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Colloidal precipitates01:09

Colloidal precipitates

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...
Colloids03:22

Colloids

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...
The Colloidal State01:29

The Colloidal State

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 the...
Colloids and Suspensions01:17

Colloids and Suspensions

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...

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相关实验视频

Updated: May 20, 2026

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array
09:55

Preparation of Janus Particles and Alternating Current Electrokinetic Measurements with a Rapidly Fabricated Indium Tin Oxide Electrode Array

Published on: June 23, 2017

雅努斯的体火柴棒 雅努斯体火柴棒

Kundan Chaudhary1, Qian Chen, Jaime J Juárez

  • 1Department of Materials Science and Engineering and the Frederick Seitz Materials Research Laboratory, ‡Department of Physics, and §Department of Chemistry, University of Illinois , Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|August 1, 2012
PubMed
概括
此摘要是机器生成的。

制造出具有金色尖端的化学异型杆,称为Janus火柴棒. 这些粒子在溶液中自发地组装成复杂的多脚体结构.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 体科学 体科学 体科学
  • 纳米技术纳米技术

背景情况:

  • 化学和形状异构的合物对先进材料至关重要.
  • 控制异型粒子的自我组装是非常具有挑战性的.

研究的目的:

  • 为了制造和描述新的Janus火柴合物.
  • 为了研究这些异构粒子的自我组装行为.

主要方法:

  • 多步制造涉及电场对齐,结晶,微接触印刷和选择性金属化.
  • 在水溶液中直接观察自我组装.

主要成果:

  • 成功制造了金斯火柴的合物.
  • 观察自我组装成多足的结构 (双脚,三脚和四脚).
  • 组装结构的协调号和补丁角度的变化.

结论:

  • 简斯火柴是复杂的合体组件的多功能构建块.
  • 自组装过程提供了对结构形成的控制.