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関連する概念動画

Solution Equilibrium and Saturation01:59

Solution Equilibrium and Saturation

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Imagine adding a small amount of sugar to a glass of water, stirring until all the sugar has dissolved, and then adding a bit more. You can repeat this process until the sugar concentration of the solution reaches its natural limit, a limit determined primarily by the relative strengths of the solute-solute, solute-solvent, and solvent-solvent attractive forces. You can be certain that you have reached this limit because, no matter how long you stir the solution, undissolved sugar remains. The...
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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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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Colloids and Suspensions01:17

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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 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...
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Colloidal precipitates01:09

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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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The Colloidal State01:29

The Colloidal State

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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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溶剤で包まれた変形性コロイド結晶: 微弱な外部の干渉に敏感な高度に変異性のあるコロイド組成.

Dongpeng Yang1, Siyun Ye, Jianping Ge

  • 1Shanghai Key Laboratory of Green Chemistry and Chemical Processes, Department of Chemistry, East China Normal University , Shanghai 200062, People's Republic of China.

Journal of the American Chemical Society
|November 26, 2013
PubMed
まとめ

研究者らは,有機溶媒を用いた新種の変態安定結晶型コロイド配列 (CCA) を開発した. 簡単に組み立てたり分解したりできるこれらのコロイド結晶は,外部の干渉に敏感です.

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科学分野:

  • 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
  • ナノテクノロジー ナノテクノロジー

背景:

  • 伝統的に,コロイド結晶は固定系である.
  • メタステーブル結晶コロイド配列 (CCA) は新しいパラダイムを提供します.
  • これらのシステムは粒子間の力によって安定させられる.

研究 の 目的:

  • 溶媒で包んだ変態安定結晶コロイド配列 (CCA) を準備し,特徴づけること.
  • これらのメタステーブルなCCAの自己組み立てと相分離のダイナミクスを理解する.
  • これらのCCAの外部刺激に対する感受性を調べる.

主な方法:

  • 過剰飽和が誘発した降水と有機溶媒における自己集合.
  • 水晶の安定性を評価するために,蒸発中の反射強度を監視します.
  • サスペンション,結晶,および液体相における粒子の体積分子の分析.
  • 水晶相の体積分数と粒子の比率の計算.

主要な成果:

  • メタステーブルなCCAは,順序付けられた構造で成功裏に準備されました.
  • これらのCCAは,高温では数時間,室温ではより長く安定性を発揮します.
  • 形成過程は,顕微鏡の相分離として識別されました.
  • 粒子濃度の上昇は,恒常的な格子間隔を持つ大きな結晶サイズをもたらした.
  • メタステーブルなCCAは,簡単に反転可能な組み立てと分解を証明しています.

結論:

  • メタステーブルなCCAは,新しい種類のオーダーされたコロイド系を表しています.
  • 逆戻り可能な性質により,簡単に組み立て,解体できます.
  • これらのCCAは,運動や切断力などの微妙な外部の干渉に対して非常に敏感です.