TY  - JOUR
A1  - Yuan, Jinkai
A1  - Neri, Wilfrid
A1  - Zakri, Cecile
A1  - Merzeau, Pascal
A1  - Kratz, Karl
A1  - Lendlein, Andreas
A1  - Poulin, Philippe
T1  - Shape memory nanocomposite fibers for untethered high-energy microengines
JF  - Science
N2  - Classic rotating engines are powerful and broadly used but are of complex design and difficult to miniaturize. It has long remained challenging to make large-stroke, high-speed, high-energy microengines that are simple and robust. We show that torsionally stiffened shape memory nanocomposite fibers can be transformed upon insertion of twist to store and provide fast and high-energy rotations. The twisted shape memory nanocomposite fibers combine high torque with large angles of rotation, delivering a gravimetric work capacity that is 60 times higher than that of natural skeletal muscles. The temperature that triggers fiber rotation can be tuned. This temperature memory effect provides an additional advantage over conventional engines by allowing for the tunability of the operation temperature and a stepwise release of stored energy.
Y1  - 2019
U6  - https://doi.org/10.1126/science.aaw3722
SN  - 0036-8075
SN  - 1095-9203
VL  - 365
IS  - 6449
SP  - 155
EP  - 158
PB  - American Assoc. for the Advancement of Science
CY  - Washington
ER  -