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相关概念视频

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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通过微流体自组装的流量定向块共聚合物微粒形态.

Chih-Wei Wang1, David Sinton, Matthew G Moffitt

  • 1Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, BC, Canada V8W 3V6.

Journal of the American Chemical Society
|October 14, 2011
PubMed
概括

两类块共聚合物在微流体反应器内自组装成多样化的,流量定向的纳米结构,与静态的,离芯片形成不同. 这种可控组件可以在芯片上精确制造功能性体纳米结构.

科学领域:

  • 聚合物科学 聚合物科学
  • 材料科学 材料科学 材料科学
  • 化学工程是化学工程的重要组成部分.

背景情况:

  • 在平衡条件下,两类块共聚合物自组装成球形小粒.
  • 控制共聚合物自我组装以实现非平衡形态是具有挑战性的.
  • 微流体反应器为研究动态自组装过程提供了独特的环境.

研究的目的:

  • 在气液微流体反应堆中研究两类块共聚物的自我组装.
  • 探索不同于平衡结构的流向导向菌根形态的形成.
  • 展示芯片上的处理,以创建特定的功能体纳米结构.

主要方法:

  • 使用气体液体微流体反应器用于共聚物自组装.
  • 采用聚乙烯-块-聚 (?? 烯酸) 共聚合物.
  • 操纵水含量和流量以控制纳米结构的形成.
  • 研究了由芯片上剪切场驱动的碰撞凝聚机制.

主要成果:

  • 生成动力圆柱体,Y连接点,双层和网络,偏离离芯片外球形结构.
  • 实现了流量导向纳米结构的可变尺寸和相对数量.
  • 证明了芯片上的剪切场使复杂形态的碰撞凝聚成为可能.

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  • 展示了在芯片上的处理路径,以获得特定的功能体纳米结构.

    • 结论:

    • 微流体反应器可以产生新的,流量定向的状体形态.
    • 在芯片上切割场对于实现非平衡自组装路径至关重要.
    • 这项研究为功能体纳米结构的按需合成提供了一个平台.