.

结论:

  • 由于新开发的孔隙隔离CPM具有较高的C2H6吸收能力,因此为C2H6/C2H4分离提供了有前途的替代方案.
  • 虽然选择性还没有超过过氧MOF-74-Fe,但这些CPM的强度和可调性为工业应用带来了显著的优势.
  • 这些材料为设计选择性气体分离的先进吸附剂开辟了新的途径.