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相关概念视频

The Colloidal State01:29

The Colloidal State

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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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在溶液中通往大型二维六边形图案的合体纳米片的路径.

Bo Ni1, Mingjun Huang, Ziran Chen

  • 1Department of Polymer Science, The University of Akron , Akron, Ohio 44325-3909, United States.

Journal of the American Chemical Society
|January 16, 2015
PubMed
概括

我们探索了用化子进行块聚合物的自组装. 增加的水含量导致了新的结构,如体,纳米薄膜和囊泡,由自由能量控制.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 纳米技术 纳米技术

背景情况:

  • 区块共聚合物自组装成各种形态.
  • 多面体寡合性丝二氧化 (POSS) 具有独特的结构性质.
  • 将聚合物连接到POSS中,可以创建新的混合材料.

研究的目的:

  • 为了研究ABC块特聚合物的溶液自组合.
  • 探索化POSS对形态形成的影响.
  • 了解水含量在引导自组装结构中的作用.

主要方法:

  • 在1,4-二氧化/水混合物中的溶液自组装.
  • 使用ABC块聚合物与聚乙烯块聚 ((乙烯氧化物) 和化POSS.
  • 改变含水量以诱导形态过渡.

主要成果:

  • 观察到循环圆柱体,纳米片和囊泡的连续形成,含水量增加.
  • 鉴定了由竞争的端盖和曲能量驱动的 toroid 形成.
  • 证明FPOSS可以增强 toroid 的形成.
  • 展示了六边形图案纳米片和纳米图案囊泡的形成.

结论:

  • 自组装对水含量和聚合物架构高度敏感.
  • FPOSS在指导复杂形态形成方面发挥着至关重要的作用.
  • 这项研究为设计先进的纳米结构材料提供了洞察力.