Tiny Rotors Spin Without Electricity or Magnets

Topic: Physics

Scientists from Germany and China have found a way to make tiny rotors spin using only water. They used a special device that creates vortices in the water, which makes the rotor turn. This discovery could lead to new ways of making small structures.

A team of scientists from the Karlsruhe Institute of Technology (KIT) and the Suzhou Institute of Nano-tech and Nano-bionics (SINANO) at the Chinese Academy of Sciences has made a breakthrough in creating tiny rotors. They have found that flow at a water surface alone is enough to rotate a floating object in a fixed direction.

The researchers used a 3D-printed component with a spiral channel to keep a tiny object on the water surface without touching it. When the component moves slowly up and down, the object oscillates back and forth, but at higher speeds, small vortices form, making the object rotate in one direction.

The scientists were able to visualize this process using flow simulations. They found that the symmetry of motion is broken at higher speeds, which allows the rotor to turn. This discovery could lead to new ways of making small structures, such as silk fibers and twisted bundles.

The researchers assembled silk fibers with diameters between 10 and 20 micrometers into multilayered twisted bundles using this approach. They believe that this method could be used to make low-loss transmission cables in data centers, multifunctional suture materials, and artificial muscles.

Why It Matters

This discovery could lead to new ways of making small structures, which could have applications in fields such as medicine, technology, and energy. It also shows that scientists can find creative solutions to complex problems using simple principles.

Key Facts

• Scientists from Germany and China have found a way to make tiny rotors spin using only water.
• The researchers used a special device that creates vortices in the water, which makes the rotor turn.
• This discovery could lead to new ways of making small structures, such as silk fibers and twisted bundles.
• The researchers assembled silk fibers with diameters between 10 and 20 micrometers into multilayered twisted bundles using this approach.
• The method could be used to make low-loss transmission cables in data centers, multifunctional suture materials, and artificial muscles.

Key Terms

Vortices

Rings of water that spin around a central point

Torque

A measure of the force that makes something turn

Implications

This discovery could lead to new ways of making small structures, which could have applications in fields such as medicine, technology, and energy. It also shows that scientists can find creative solutions to complex problems using simple principles.