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関連する概念動画

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft01:23

Design Example: Deciding Thickness of Lubricating Fluid in a Shaft

Effective lubrication between a rotating shaft and its bearing housing is essential in rotating machinery to minimize friction, wear, and energy loss. With carefully controlled thickness and viscosity, the lubricant layer prevents metal-to-metal contact, ensuring smooth operation.
To calculate the required thickness of the lubricant layer, the tangential velocity at the shaft's surface must first be determined. This velocity is calculated by converting the rotational speed to angular velocity...
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

Dry friction occurs when two solid surfaces slide against each other without any lubrication or fluid present. It causes resistance when pushing objects along a surface, like a gardener pushing a wheelbarrow. The force applied to move the cart causes dry friction between the wheel and the ground.
Before the wheelbarrow starts moving, the static frictional force acts tangentially to the contact surface, opposing the force that is about to induce the motion. This frictional force prevents the...
Dry Friction01:30

Dry Friction

Dry friction occurs between two solid surfaces in contact as they attempt to move relative to one another. In daily life, dry friction is encountered in various forms, such as when walking on the ground, sliding an object across a table, or rubbing hands together. Despite its ubiquity, the underlying mechanisms behind dry friction are not readily visible.
To illustrate this concept, imagine a wooden crate resting on a rough, non-uniform horizontal surface. When an external force is applied to...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
Surface Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
Colloids03:22

Colloids

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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関連する実験動画

Updated: Jun 24, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

ポリズウィテリオンブラシによる生理学的圧力での潤滑.

Meng Chen1, Wuge H Briscoe, Steven P Armes

  • 1Physical and Theoretical Chemistry Laboratory, University of Oxford, Oxford OX1 3QZ, UK.

Science (New York, N.Y.)
|March 28, 2009
PubMed
まとめ

研究者らは,水性環境での極端な潤滑のための先進的なポリズウィテリオンブラシを開発しました. これらの合成表面は,超低摩擦を達成し,天然の関節を模倣し,改良された人工関節と機械アプリケーションの潜在能力を提供します.

科学分野:

  • バイオミメティクスと材料科学
  • 表面化学とトライボロジー

背景:

  • 自然なシナヴィアル関節は,高圧 (>5 MPa) の下でも,非常に低い摩擦係数 (μ < 0.002) を示す.
  • このレベルの潤滑を人工関節や水性環境内の工学的な表面で再現することは,依然として大きな課題です.
  • 既存の合成表面は,水中の生物学的関節のトライボロジカル性能に匹敵しません.

研究 の 目的:

  • 水性環境で超低摩擦を達成できる合成表面を設計する.
  • バイオミメティック潤滑のためのポリズウィテリオンブラシの可能性を調査する.
  • 表面水分化と潤滑性能の関係を探求する.

主な方法:

  • ポリズウィテリアンブラシのポリメリゼーションは,水中介の表面から直接発生します.
  • 異なる圧力 (最大7.5MPa) の下での摩擦係数 (μ) の測定.
  • フォスフォリクロリン類のモノマーに起因する表面水分化の性質の分析.

主要な成果:

  • 7.5MPaまでの圧力で μ = 0.0004まで低度の超低摩擦係数を達成しました.
  • 以前報告された合成水系システムの潤滑性能を上回る,実証された潤滑性能.
  • ポリズウィテリオンのブラシ構造によって提供される強力な水分補給と相関する極端な潤滑.

さらに関連する動画

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
09:21

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Published on: September 28, 2015

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
08:05

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

関連する実験動画

Last Updated: Jun 24, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer
09:21

Experiments on Ultrasonic Lubrication Using a Piezoelectrically-assisted Tribometer and Optical Profilometer

Published on: September 28, 2015

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
08:05

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

結論:

  • 表面から直接ポリメリズされたポリズウィテリオンブラシは,極端な水性潤滑を達成するための非常に効果的な戦略を提供します.
  • これらのブラシによって形成される頑丈な水分補給層は,それらの卓越したトライボロジック性能の鍵です.
  • このブレークスルーは,高度な人工関節の設計と,様々な水性ベースの技術における潤滑の改善に重大な影響を及ぼします.