Researchers at Georgia Institute of Technology and Ohio State University have developed a new soft polymer material. This material is called a magnetic shape memory polymer. It can be transformed into various shapes using magnetic fields. The research team believes that this new material may have a range of new applications, from antennas that dynamically change frequencies to grippers for handling small or heavy objects.
This new material is made with a mixture of three ingredients, all of which have unique characteristics. This mixture includes two types of magnetic particles, one for the induction of heat and the Other with a strong magnetic attraction. The third type is shape memory polymer, which helps to lock various shapes in place.
The resulting material can quickly change shape and lock shape, and can be reprogrammed into other shapes. Researchers began to make this material by distributing NdFeB and iron oxide particles into a mixture of shape memory polymers. When the particles were fully incorporated, the researchers molded the mixture into various objects to evaluate the material's performance in a range of applications.
The team made a gripper using a T-shaped mold of polymer mixture. The application of a high-frequency oscillating magnetic field heats the iron oxide particles and heats the entire fixture. An increase in temperature causes the polymer to soften and become soft. Then, the application of a second magnetic field causes the gripper to open and close. The deformation process takes only a few seconds from start to completion. The material in the locked state is strong enough to allow the gripper to lift an object whose weight is 1,000 times its own weight.
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