Novel smart fabrics give robots a delicate grip

Robots aren’t always the most delicate of machines when handling fragile objects. They don’t have the lightness of touch of humans. But that could be about to change thanks to a new development in smart materials.

Researchers have developed a method for weaving flexible fibers that can be controlled by magnetic fields. Not only can this be used for robot hands to pick up objects like soft fruits, potato chips and worms, but it can also be used in a range of other applications. These include gloves that provide a realistic touch in virtual reality and breathable fabrics.

Creating a new smart fiber

In a paper published in the journal Nature, researchers detail how they created their smart textile, which can bend, stiffen or change its surface texture on demand. First, the team mixed tiny, soft magnetic particles (carbonyl iron) into extremely thin, flexible fibers of a polymer, LDPE (low-density polyethylene).

To overcome the challenge of making a fiber that is both thin and packed with magnetic materials, the researchers used a process called melt spinning. This high-speed technique allowed them to create fibers just 57 micrometers in diameter.

The next stage involved twisting seven of the fibers together into a helical yarn. The importance of this shape is that it can respond to a magnetic field from any direction. This is what truly sets it apart from other smart materials.

Instead of being limited to simple “on/off” reactions (like heating or stiffening when a voltage is applied), which is called scalar control, the helical shape provides the material with directional control. That means it can respond to the strength and direction of the magnetic field, which allows more sophisticated movements.

“Our work provides insights into stimuli-responsive fibrous materials, elevating them from scalar to sophisticated vector control, heralding an era of smart textile innovation,” wrote the researchers in their paper.

Real-world applications

The team created two types of fabrics from the yarn. A woven textile that is best for bending and stretching, and a cut-pile fabric that looks and feels like a soft brush. From the woven textile, they made a kind of fabric patch that automatically opens and closes tiny ventilation slits in response to a magnetic field cycling on and off. This could be used to manage sweat and heat instantly.

With the cut-pile fabric, they built a soft robotic gripper. Because the thousands of magnetic fibers can individually stiffen and mold around objects, the gripper enables robots to safely and gently pick up delicate objects.

Additionally, the researchers made a virtual reality haptic glove. When you grab a virtual object, a remote magnetic field stiffens the fibers or presses them against your skin to simulate real-world tactile sensations.

Next up for the team is to improve the materials for commercial use, ensuring they are durable and safe for comfortable, everyday clothing.

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