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Colloids03:22

Colloids

21.6K
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...
21.6K
Colloidal precipitates01:09

Colloidal precipitates

6.6K
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...
6.6K
Colloids and Suspensions01:17

Colloids and Suspensions

3.6K
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...
3.6K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

6.9K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
6.9K
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
Fusion of Secretory Vesicles with the Plasma Membrane01:26

Fusion of Secretory Vesicles with the Plasma Membrane

19.1K
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
19.1K

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Updated: Feb 22, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

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コロイド融合によって作られたパッチ状の粒子

Zhe Gong1, Theodore Hueckel1, Gi-Ra Yi2

  • 1Molecular Design Institute, Department of Chemistry, New York University, 29 Washington Place, New York, New York 10003, USA.

Nature
|September 19, 2017
PubMed
まとめ
この要約は機械生成です。

研究者は 精密にパターン化された ぼちぼちの粒子を 作り出すために 拡張可能なコロイド融合方法を開発しました この突破により 複雑なコロイド構造を高精度で実験的に実現し 以前の製造上の課題を克服することができました

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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科学分野:

  • コロイドと表面科学
  • 材料科学
  • ナノテクノロジー

背景:

  • コロイド粒子の表面のパッチは 複雑な構造に自己組み立てを誘導します
  • 精密にパターン化された不均一な粒子の実験的合成は依然として大きな課題です.
  • 既存の合成方法では,しばしば幾何学的な近似が不十分で,収穫量が低い.

研究 の 目的:

  • 機能的なパッチ粒子を作るためのスケーラブルで調整可能な方法を導入する.
  • 粒子の表面の形状を正確に設計できるように
  • パッチな粒子の計算設計と実験的実現の間のギャップを埋めるために

主な方法:

  • 協調力学と湿気力を利用したコロイド融合技術.
  • ハイブリッド液体-固体クラスターは プラスチックの添加で不均一な粒子へと進化します
  • 表面エネルギー最小化によって 粒子の形状を制御する

主要な成果:

  • 調整可能なスケーラブルなパッチ粒子製造を達成しました.
  • 液体パッチを持つ球形粒子と面状の液体区画を持つ粒子という2つの製品部門を特定した.
  • 頑丈なスーパーコロイド構造とコロイドの多面体を形成する能力を示した.

結論:

  • コロイド融合法では,不規則な粒子の高精度合成のためのスケーラブルな戦略を提供します.
  • このテクニックは,計算で設計された表面パターンの実験的な再現を可能にします.
  • 予測可能な微細構造を持つ高度な自己組み立て材料の開発を可能にします.