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Related Concept Videos

Frictional Force01:07

Frictional Force

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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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Types of Friction Problems01:27

Types of Friction Problems

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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.
The first type of dry friction problem involves situations where there is no apparent impending motion....
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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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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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Static Friction01:18

Static Friction

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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...
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Static and Kinetic Frictional Force01:05

Static and Kinetic Frictional Force

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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.
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Experimental Multiscale Methodology for Predicting Material Fouling Resistance
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Nonmonotonic Effects of Atomic Vacancy Defects on Friction.

Lina Zhang1, Weibin Chen2, Xinfeng Tan1

  • 1State Key Laboratory of Tribology in Advanced Equipment, Tsinghua University, Beijing 100084, China.

ACS Applied Materials & Interfaces
|September 18, 2023
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Summary

Defects like tellurium (Te) vacancies in molybdenum ditelluride (MoTe2) non-monotonically affect friction. This is due to changes in sliding energy barriers and tip position, impacting solid lubricant performance.

Keywords:
MoTe2defectfrictionfriction modulationphase transitionvacancy

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Area of Science:

  • Materials Science
  • Tribology
  • Condensed Matter Physics

Background:

  • Two-dimensional (2D) materials are crucial solid lubricants.
  • Defects, such as vacancies, significantly alter their tribological properties.

Purpose of the Study:

  • To investigate the nonmonotonic effect of tellurium (Te) vacancy defects on the friction of molybdenum ditelluride (MoTe2).
  • To elucidate the underlying mechanisms governing the relationship between defect density and friction in MoTe2.

Main Methods:

  • Experimental atomic force microscopy (AFM) to measure friction.
  • Molecular dynamics (MD) simulations to analyze energy barriers and atomic interactions.

Main Results:

  • Friction generally increases with Te vacancy density but exhibits nonmonotonic behavior.
  • Increased friction is linked to higher sliding energy barriers encountered by the tip.
  • Nonmonotonicity arises from variations in the maximum sliding potential barrier due to tip position changes perpendicular to sliding.

Conclusions:

  • Te vacancy defects influence MoTe2 friction through altered energy barriers and charge distribution.
  • Tip position variation during sliding is key to the nonmonotonic friction response.
  • Understanding these mechanisms allows for tuning the frictional properties of MoTe2 as a solid lubricant.