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Colloids03:22

Colloids

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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...
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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...
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Colloidal precipitates01:09

Colloidal precipitates

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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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Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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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

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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...
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Facet-to-facet Linking of Shape-anisotropic Colloidal Cadmium Chalcogenide Nanostructures
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アクティブ・パッチ・コロイドとシェイプ・チューナブル・ダイナミック

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
まとめ
この要約は機械生成です。

研究者は低対称性の不均一な粒子を合成することで 活性コロイドのダイナミクスを正確に調整しました 先進的なマイクロ・ナノマシンの 動きと組み立ての制御を可能にします

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科学分野:

  • コロイド科学
  • 柔らかい物質の物理
  • 材料科学

背景:

  • アクティブ・コロイドの制御は 均衡のないシステムやマイクロマシンにとって 鍵となるものです
  • コロイド粒子の自律的移動と自発的組み立ては大きな課題です.

研究 の 目的:

  • 活性コロイドのダイナミクスを正確に調整する
  • 低対称性の形状を持つ活性パッチコロイドの合成を導入する.
  • 形状にコードされた情報 機関車と組み立ての行動を 探求する.

主な方法:

  • クラスター・エンカプスレーション・デュウェッティング・メソッドを用いて,低対称性の不均一なコロイドを大量合成する.
  • 粒子推進,ブレーキ,およびステアリングを調節するためにAC電場を使用します.
  • 粒子の幾何学,パッチ構成,側面比が動力学に与える影響を調査する.

主要な成果:

  • 粒子推進速度,ブレーキ,および非対称なパッチと曲がり角の調節.
  • モノパッチ粒子から スピナーや協働性のある水泳器のような ダイナミックで再構成可能な構造の形成です
  • 異なるサイズのパッチを持つ粒子を用いたダイナミックアセンブリにおける方向結合の実証.

結論:

  • 低対称性の不均一なコロイドは,活性コロイドのダイナミクスを正確に制御します.
  • 形状のプログラミングは 複雑なコロイドの振る舞いを設計する強力なツールです
  • 多様な外部刺激による将来の探索は 新しいダイナミクスと構造を約束します