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相关概念视频

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.8K

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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures
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为什么碳纳米管会生长

Li Ping Ding1,2, Ben McLean1, Ziwei Xu3

  • 1Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS), Ulsan 44919, Republic of Korea.

Journal of the American Chemical Society
|March 17, 2022
PubMed
概括
此摘要是机器生成的。

碳纳米管 (CNT) 的生长是因为它们的催化剂接口能量在石墨盖上升时显著下降. 这克服了粘附,推动了这些必需的纳米材料的生长.

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科学领域:

  • 材料科学
  • 纳米技术
  • 化学工程

背景情况:

  • 碳纳米管 (CNT) 为什么会生长的根本问题,尽管有几十年的研究,仍然没有得到答案.
  • 目前的理解表明,由于由石墨碳封装催化剂,CNT的增长在能量上是不利的.

研究的目的:

  • 阐明推动碳纳米管生长的潜在机制.
  • 在催化剂接口上解决CNT形成的基本问题.

主要方法:

  • 一个理论模型的开发,包括第一原则和分子动力学计算.
  • 对CNT-催化剂接口能量和接触角度的依赖性进行分析.

主要成果:

  • 确定了CNT催化剂边缘的接触角度依赖的界面能量作为一个关键因素.
  • 证明石墨盖的升起增加了接触角度,减少了6-9 eV/nm的界面形成能量.
  • 这种能量减少克服了范德瓦尔斯粘附,从而推动了CNT的增长.

结论:

  • 这项研究揭示了一种解释碳纳米管生长的新机制.
  • 在CNT-催化剂接口的接触角度依赖的界面能量是CNT形成的主要驱动因素.
  • 这一发现为纳米技术中的一个关键过程提供了基本的理解.