Researchers from MIT and Politecnico di Bari have developed electrically driven artificial muscle fibers that contract and extend like biological muscle without motors, gears, or external pumps. Each fiber contains a sealed fluid circuit and a millimeter-scale electric pump that shifts liquid between two actuators, causing one to contract while the other relaxes. The fibers are silent, scalable by bundling like natural muscle, and thin enough to distribute throughout a robotic structure rather than concentrating bulk at joints. In testing, the fibers demonstrated enough force to bend a robotic arm while remaining gentle enough for human interaction. This could one day be used for prosthetics that move with the body, exoskeletons that amplify human strength, and humanoid robots that move more naturally than current servo-driven systems. Study: “Electrofluidic fiber muscles” published in Science Robotics DOI: 10.1126/scirobotics.ady6438

MIT researchers just replicated human muscles. They did it with tiny fibers filled with electrically charged fluid. Inside each fiber is a sealed tuba fluid and a tiny electric pump that pushes it back and forth with no moving parts. When the pump activates, one side of the fiber contracts while the other relaxes exactly how your biceps and triceps work together when you bend your arm. The pump generates pressure by injecting electrical charge into the fluid creating ions that drag the liquid along with them because they're fibers that can bundle together just like human muscles, scaling up force by adding more strands. In demonstrations, these fibers were strong enough to bend a robotic arm and curl a dumbbell, but were also gentle enough to shake someone's hand. So from prosthetics to exoskeletons to industrial robots, this is what happens when engineers stop building around motors and start building around biology. And just a quick reminder for all my videos about research like this, I include the name of the study at the bottom of the caption. So check it out below if you want to learn more. If you want to stay in the loop with the latest and air in robotics, follow for more.