Submitted via IRC for SoyCow1984
MIT scientists 'work out' synthetic hydrogels to make them stronger
Your muscles are soft, pliable, and can resist fatigue after thousands of repetitive movements. Researchers at MIT have found a way to make synthetic hydrogels act like muscles by putting them through a vigorous workout. After being mechanically trained in a water bath, the hydrogels became pliant, soft and resistant to breakdown. A paper with the study's findings was published this week in Proceedings of the National Academy of Sciences.
They used polyvinyl alcohol hydrogels, which are common in lab settings and used for medical implants and drug coatings. The trick was to create a material that was as strong as a muscle, but which also contained a high enough water content to be pliant enough for the human body.
[...] Before exercise, the nanofibers in the hydrogels were randomly oriented. During the training process, researchers began to realize that the nanofibers in the hydrogels were actually aligning and becoming stronger. Hydrogels became strong, soft, full of water and more resistant after 1,000 stretching rounds in the water bath. A trained hydrogel was found to be 4.3 times stronger than an untrained hydrogel. Researchers hope that one day the materials can be used in implants such as "heart valves, cartilage replacements, and spinal disks, as well as in engineering applications such as soft robots."
