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関連する概念動画

Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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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...
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Journal Bearings01:23

Journal Bearings

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Journal bearings are mechanical components that support and provide lateral stability to rotating shafts and axles. They are crucial in reducing friction, wear, and vibration in machinery such as engines, turbines, and pumps. The principle behind journal bearings is forming a thin lubricant film between the bearing surface and the rotating shaft, which minimizes direct contact and reduces frictional forces.
To better understand the concept of journal bearings, consider a rope winch with dry or...
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Dry Friction01:30

Dry Friction

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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...
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Friction is an essential concept in physics, engineering, and everyday life. It is the force that opposes the relative motion or tendency of such motion between two surfaces in contact. One of the most common types of friction encountered in various applications is dry friction. Dry friction problems can be broadly categorized into three types, each with unique characteristics and challenges.
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Kinetic Friction01:26

Kinetic Friction

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Consider a truck trying to pull a stationary car. As the truck exerts a force on the car, static friction is created at the point of contact between the two surfaces. This frictional force resists the car's movement and keeps it at rest. However, when the applied force by the truck surpasses the limiting static frictional force, an interesting phenomenon occurs. The frictional force at the interface reduces to a lower value, known as the kinetic frictional force. At this point, the car...
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潤滑油による炭素基のトリボフィルム

Ali Erdemir1, Giovanni Ramirez1, Osman L Eryilmaz1

  • 1Energy Systems Division, 9700 South Cass Avenue, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Nature
|August 5, 2016
PubMed
まとめ

研究者は,触媒表面を用いたベースオイルから,新しい炭素ベースの固体トリボフィルムを開発しました. これらの高度な潤滑膜は摩擦と磨きを大幅に軽減し,従来の耐磨剤を上回ります.

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科学分野:

  • トリボロジー
  • 材料科学
  • 表面化学

背景:

  • 移動する機械的インターフェースは,潤滑と磨きを減らすために,流体フィルムと固体トリボフィルムに依存しています.
  • 伝統的な潤滑剤はジンクダイアルキルジチオホスファートなどの耐磨添加物を使用していますが,摩擦と磨きを最小限に抑えることは依然として課題です.
  • 最近の進歩は 潤滑剤の性能を高めるために ナノ粒子とイオン液体を探求しています

研究 の 目的:

  • 炭素基のトリボフィルムがベースオイル分子から直接形成される過程を研究する.
  • 液体と固体の両方の潤滑膜を形成できるようにする.
  • 摩擦と磨きを最小限に抑えるための高度な潤滑戦略を開発する.

主な方法:

  • 滑りやすい表面にナノ結晶の触媒コーティング (銅またはニッケル触媒を伴うモリブデンまたはバナジウム窒化物) を使用した.
  • トリボフィルムの性能を評価するために1.3GPaの接触圧でボール・オン・ディスク試験を行った.
  • トリボフィルム形成メカニズムを理解するために,反応性およびアビニシオ分子動力学シミュレーションを使用した.

主要な成果:

  • 塩基油から 炭素基のトリボフィルムを ダイヤモンドのような構造で作りました
  • ジンクダイアルキルジホスファートと比較して,磨きがほぼなくなり,摩擦が著しく低下した.
  • シミュレーションにより,オレフィンの触媒性脱水と分裂が示され,再結合によりトリボフィルムが形成された.

結論:

  • 触媒コーティングは,ベースオイルが効果的な固体トリボフィルムを形成し,潤滑性を高めます.
  • このアプローチは,摩擦と磨きを減らすために従来の耐磨添加物よりも優れた代替手段を提供します.
  • 開発されたトリボフィルムは,要求の高い機械的なアプリケーションで優れた性能を示しています.