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Rolling With Slipping01:14

Rolling With Slipping

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Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
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Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
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When designing a water slide, controlling the speed of water flow is crucial for rider safety while maintaining an exciting experience. As water flows down the slide, gravity causes it to accelerate, with its speed at the bottom depending on the height from which it starts. The higher the slide, the more potential energy the water has at the top, which is converted into kinetic energy as it descends, increasing its speed.
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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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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.
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Related Experiment Video

Updated: Sep 6, 2025

Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
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Controllable Droplet Sliding on a Smart Shape-Memory Slippery Surface.

Yaoxu He1, Zhe Wang1, Xiaoyu Jiao2

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, Heilongjiang, P. R. China.

Chemistry, an Asian Journal
|June 30, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel shape memory slippery surface that controls droplet sliding without constant external stimuli. This smart surface adjusts pit structures to reversibly switch between rolling and pinning states for various liquids.

Keywords:
droplet sliding controlmicrostructure regulationshape memory polymerslippery surfaceswitchable

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Area of Science:

  • Materials Science
  • Surface Science
  • Polymer Science

Background:

  • Controllable droplet sliding on slippery surfaces is crucial for many applications.
  • Existing surfaces often require constant stimuli (heat, light, magnetic fields) for control.
  • There is a need for smart surfaces with intrinsic, stimulus-responsive droplet manipulation capabilities.

Purpose of the Study:

  • To develop a shape memory slippery surface for controllable droplet sliding.
  • To overcome the limitation of constant external stimuli in existing slippery surfaces.
  • To explore the relationship between surface microstructure and droplet behavior.

Main Methods:

  • Constructing pit structures on a shape memory polymer substrate.
  • Infusing the pit structures with low surface tension oil.
  • Utilizing the shape memory effect to alter pit size and surface microstructure.
  • Investigating droplet sliding performance (rolling and pinning states) for water and organic liquids.

Main Results:

  • The shape memory polymer surface successfully memorized diverse pit sizes upon stretching and recovery.
  • Droplet sliding behavior (water and organic liquids) was reversibly tuned between rolling and pinning states.
  • The surface demonstrated smart, stimulus-free control of droplet dynamics via microstructural changes.

Conclusions:

  • Shape memory polymers offer a novel platform for creating intelligent slippery surfaces.
  • Regulating surface microstructure via the shape memory effect enables precise control over droplet sliding.
  • This approach provides a new strategy for droplet manipulation and design of advanced smart surfaces.