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相关概念视频

Colloids03:22

Colloids

20.8K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
20.8K
Colloids and Suspensions01:17

Colloids and Suspensions

3.1K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
3.1K
Colloidal precipitates01:09

Colloidal precipitates

5.9K
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...
5.9K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

74.3K
Dipole Moment of a Molecule
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VSEPR Theory and the Basic Shapes02:52

VSEPR Theory and the Basic Shapes

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Overview of VSEPR Theory
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Molecular Shapes01:18

Molecular Shapes

61.4K
Molecules have characteristic shapes that are crucial for their function. The arrangement of various electron groups around the central atom dictates their molecular geometry. Electron pairs in the valence shell of a central atom will adopt an arrangement that minimizes repulsions between the electron pairs by maximizing the distance between them. The valence electrons form either bonding pairs, located primarily between bonded atoms, or lone pairs.
Two regions of electron density in a diatomic...
61.4K

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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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具有可调整形状动态的活性拼接体

Zuochen Wang1, Zhisheng Wang1, Jiahui Li1

  • 1Department of Chemistry , The University of Hong Kong , Pokfulam Road , Hong Kong SAR , China.

Journal of the American Chemical Society
|August 27, 2019
PubMed
概括
此摘要是机器生成的。

研究人员通过合成低对称的零星粒子精确调整了活性合体动力学. 这些工程合体可以控制先进的微型和纳米机器的移动和组装.

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科学领域:

  • 体科学
  • 软物质物理学
  • 材料科学

背景情况:

  • 控制活性合物是失衡系统和微机器的关键.
  • 自主移动和自发组合的体颗粒存在重大挑战.

研究的目的:

  • 为了证明活性合体动态的精确调整.
  • 引入具有低对称形状的活性斑块性合体的合成.
  • 探索形状编码的信息编程机车和组装行为.

主要方法:

  • 使用集群封装脱水方法大量合成低对称的不整体合物.
  • 使用交流电场调节粒子推进,制动和转向.
  • 研究粒子几何,补丁配置和面积比对动态的影响.

主要成果:

  • 通过不对称的补丁和曲角度调节粒子推进速度,制动和转向.
  • 从单片粒子中形成可重构的动态结构,如旋转器和协同游泳器.
  • 在动态组件中使用具有不同尺寸补丁的粒子进行定向粘合的演示.

结论:

  • 低对称的不整体合体可以精确控制活性合体动力学.
  • 形状可编程性是设计复杂的体行为的一个强大工具.
  • 未来的探索与多样化的外部刺激承诺新的动态和结构.