Most materials we use every day—like metal, glass, or rubber—are passive. They only move or change shape when we push or pull them.
But scientists are now exploring a very different kind of material, called “active matter,” that can move and respond using its own energy.
These materials don’t just bend under pressure—they can snap, crawl, and even move on their own.
Active matter is often seen in nature.
A good example is a flock of birds flying together as if they were one single organism.
Each bird uses its own energy, but together they create complex, coordinated movement. Inspired by this, researchers have been trying to build similar systems in the lab.
An international team from the University of Amsterdam, University of Cambridge, and University of New South Wales has been experimenting with simple materials like small motors, rods, and rubber bands to create their own versions of active matter.
Their work shows that even basic components can produce surprisingly complex behavior.
To understand their idea, think about bending a thin piece of paper. If you press it from both ends, it suddenly buckles and snaps to one side.
This is a one-time reaction caused by the force you apply. But when the researchers built a similar structure using connected rods and tiny motors, something very different happened.
The motors added internal energy, allowing the structure to keep repeating the buckling and snapping motion.
Instead of just snapping once, these active chains could oscillate back and forth. Even more surprisingly, they could start to move across a surface—crawling, walking, or even digging—without any external control.
This happens because the motors make the connections between parts behave unevenly, creating motion from within the system itself.
These findings suggest a new way to design “soft robots.” Unlike traditional robots that rely on central control systems, these materials could form robot bodies that move and adapt on their own. This could lead to machines that are more flexible, resilient, and able to operate in complex environments.
The researchers also discovered something unexpected when they expanded their design into larger, grid-like structures.
In normal engineering, there is a principle called Le Chatelier’s Principle, which suggests that changes at a small scale will produce similar effects at a larger scale. For example, making parts of a structure stiffer usually makes the whole structure stiffer.
But active matter does not always follow this rule. When the scientists increased the activity of individual parts, the overall structure sometimes became less responsive instead of more. They found that the key factor was how well the active components were connected throughout the material. If the structure was too dense, the effects could not spread properly—similar to how water struggles to pass through tightly packed coffee grounds.
This research opens the door to a new generation of materials that behave more like living systems than traditional objects. As scientists continue to explore active matter, we may soon see materials that can move, adapt, and perform tasks on their own, transforming fields from robotics to medicine.
Source: KSR.
