Scientists have developed a new hydrogel that stretches and contracts just like an artificial muscle. The team created an L-shaped object made out of the hydrogel and immersed it in a water bath. When the water’s temperature was varied, it slowly "walked" forward.
All living organisms – human, animal, or otherwise – continuously move molecules around their cells. It's a crucial mechanism of life, vital for feeding cells the proteins they need to function. And now scientists at Northwestern University have created a machine that mimics this pumping mechanism. Their molecular pump is the world's first such machine developed entirely through chemical engineering in the laboratory, and it could one day power artificial muscles and other molecular machines.
Artificial muscles could one day revolutionize fields such as robotics,
prosthetics and nanotechnology. So far, we've seen examples made from
materials like electroactive elastomers, crumpled graphene, and vanadium dioxide.
The problem is, most artificial muscles can only expand in one
direction, or contract in the other. Now, however, scientists from
National Taiwan University have gotten around that limitation using
gold-plated onion cells.