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関連する概念動画

Surface Tension of Fluid01:22

Surface Tension of Fluid

484
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...
484
Cohesion01:07

Cohesion

55.8K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
55.8K
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

29.2K
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...
29.2K
Adhesion01:14

Adhesion

41.5K
Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
41.5K
Capillarity in Fluid01:19

Capillarity in Fluid

386
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
386
Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

2.3K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
2.3K

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関連する実験動画

Updated: Sep 10, 2025

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

5.5K

自己駆動ドロップルで湿潤性能を検知する

Bernardo Boatini1, Cristina Gavazzoni1, Leonardo Gregory Brunnet1

  • 1Instituto de Física, Universidade Federal do Rio Grande do Sul, Caixa Postal 15051, CEP 91501-970, Porto Alegre, Rio Grande do Sul, Brazil. b.boattini@gmail.com.

Soft matter
|August 26, 2025
PubMed
まとめ
この要約は機械生成です。

活性物質物理学は,表面上の滴の転移安定性を研究するための新しい方法を提供します. ドロップレットの活動を増やすことはエネルギー障壁を克服し,メタステーブルな湿気状態の探査と抑制を可能にします.

さらに関連する動画

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

10.6K
Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

6.8K

関連する実験動画

Last Updated: Sep 10, 2025

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

5.5K
Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
08:02

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

Published on: April 17, 2018

10.6K
Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
07:18

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method

Published on: June 14, 2019

6.8K

科学分野:

  • 物理学
  • 材料科学
  • 表面科学

背景:

  • 湿気現象は,水嫌または水性表面を使用する技術にとって重要です.
  • サブストラットは,表面条件またはドロップレットの歴史のために複数の湿潤状態 (メタスタビリティ) を表すことができます.
  • メタステーブル状態の制御はアプリケーションにとって不可欠ですが,現在の研究方法は複雑で高価です.

研究 の 目的:

  • 活性物質物理学の概念を用いて滴状転移安定性を研究するための代替アプローチを導入する.
  • 新しい計算モデルを使って 柱状の表面での滴水行動を調査する.
  • メタステーブルな湿気状態の探査と抑制にドロップレット活動がどのように影響するかを示すために.

主な方法:

  • 3状態のセルラーポットズモデルが採用され,自走ドロップレットをシミュレートするために極性項を組み込みました.
  • このモデルは,メタステーブルな湿気状態を示すと知られている柱状の基板に適用された.
  • 接触角の測定は,メタスタビリティを定量化するために使用されました.

主要な成果:

  • メタステーブル状態の間の自由エネルギーバリアを克服することができました.
  • この活動により,連続したメタステーブル湿度状態の探査が容易になりました.
  • メタスタビリティは最終的に十分な活動で完全に抑制されました.
  • アクティビティは乾燥状態と湿った状態の差を減らした.

結論:

  • アクティブマター物理学は,ドロップレットメタスタビリティを研究するための新しい計算効率の良い枠組みを提供します.
  • 複雑な表面での濡れる行動を制御する鍵となる要因です.
  • このアプローチは,接触角度測定を介してメタスタビリティを特定し,定量化するための信頼できる方法を提供します.