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Related Concept Videos

Dry Friction01:30

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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.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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When a solid cylinder rolls steadily on a rigid surface, the normal force applied by the surface on the cylinder is perpendicular to the tangent at the contact point. However, since no materials are entirely rigid, the surface's reaction to the cylinder involves a range of normal pressures.
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Characteristics of Dry Friction01:21

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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.
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Rolling Resistance: Problem Solving01:17

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Photothermal COFs with donor-acceptor structure for friction reduction and antiwear.

Peiwei Gong1,2, Bairen Wang1, Junyao Li1

  • 1Key Laboratory of Catalytic Conversion and Clean Energy in Universities of Shandong Province, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China. gongpeiwei10@mails.ucas.ac.cn.

Chemical Communications (Cambridge, England)
|May 10, 2024
PubMed
Summary
This summary is machine-generated.

A novel donor-acceptor covalent organic framework (COF) shows excellent photothermal conversion and dispersibility in oils. This material enables responsive friction reduction and long-lasting lubrication with superior antiwear properties.

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Area of Science:

  • Materials Science
  • Tribology
  • Nanotechnology

Background:

  • Developing advanced lubricants is crucial for reducing friction and wear in mechanical systems.
  • Photothermal conversion materials offer potential for responsive lubrication under external stimuli.

Purpose of the Study:

  • To synthesize and characterize a novel donor-acceptor covalent organic framework (COF).
  • To evaluate the COF's performance as a lubricant additive for friction reduction, antiwear, and long-time lubrication.
  • To investigate the COF's photothermal conversion properties and their influence on lubrication.

Main Methods:

  • Synthesis of a donor-acceptor structured COF.
  • Characterization of the COF's structure, dispersibility, and photothermal properties.
  • Tribological testing of the COF as an additive in various oils under different conditions.

Main Results:

  • The novel COF exhibits excellent photothermal conversion efficiency.
  • The COF demonstrates good mono-dispersity in various oils without modification.
  • The COF additive significantly reduces friction and wear, providing long-lasting lubrication.

Conclusions:

  • The developed donor-acceptor COF is a promising material for advanced lubrication applications.
  • Its unique structure and photothermal properties enable responsive and efficient friction reduction.
  • This work opens new avenues for designing functional materials for tribological systems.