関連する実験動画
Updated: Jul 29, 2026
10:56
Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
Published on: May 20, 2014
コロイド硬球式サスペンションのダイナミック異質性の直接観察
1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, Padualaan 8, 3584 CH Utrecht, Netherlands. Institute for Atomic and Molecular Physics, Stichting voor Fundamenteel Onderzoek der Materie (FOM),
Science (New York, N.Y.)
|January 15, 2000
まとめ
密度の高いコロイド硬球体液体において,動的異質性が観察されました. これらの複雑な粒子の動きは,拡散と非ガウス位移分布に影響を与えます.
科学分野:
- コロイド科学 コロイド科学
- 柔らかい物質の物理学
- マテリアルサイエンス 材料科学
背景:
- 密度の高い液体のダイナミクスを理解することは,材料科学にとって極めて重要です.
- コロイド系は,基本的な液体の振る舞いを研究するためのモデルシステムとして機能します.
- 動的異質性とは,液体内の移動性が異なる局所的な領域である.
研究 の 目的:
- コロイド硬球の実空間ダイナミクスを調査する.
- 密度の高い液体における動的異質性に関する実験的証拠を提供すること.
- これらの異質性が粒子の移動と拡散に与える影響を分析する.
主な方法:
- 時間の解像度のある光コンフォカルスキャニング顕微鏡を用いて.
- 大量コロイドサンプルを2Dスライスで粒子の軌道を分析する.
- 粒子移動の確率分布を特徴づける.
主要な成果:
- 動的異質性に対する直接的な実験的証拠が得られた.
- 粒子移動の非ガウス確率分布が観察されました.
- ダイナミックな異質性は,長期にわたる拡散行動の発生に影響することが示されました.
結論:
- 動的異質性は,密度の高いコロイド液体の重要な特徴である.
- これらの異質性は,粒子運動の統計的性質に大きく影響する.
- この発見は,液体動力学と相変化のより深い理解に貢献します.
関連する概念動画
03:22Colloids
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...
01:17Colloids 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...
01:09Colloidal 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...
01:29The 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...