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Related Concept Videos

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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Characteristics of Dry Friction01:21

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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.
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Kinetic Friction01:26

Kinetic Friction

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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...
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Related Experiment Video

Updated: May 5, 2026

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
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Switching friction with thermal- responsive gels.

Yang Wu1, Meirong Cai, Xiaowei Pei

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China; University of Chinese Academy of Sciences, Beijing, 100039, China.

Macromolecular Rapid Communications
|November 20, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed thermosensitive graphene oxide (GO)/poly(N-isopropyl acrylamide) (pNIPAM) hydrogels with tunable friction. These smart hydrogels exhibit ultra-low friction when swollen and high friction when shrunk, reversibly switching with temperature changes for intelligent equipment applications.

Keywords:
graphene oxideswitchable frictionthermal-responsive hydrogel

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Thermal Scanning Conductometry TSC as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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Area of Science:

  • Materials Science
  • Polymer Science
  • Tribology

Background:

  • Thermosensitive hydrogels, such as poly(N-isopropyl acrylamide) (pNIPAM), exhibit volume phase transitions in response to temperature.
  • Graphene oxide (GO) is a 2D material with unique properties that can be incorporated into polymer matrices.
  • Understanding the tribological behavior of smart materials is crucial for developing advanced functional devices.

Purpose of the Study:

  • To prepare and characterize thermosensitive graphene oxide (GO)/poly(N-isopropyl acrylamide) (pNIPAM) composite hydrogels.
  • To investigate the tribological properties of these hydrogels under varying temperature conditions.
  • To explore the potential applications of these stimuli-responsive hydrogels in intelligent control equipment.

Main Methods:

  • Synthesis of GO/pNIPAM composite hydrogels.
  • Evaluation of hydrogel swelling/shrinking behavior with temperature.
  • Measurement of frictional coefficients under different temperature states (swollen vs. shrunk).
  • Investigation of reversible friction switching by temperature alteration.
  • Modification of LCST by incorporating nonthermal sensitive monomers.

Main Results:

  • GO/pNIPAM composite hydrogels exhibit thermosensitive behavior, transitioning between swollen and shrunk states.
  • Frictional coefficient is highly dependent on gel composition and ambient temperature.
  • Ultra-low friction is observed in the swollen state (below LCST), while high friction occurs in the shrunk state (above LCST).
  • The friction state can be reversibly switched multiple times by altering the temperature.
  • Incorporating nonthermal sensitive monomers allows for tuning the LCST and the friction transition point.

Conclusions:

  • Thermosensitive GO/pNIPAM hydrogels demonstrate significant and reversible changes in frictional properties with temperature.
  • These tunable frictional characteristics make them promising candidates for intelligent control equipment.
  • The ability to switch friction states based on external stimuli opens new avenues for smart material design.