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Related Concept Videos

Frictional Force01:07

Frictional Force

9.3K
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...
9.3K
Static Friction01:18

Static Friction

1.2K
Static friction is a force that opposes the relative motion or tendency of motion between two surfaces in contact. It plays a crucial role in our daily lives, from walking on the ground to driving a car.
For example, consider a scenario where a truck is connected to a car by a rope, ready to tow it along a road. When no external force is applied by the truck, the car remains stationary and is said to be in static equilibrium. In this case, the forces acting on the car, such as gravity and the...
1.2K
Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

23.4K
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...
23.4K
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

867
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...
867
Dry Friction01:30

Dry Friction

746
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...
746
Friction: Problem Solving01:21

Friction: Problem Solving

418
Friction is an essential force that influences the motion of objects in daily life. Depending on the situation, it can be either beneficial or problematic. Consider a bus with a mass of three megagrams and its center of mass at a specific point, moving along a banked road at a constant speed. The coefficient of static friction between the tires and the road is 0.5. Find the maximum angle of the banked road at which the bus would not slip or tip.
Initially, a visual representation of the...
418

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Development of a 3D Graphene Electrode Dielectrophoretic Device
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Development of a 3D Graphene Electrode Dielectrophoretic Device

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Friction force reduction for electrical terminals using graphene coating.

Suki N Zhang1, Babak Arfaei2, Zhihong Chen1

  • 1School of Electrical and Computer Engineering & Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, United States of America.

Nanotechnology
|October 2, 2020
PubMed
Summary
This summary is machine-generated.

Graphene coatings significantly reduce friction and wear on electrical terminals, maintaining electrical conductivity. This solid lubricant enhances terminal durability through repeated use and harsh environmental testing.

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Area of Science:

  • Materials Science
  • Tribology
  • Surface Engineering

Background:

  • Electrical terminals experience wear and friction during engagement.
  • Maintaining electrical conductivity while reducing friction is crucial for terminal performance.
  • Graphene is a promising material for solid lubrication applications.

Purpose of the Study:

  • To investigate the effectiveness of multi-layer graphene coatings on electrical terminals.
  • To evaluate the impact of graphene on friction, wear, and electrical resistance during cyclic insertion.
  • To assess the durability of graphene coatings under environmental stress.

Main Methods:

  • Graphene coating via plasma-enhanced chemical vapor deposition on gold and silver terminals.
  • Friction testing using dry sliding and cyclical insertion.
  • Characterization using scanning electron microscopy, four-probe resistance, lateral force microscopy, and Raman spectroscopy.
  • Environmental testing including high humidity and thermal cycling.

Main Results:

  • Graphene coatings reduced insertional forces by up to 79% on gold and 32% on silver terminals after 10 cycles.
  • Electrical resistance remained largely unchanged with graphene coating.
  • Graphene coatings demonstrated excellent durability, surviving environmental tests with minimal degradation.

Conclusions:

  • Multi-layer graphene acts as an effective conductive solid lubricant for electrical terminals.
  • Graphene coatings significantly improve the wear resistance and reduce friction of electrical terminals.
  • Graphene-coated terminals exhibit enhanced reliability and longevity under operational and environmental stresses.