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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

3.4K
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...
3.4K
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...
1.5K
Nonideal Two-Component Liquid Solutions01:29

Nonideal Two-Component Liquid Solutions

159
Nonideal liquid solutions, also known as real solutions, do not strictly follow Raoult's law. Raoult's law is a rule of thumb in physical chemistry. However, not all mixtures adhere to this law due to varying molecular interactions. For example, in an acetone/chloroform solution, the individual vapor pressures of the components are lower than expected, resulting in a total vapor pressure below that predicted by Raoult's law, causing a negative deviation.On the other hand, in an ethanol/water...
159
The Colloidal State01:29

The Colloidal State

189
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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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トポロジカルコロイドは,トポロジカルコロイドである.

Bohdan Senyuk1, Qingkun Liu, Sailing He

  • 1Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.

Nature
|December 25, 2012
PubMed
まとめ
この要約は機械生成です。

研究者らは,液晶の中で異なるトポロジーを持つコロイド粒子を調査した. 彼らは,粒子トポロジーは欠陥形成を決定し,トポロジカルチャージは保存され,数学定理に従っていることを発見しました.

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関連する実験動画

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Synthesis and Characterization of Supramolecular Colloids
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科学分野:

  • 柔らかい物質の物理学
  • コロイド科学 コロイド科学
  • 液晶物理学 液晶物理学について

背景:

  • コロイドは自然と技術において至るところに存在し,材料科学や量子ドット太陽電池の応用がある.
  • 自然に発生するコロイドは,表面張力最小化により,球状または球状の形状を持っています.
  • 粒子のトポロジーのコロイド系,特に液晶系への影響は,まだほとんど研究されていない.

研究 の 目的:

  • ネマティック液晶内のトポロジカル・デフェクトを決定するコロイド粒子トポロジーの役割を調査する.
  • 異なる数のハンドルを持つコロイド粒子を製造し,研究する (属 g=1-5).
  • トポロジカルチャージの保存と,確立された数学的定理への遵守を実験的にテストする.

主な方法:

  • コントロールされたトポロジーを持つコロイド粒子の製造 (属1-5).
  • これらの粒子をネマティック液晶介質に導入する.
  • 非線形光学画像を用いた誘導された3次元ディレクターフィールドとトポロジック欠陥の観測と分析.
  • 外部フィールド (電気,熱,レーザーツィージング) を適用して,構造的変化を誘発する.

主要な成果:

  • 異なるトポロジーを持つコロイド粒子は,異なる3次元ディレクターフィールドとトポロジー欠陥を誘発する.
  • トポロジカルチャージは,これらの誘導構造に保たれています.
  • 粒子による欠陥の総電荷は,ガウス・ボネットとポアンカレ・ホフ指数定理の予測に一貫して従う.
  • 3次元ディレクターフィールドにおけるトポロジカルチャージの割り当てと合計のための方法が確立され,検証されました.

結論:

  • コロイド・トポロジーは,液晶のトポロジカル・デフェクトの形成と振る舞いに根本的に影響する.
  • トポロジカルチャージの保存は,欠陥の振る舞いを理解し予測するための強力なツールを提供します.
  • これらの発見は,トポロジカルメモリデバイス,自己組み立て,および低次元トポロジーの研究における新しいアプリケーションの道を開きます.