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Related Concept Videos

Frictional Force01:07

Frictional Force

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...
Dry Friction01:30

Dry Friction

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...
Characteristics of Dry Friction01:21

Characteristics of Dry Friction

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...
Static Friction01:18

Static Friction

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...
Kinetic Friction01:26

Kinetic Friction

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 begins...
Friction: Problem Solving01:17

Friction: Problem Solving

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...

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Related Experiment Video

Updated: Jul 3, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

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

Published on: December 24, 2014

Normal and frictional forces between surfaces bearing polyelectrolyte brushes.

Uri Raviv1, Suzanne Giasson, Nir Kampf

  • 1Department of Materials and Interfaces, Weizmann Institute of Science, Rehovot, Israel. raviv@chem.ch.huji.ac.il

Langmuir : the ACS Journal of Surfaces and Colloids
|July 23, 2008
PubMed
Summary

Hydrophobic attraction between mica surfaces was replaced by repulsion using polymer brushes. These brushes exhibited extremely low friction, demonstrating potential for advanced surface coatings and lubrication.

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In Situ High Pressure Hydrogen Tribological Testing of Common Polymer Materials Used in the Hydrogen Delivery Infrastructure

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Area of Science:

  • Polymer Science
  • Surface Chemistry
  • Tribology

Background:

  • Hydrophobized mica surfaces typically exhibit strong hydrophobic attraction in aqueous media.
  • Polyelectrolyte brushes can modify surface forces and friction.
  • Understanding interactions at the nanoscale is crucial for material design.

Purpose of the Study:

  • To investigate the forces and friction between mica surfaces modified with poly(methyl methacrylate)- block-poly(sodium sulfonated glycidyl methacrylate) (PMMA- b-PSGMA) copolymer brushes.
  • To determine the effect of polymer brush conformation and hydration on normal and shear forces.
  • To explore the potential of these brushes for reducing friction and adhesion.

Main Methods:

  • Atomic force microscopy (AFM) to measure normal and shear forces between hydrophobized mica surfaces.
  • Modification of mica surfaces with PMMA- b-PSGMA diblock copolymers.
  • Varying surface separation (D) and compression to study force-distance profiles and friction.

Main Results:

  • PMMA- b-PSGMA brushes effectively replaced hydrophobic attraction with strong normal repulsion due to osmotic and steric effects.
  • Extremely low shear forces (<30 nN) were observed, indicating superlubricity.
  • At high compression, weak shear forces increased due to viscous drag, followed by chain ejection and adhesive contact.

Conclusions:

  • Polyelectrolyte brushes are effective in controlling surface forces and achieving ultra-low friction.
  • The interplay of counterion confinement, steric repulsion, and hydration layers governs the tribological behavior.
  • These findings suggest applications in lubrication, anti-fouling coatings, and micro/nanoscale devices.