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Colloids03:22

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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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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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Excess Pressure Inside a Drop and a Bubble01:13

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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.
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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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Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,
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バブルペア駆動型コロイドカヤカー

Yingjie Wu1, Tieyan Si1, Changyong Gao1

  • 1Key Laboratory of Microsystems and Microstructures Manufacturing, Ministry of Education , Harbin Institute of Technology , Yi Kuang Jie 2 , Harbin 150080 , China.

Journal of the American Chemical Society
|September 5, 2018
PubMed
まとめ
この要約は機械生成です。

研究者らは,自己駆動運動を達成するために,過酸化水素から酸素の泡を使用する,空洞のダンベル形の二酸化マンガン (MnO2) ナノモーターを開発しました. 非対称な触媒部位はバブルダイナミクスを制御し,ナノモーターのアプリケーションの制御された動きを可能にします.

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科学分野:

  • コロイド科学
  • ナノテクノロジー
  • 化学工学

背景:

  • 触媒ナノモーターはマイクロスケールでの応用の可能性を備えています
  • バブル駆動推進は ナノテクノロジーの新興分野です
  • マンガンの二酸化物 (MnO2) は,過酸化水素の分解のための知られている触媒である.

研究 の 目的:

  • 新しい空洞のダンベル形 MnO2 コロイドナノモーターの設計と研究.
  • 酸素バブルで動く 自動運動のメカニズムを探る
  • アシンメトリックな触媒部位が ナノモーターのダイナミクスにどのように影響するかを理解する.

主な方法:

  • ホール・ダンベル型 MnO2 コロイドカヤックの合成
  • 水素過酸化物の触媒分解による酸素泡の生成
  • 泡の成長 (同期/非同期) とナノモーター運動の観察
  • オーバーダンプされたランゲヴィン方程式と流体場シミュレーションの適用

主要な成果:

  • MnO2コロイドカヤック機は酸素バブルで動いている自己駆動運動を示した.
  • 泡の成長モード (同期/非同期) は非対称な触媒部位によって制御された.
  • 非対称な推進力は 駆動力や心向上の力を生み出し 円形運動を引き起こした.
  • 実験ダイナミクスは,ランゲヴィン方程式とシミュレーションによって正確にモデル化されました.

結論:

  • 新しいバブルペア駆動型コロイドナノモーターが開発されました.
  • 非対称な触媒部位は ナノモーターの推進と運動の制御に不可欠です
  • この研究により,触媒ナノモーターの理解と応用が進んでいます.