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Colloids03:22

Colloids

17.2K
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...
17.2K
The Colloidal State01:29

The Colloidal State

184
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...
184
Colloids and Suspensions01:17

Colloids and Suspensions

3.4K
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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Three-Dimensional Microscopy in Microbiology01:28

Three-Dimensional Microscopy in Microbiology

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Colloidal precipitates01:09

Colloidal precipitates

5.7K
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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Coagulation01:06

Coagulation

1.5K
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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三次元ロックと鍵のコロイド

Yu Wang1, Yufeng Wang, Xiaolong Zheng

  • 1Molecular Design Institute and Department of Chemistry, New York University , New York, New York 10003, United States.

Journal of the American Chemical Society
|May 3, 2014
PubMed
まとめ
この要約は機械生成です。

研究者は,ハイブリッド粒子からシリカテンプレートを除去することによって,ユニークな多孔性コロイドを作成しました. これらの"ロック"粒子は,複数の"キー"粒子を可逆的に結合させ,サイト固有の相互作用を可能にします.

さらに関連する動画

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関連する実験動画

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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科学分野:

  • マテリアルサイエンス 材料科学
  • コロイド科学 コロイド科学
  • 超分子化学 超分子化学

背景:

  • オーガノ・シリカ・ハイブリッド・パッチ粒子は,複雑なコロイド構造を設計するための多用途のプラットフォームを提供します.
  • テンプレート支援合成は,制御された内部アーキテクチャを持つ粒子を作成するための重要な戦略です.

研究 の 目的:

  • テンプレート除去法を使用して,よく定義された多孔性を持つコロイドを合成する.
  • これらの多孔性粒子の自己組み立て行動を,より小さな"キー"粒子で探求する.

主な方法:

  • 前組み立てのオーガノ-シリカハイブリッドのパッチ粒子からシリカクラスターテンプレートを水溶分解して除去する.
  • その結果生じる多孔性コロイド構造とその対称性の特徴.
  • 多孔性の"ロック"粒子とより小さな"キー"粒子間の枯渇相互作用による自己組み立ての調査.

主要な成果:

  • 様々な3D対称性 (球形,線形,三角形,四面形,三角形二ピラミッド形,八面形,五角形二ピラミッド形) を表す精密に定義された多穴を持つコロイドを成功裏に合成しました.
  • 洞の表面が滑らかで,浅さとサイズが制御可能であることを実証した.
  • "ロック"粒子が複数の"キー"粒子を結合し,多価,場所固有の,可逆性,および柔軟なアセンブリを形成する能力を示しました.

結論:

  • 開発された方法は,調整可能な幾何学を持つ新しい多孔性コロイド構造ブロックにアクセスできます.
  • これらの多孔粒子 (multicavity particles) は,プログラム可能な自己組み立てを通じて,複雑で応答性の高い超分子構造を作り出すための汎用性のあるプラットフォームとして機能します.