MIT Develops Artificial 'Muscles' Based on Fibers
MIT researchers have come up
with a fiber based artificial 'muscle' system that can be used for robots,
prosthetic limbs, or other mechanical and biomedical applications.
The new fibers were developed
by MIT postdoctoral student Mehmet Kanik
and MIT graduate student Sirma Örgüç, working with professors Polina Anikeeva,
Yoel Fink, Anantha Chandrakasan, and C. Cem TaÅŸan, and five others, using a
fiber-drawing technique to combine two dissimilar polymers into a single strand
of fiber.
The key to the process is
mating together two materials that have very different thermal expansion
coefficients — meaning they have different rates of expansion when they are
heated. This is the same principle used in many thermostats, for example, using
a bimetallic strip as a way of measuring temperature. As the joined material
heats up, the side that wants to expand faster is held back by the other
material. As a result, the bonded material curls up, bending toward the side
that is expanding more slowly.
The new fiber based technology was developed observing how
plants grows upward to get more sunlight and exposure as possible.
Source: http://news.mit.edu/2019/artificial-fiber-muscles-0711
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