関連する実験動画
Updated: May 5, 2026

10:56
Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
Published on: May 21, 2014
11.5K
ポリディスペルスのプレート型粒子のサスペンションにおける液晶相転換
van der Kooij FM1, Kassapidou, Lekkerkerker
1Van't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute, Utrecht University, The Netherlands.
Nature
|September 6, 2000
まとめ
プレート状のコロイドは液晶相を形成し,安定した柱状の二次元結晶を含み,多分散度が著しい場合でも存在します. この発見は,合成メソスコピク材料における液晶の秩序の達成を簡素化しています.
科学分野:
- マテリアルサイエンス 材料科学
- ソフトマター物理学 ソフトマター物理学
- コロイド科学 コロイド科学
背景:
- セルフ・アセンブリ構造を持つコロイド式 суспенションは,特に光子材料では,技術的に重要である.
- 棒やプレートなどの非球形のコロイド粒子は,方向性や位置的な順序を持つ液晶を形成することができます.
- 多分散性 (粒子の大きさの変化) は,コロイド懸浮液における位置順序を妨げることができます.
研究 の 目的:
- プレート型コロイド Suspensionの液晶相の振る舞いを調査する.
- 粒子の濃度と多分散性の自己組み立てに対する影響を決定する.
- ポリディスパース系における秩序化された相の安定性を評価する.
主な方法:
- プレート型コロイド суспенションの製造と特徴付け.
- 粒子濃度の体系的な変化.
- 顕微鏡や散射技術による相変遷 (同otropic, nematic, columnar) の観測. 散射技術による相変遷 (同otropic, nematic, columnar) の観測. 顕微鏡や散射技術による相変遷 (isotropic, nematic, columnar) の観測. 顕微鏡や散射技術による相変遷 (isotropic, nematic, columnar) の観測.
- 構造的秩序と多分散性の効果の分析.
主要な成果:
- プレート状のコロイドのサスペンションは,濃度が増加するにつれて,同otropic, nematic, columnarフェーズを示した.
- 柱状の二次元結晶相は,多分散度で最大25%まで安定した.
- 微粒子の濃度が非常に高い場合,スメクティックのようなオーダーリングへの移行が観察されました.
結論:
- 合成メソスコプ材料における液晶の秩序は,これまで予想されていたよりも容易に達成可能である.
- プレート型のコロイドは,調節可能な性質を持つ秩序ある構造を作成するための有望な経路を提供します.
- 多分散性に対する柱状相の堅固さは,材料設計における重要な発見である.
関連する概念動画
Phase Transitions
19.1K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.1K
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
Polymer Classification: Crystallinity
3.1K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
3.1K
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 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...
5.7K
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...
189

