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Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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前体衍生Mo2C/SiC复合材料具有二维板结构,用于电磁波吸收.

Yang Li1, Wen Yang2, Jipeng Zhang2

  • 1School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.

Materials (Basel, Switzerland)
|April 24, 2025
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概括

这项研究引入了一种新的碳化/碳化陶,用于微波吸收. 它克服了传统碳化的局限性,通过减少碳含量和通过二维结构增强吸收.

关键词:
在Mo2C/SiC中.聚合物衍生陶 (PDC) 是一种聚合物衍生陶.这是一个二维的板结构结构结构.波浪的吸收波浪的吸收

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科学领域:

  • 材料科学 材料科学 材料科学
  • 陶工程 陶工程
  • 微波工程 微波工程

背景情况:

  • 前体衍生的碳化 (SiC) 陶是有效的微波吸收器,但在高温下遭受剩余碳问题.
  • 在恶劣环境中的应用,如高速飞机,受碳含量限制.

研究的目的:

  • 开发一种新的碳化/碳化 (Mo2C/SiC) 微波吸收陶.
  • 解决SiC陶中剩余碳的局限性,用于高温应用.
  • 通过独特的2D板结构来增强微波吸收特性.

主要方法:

  • 聚碳烯涂层硫化物 (PCS@MoS2) 的热解以形成Mo2C/SiC复合物.
  • 在热解过程中,MoS2与自由碳之间进行受控反应,以减少碳含量并形成Mo2C.
  • 利用MoS2的分层结构创建一个2D复合结构.

主要成果:

  • Mo2C/SiC陶成功合成了碳含量降低的材料.
  • 实现了二维复合结构,显著提高了微波吸收.
  • 记录了8.96 GHz的最小反射损失 (RLmin) 为-46.49dB,厚度为2.6mm.
  • 有效吸收带宽 (EAB) 覆盖了整个X频段 (8-12 GHz).

结论:

  • 新型的Mo2C/SiC陶有效地减轻了SiC吸收器中的残留碳问题.
  • 来自MoS2的2D板结构显著提高了微波吸收性能.
  • 这种材料对高温微波吸收应用非常有前途.