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関連する概念動画

Cohesion01:07

Cohesion

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 surface,...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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...
Accelerating Fluids01:17

Accelerating Fluids

When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...
Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

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.
Surface Tension of Fluid01:22

Surface Tension of Fluid

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 with...

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関連する実験動画

Updated: Jul 19, 2026

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
08:49

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

Published on: February 17, 2019

水中の2つの変形可能な油滴の間のダイナミック・フォース

Raymond R Dagastine1, Rogério Manica, Steven L Carnie

  • 1Particulate Fluids Processing Center, University of Melbourne, Victoria 3010, Australia.

Science (New York, N.Y.)
|July 15, 2006
PubMed
まとめ

研究者は,液滴の間の動的力を定量化し,接面変形と表面力が,乳液や細胞のような軟質物質系における相互作用をどのように制御しているかを明らかにした.

科学分野:

  • 柔らかい物質の物理学
  • 流体力学 流体力学
  • コロイド科学とは,コロイドの科学である.

背景:

  • コロイドサスペンションの静的相互作用はよく理解されています.
  • 生物学的応用に不可欠な軟質系におけるダイナミックな相互作用は,未だに十分に理解されていない.
  • 混合不可能な液体の液滴は,これらのダイナミックな相互作用を研究するためのモデルシステムとして機能します.

研究 の 目的:

  • 液滴間の動力力の直接的な力測定と定量的理論的記述を提示する.
  • 界面変形,静的表面力,および水力動的排水間の相互作用を解明する.
  • ナノスケールとブラウンの時間スケールでのドロップレット対ドロップレット相互作用の洞察を提供するために.

主な方法:

  • 相互作用を定量化するために,直接的な力測定技術が採用されました.
  • 観察された動力的な力を記述するために,定量的理論的枠組みが開発されました.
  • 分析は,インターフェースの特性と相互作用のダイナミクスの関係に焦点を当てた.

主要な成果:

  • 界面変形,静的な表面力,および水力動力学的排水との間に強い関連が示されました.
  • ダイナミックなドロップレット-ドロップレット相互作用は,ナノメートルの長さスケールで特徴付けられました.

さらに関連する動画

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

Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown
04:56

Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown

Published on: June 27, 2025

関連する実験動画

Last Updated: Jul 19, 2026

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions
08:49

Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

Published on: February 17, 2019

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

Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown
04:56

Real-Time Force Measurement Between Emulsion Droplets During Enzymatic Breakdown

Published on: June 27, 2025

  • このダイナミクスは,ブラウンの衝突の時間スケールで発生することが観察されました.

    • 結論:

    • この研究は,液滴システムにおけるダイナミック・フォースの包括的な理解を提供します.
    • 発見は,様々な軟質系における懸浮滴の制御と操作に直接適用できます.
    • この研究は,産業用エムルションから細胞の相互作用まで,さまざまな現象を理解するための意味を持っています.