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関連する概念動画

Colloids03:22

Colloids

22.1K
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 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...
22.1K
Colloids and Suspensions01:17

Colloids and Suspensions

3.9K
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...
3.9K
Colloidal precipitates01:09

Colloidal precipitates

6.9K
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...
6.9K
Coagulation01:06

Coagulation

1.7K
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...
1.7K
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

3.9K
The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
3.9K
The Colloidal State01:29

The Colloidal State

153
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...
153

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関連する実験動画

Updated: Apr 8, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
10:28

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 4, 2014

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コロイド科学:非球形のバブル

Anand Bala Subramaniam1, Manouk Abkarian, L Mahadevan

  • 1Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, USA.

Nature
|December 16, 2005
PubMed
まとめ
この要約は機械生成です。

研究者らは,粒子を装着したバブルが,安定した非球形の形を維持できることを発見しました. 核融合中の粒子の阻害は,表面張力が球形を形成することを妨げ,新しい泡の幾何学を可能にします.

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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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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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関連する実験動画

Last Updated: Apr 8, 2026

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
10:28

Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids

Published on: January 4, 2014

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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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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System
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Induction of Microstreaming by Nonspherical Bubble Oscillations in an Acoustic Levitation System

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科学分野:

  • 流体力学 流体力学
  • 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

背景:

  • 表面張りは自然に液滴やガス泡を球形に変えて表面積を最小限に抑えるようにします.
  • バブルとドロップの安定した非球形の形状を達成することは,流体力学の長年の課題です.

研究 の 目的:

  • ガスバブルと液滴における非球形の形状の安定化の可能性を調査する.
  • 粒子モノレイヤーがバブルとドロップのインターフェイス特性を変化させる役割を探求する.

主な方法:

  • 密集した単層の粒子で覆われたガスの泡や液体の滴を作り出す.
  • 個々のバブルと融合したバブルの形を観察する.
  • インタフェース変形時に粒子単層の機械的性質を分析する.

主要な成果:

  • 粒子を装着したバブルとドロップが,安定した非球形の構成で存在することを実証した.
  • インタフェースでの粒子の阻害は,表面張力最小化を克服するために必要なストレスのサポートを提供することを示しました.
  • 溶融した装甲バブルは,粒子詰まりにより非対称な形状を維持することが観察されました.

結論:

  • 粒子装甲は,非球形の泡や滴を安定させるための新しいメカニズムを提供します.
  • この発見は,流体界面の形状決定に関する従来の理解に挑戦しています.
  • 粒子のジャミングは,複雑なインタフェースの幾何学を制御し,設計するための経路を提供します.