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Shape-Shifting Ink Could Revolutionize Flexible Electronics
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by Anya Schmidt | SEOUL – 2025/07/01 13:43:47
Imagine a future where gadgets seamlessly adapt to your needs, from phones that bend to fit your pocket to medical implants that soften inside the body. Thanks to researchers in South Korea, this vision may soon become reality.
Scientists at KAIST and Seoul National University have created an “electronic ink” that allows circuits to transition between hard and soft states simply by changing the temperature. This innovation promises a new era of flexible electronics that can dynamically adjust their stiffness based on the application.
How the Shape-Shifting Ink Works
The key component is gallium, a metal that remains solid at room temperature but melts just below body temperature.The researchers combined tiny gallium particles with a flexible polymer and a solvent to form a stable ink that can be applied using standard printing methods, including screen printing. When the printed circuit is heated,the solvent evaporates,causing the ink to become conductive and change its stiffness,resulting in circuits that can switch between a plastic-like hardness and a rubbery softness.
Why This Innovation Matters
Current electronics are typically either rigid (smartphones, laptops) or soft (fitness bands, wearables).Rigid devices offer durability and power but lack comfort and adaptability. Soft devices are flexible but can be challenging to manufacture with high precision. This new ink overcomes these limitations, enabling devices to alternate between being tough and flexible as needed.
“This opens up new possibilities for future personal electronics, medical devices and robotics.”
The research team demonstrated two functional prototypes. The first is a wearable health device that is firm at room temperature but softens upon contact with the skin for enhanced comfort. The second is a brain implant that remains rigid for accurate placement during surgery and then softens inside the body to minimize irritation.
