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相关概念视频

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
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相关实验视频

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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多晶石墨烯的域增长在多晶石墨烯中

Zihua Liu1, Debabrata Panja1, Gerard T Barkema1

  • 1Department of Information and Computing Sciences, Utrecht University, 3584 CC Utrecht, The Netherlands.

Nanomaterials (Basel, Switzerland)
|December 22, 2023
PubMed
概括

这项研究使用蒙特卡洛方法模拟了多晶石墨烯域粗化. 结果显示,缺陷扩散和域大小变化遵循特定分布,为石墨烯制造和应用提供了洞察力.

科学领域:

  • 材料科学 材料科学 材料科学
  • 凝聚物质物理学 凝聚物质物理学
  • 计算化学计算化学

背景情况:

  • 石墨烯的独特特性使其成为众多应用的理想选择.
  • 多晶石墨烯的缺陷显著影响其性能.
  • 了解晶域粗化对于优化石墨烯至关重要.

研究的目的:

  • 在多晶石墨烯中模拟晶域粗化过程.
  • 分析缺陷行为和域增长动态.
  • 为了研究曲折和基板效应对石墨烯结晶的影响.

主要方法:

  • 使用蒙特卡洛方法,优化了Wooten,Winer和Weaire (WWW) 算法.
  • 对债券/角度分布和缺陷演变进行了统计分析.
  • 研究了缺陷扩散和格子方向的空间相关性.

主要成果:

  • 模拟的样本配置与实验数据有很好的一致性.
  • 缺陷分布的时间演变和格子方向相关性遵循了一个伸展的指数分布.
  • 域大小变化表现出权力规律分布,并分析了缺陷扩散.

结论:

关键词:
蒙特卡罗的动态 蒙特卡罗的动态没有秩序的材料.域名增长 域名增长谷物边界的谷物边界是什么聚晶石墨烯是一种多晶石墨烯.

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  • 这项研究提供了对多晶石墨烯域增长过程的见解.
  • 这些发现为石墨烯研究的理论和实验进步提供了指导.
  • 研究了曲对基质效应下的结晶率的影响.