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Related Concept Videos

Characteristics of Dry Friction01:21

Characteristics of Dry Friction

675
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...
675
Dry Friction01:30

Dry Friction

462
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...
462
Types of Friction Problems01:27

Types of Friction Problems

631
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.
The first type of dry friction problem involves situations where there is no apparent impending motion....
631
Frictional Force01:07

Frictional Force

8.3K
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...
8.3K
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

16.1K
One of the simpler characteristics of sliding friction is that it is parallel to the contact surfaces between systems, and is always in a direction that opposes the motion or attempted motion of the systems relative to each other. If two systems are in contact and moving relative to one another, then the friction between them is called kinetic friction. For example, kinetic friction slows a hockey puck sliding on ice.
However, if two systems are in contact and are stationary relative to one...
16.1K
Kinetic Friction01:26

Kinetic Friction

1.0K
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...
1.0K

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

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Electrotunable friction with ionic liquid lubricants.

Fernando Bresme1, Alexei A Kornyshev2, Susan Perkin3

  • 1Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, London, UK. f.bresme@imperial.ac.uk.

Nature Materials
|June 27, 2022
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Summary
This summary is machine-generated.

Researchers are exploring electronanotribology, using ionic liquids to control nanoscale friction on demand. This emerging field offers exciting possibilities for tunable friction but requires further investigation.

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Area of Science:

  • Tribology
  • Nanotechnology
  • Materials Science

Background:

  • Room-temperature ionic liquids and organic solvent mixtures show promise as lubricants.
  • Electrical polarization of sliding surfaces offers nanoscale control over lubricity.
  • Electronanotribology is an emerging field for in situ friction control.

Purpose of the Study:

  • To provide an overview of the emerging field of electronanotribology.
  • To review the current state of research, including achievements and challenges.
  • To discuss future applications of electrotunable friction.

Main Methods:

  • Review of non-equilibrium molecular dynamics simulations.
  • Analysis of experimental data from atomic force microscopy.
  • Examination of results from surface force apparatus experiments.

Main Results:

  • Ionic liquids enable nanoscale control of friction through electrical polarization.
  • Electronanotribology allows for on-demand control of friction.
  • Significant progress has been made in simulations and experimental techniques.

Conclusions:

  • Electronanotribology has the potential for in situ friction control.
  • Further research is needed to overcome current challenges.
  • Future applications of electrotunable friction are promising.