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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Surface Tension of Fluid01:22

Surface Tension of Fluid

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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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表面液体層における隠されたナノスケールダイナミック化学を固体液体界面で視覚化

Longjie Liu1, Chao Xing1, Mingyang Song1

  • 1State Key Laboratory for Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China.

Journal of the American Chemical Society
|December 5, 2025
PubMed
まとめ
この要約は機械生成です。

ナノスケールの化学反応を固体-液体界面で観察するための新しい電子顕微鏡のプラットフォームを開発しました. この技術は,水の浄化と環境修復を理解するために不可欠なダイナミックなインターフェイス変換を捉えます.

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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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Revealing Dynamic Processes of Materials in Liquids Using Liquid Cell Transmission Electron Microscopy
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Revealing Dynamic Processes of Materials in Liquids Using Liquid Cell Transmission Electron Microscopy

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科学分野:

  • 表面化学とナノテクノロジー
  • 環境科学と工学
  • 材料科学

背景:

  • ナノスケールでの固体液体界面の理解は 水の浄化と浄化に不可欠です
  • 従来の技術は空間と時間の制限により 暫定的な界面化学変換を捉えるのに苦労します

研究 の 目的:

  • ダイナミックなナノスケールインターフェイス化学の研究のための新しいマルチモダル高解像度電子顕微鏡プラットフォームを導入する.
  • 液体と相互作用する表面の構造,構成,およびバレンスの化学をリアルタイムで3Dで解明する.

主な方法:

  • 液相電子顕微鏡,冷凍電子顕微鏡,電子トモグラフィ,電子エネルギー損失スペクトロスコピー,X線エネルギー分散スペクトロスコピーの統合.
  • クローゼーションで固定し, インターフェースで追跡し, 周囲のトモグラフィを総合的に分析する.

主要な成果:

  • モデル鉄ナノ粒子を用いて,インターフェイスチャージの影響による層厚さのナノスケール変化を明らかにした.
  • 液相およびインターフェイスアーキテクチャのイオン媒介における元素の値位状態の空間的分布をマッピングした.
  • インタフェースのダイナミクスをリアルタイムで3次元にマッピングした.

結論:

  • マルチモダルのプラットフォームは 反応性インタフェースの化学的進化に 前例のない洞察力を提供します
  • この方法は,ナノマテリアル汚染物質システムに広く適用され,触媒と環境修復に関する理解を深めることができます.