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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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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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Relation Between the Distributed Load and Shear01:23

Relation Between the Distributed Load and Shear

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Understanding the relationship between the distributed load and shear force in structural analysis is crucial for analyzing beams subjected to various loading conditions. Consider the case of a beam experiencing a distributed load, two concentrated loads, and a couple moment.
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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
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Relation between interfacial shear and friction force in 2D materials.

Martin Rejhon1, Francesco Lavini1, Ali Khosravi2,3,4

  • 1Department of Chemical and Biomolecular Engineering, Tandon School of Engineering, New York University, Brooklyn, NY, USA.

Nature Nanotechnology
|November 1, 2022
PubMed
Summary

The interfacial shear modulus of atomic layers on substrates is crucial for electronic and mechanical properties. This study reveals its critical dependence on stacking order and interaction, enabling friction prediction in 2D materials.

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Area of Science:

  • Materials Science
  • Tribology
  • Condensed Matter Physics

Background:

  • Interfacial properties of atomic layers on substrates are fundamental to electronic, mechanical, and chemical characteristics.
  • Controlling phenomena like Fermi level pinning, strain engineering, and superlubricity relies on understanding these interactions.

Purpose of the Study:

  • To measure the interfacial transverse shear modulus of atomic layers on substrates.
  • To investigate the influence of stacking order, substrate interaction, and intercalated species on this modulus.
  • To establish the relationship between interfacial shear modulus and sliding friction in two-dimensional materials.

Main Methods:

  • Experimental measurements of interfacial transverse shear modulus on bulk graphite and epitaxial graphene films on SiC.
  • Variations in stacking order, twisting, and the presence of intercalated hydrogen were explored.
  • Friction force measurements and simulations using simplified friction models.

Main Results:

  • The interfacial transverse shear modulus is critically dependent on stacking order and the atomic layer-substrate interaction.
  • A reciprocal relationship was demonstrated between friction force per unit contact area and interfacial shear modulus.
  • Simulations confirmed that atomic layer-substrate interaction dictates shear stiffness and friction dissipation.

Conclusions:

  • The interfacial transverse shear modulus is a pivotal, measurable property for controlling and predicting sliding friction in supported 2D materials.
  • Stacking order and atomic layer-substrate interactions are key determinants of interfacial shear modulus.
  • Understanding this modulus offers insights into friction mechanisms in layered materials.