APPLICATIONS OF TECHNOLOGY:
- Microelectromechanical systems (MEMS)
- Drug delivery
- Artificial muscles
- Smart and adaptive materials
- High amplitude, high speed, and high force actuation
- Operates in ambient or aqueous conditions
- Energy efficient
- Made of nontoxic and abundant materials
- High stability and durability
- Easily scalable and customizable
Berkeley Lab researchers Junqiao Wu, Kai Liu, and Kevin Wang have developed a powerful new microscale actuator that simultaneously achieves high amplitude, high work output, and high speed in both air and water. In fact, this technology is the first to exceed performance limits in amplitude, force, and speed of standard microactuators and piezoelectric devices.
The Berkeley Lab microactuator is made of bimorph structures based on vanadium dioxide, an advanced material that responds to heat, electric current, and light. In both ambient and aqueous conditions, the actuators bend with exceedingly high
- displacement-to-length ratios, on the order of 1 in the sub-100 μm length scale, and
- work densities, 0.63 - 7.0 J/cm3,
at frequencies up to 6 kHz.
Microactuators are essential for converting external stimuli, such as heat, electricity, and light, into mechanical motion in such advanced technologies as MEMS and artificial muscles. The Berkeley Lab technology’s integrated designs of two- or three-dimensional geometries are customizable for these applications as well as for microfluidics used in drug delivery systems.
DEVELOPMENT STAGE: Proven principle.
STATUS: Patent pending. Available for licensing or collaborative research.
FOR MORE INFORMATION:
Kai Liu , Chun Cheng , Joonki Suh , Robert Tang-Kong , Deyi Fu , Sangwook Lee ,
Jian Zhou , Leon O. Chua ,and Junqiao Wu, "Powerful, Multifunctional Torsional Micromuscles Activated by Phase Transition," Advanced Materials, 2013.
Hatt, Alison, “Flexing fingers for micro-robotics: Berkeley Lab scientists create a powerful, microscale actuator,” Berkeley Lab News Center, December 17, 2012.
Kevin Wang, Chun Cheng, Edy Cardona, Jingyang Guan, Kai Liu, Junqiao Wu, “Performance limits of micro-actuation with vanadium dioxide as a solid engine,” ACS Nano, 7, 2266 (2013).
Kai Liu, Chun Cheng, Zhenting Cheng, Kevin Wang, Ramamoorthy Ramesh, Junqiao Wu, “Giant-Amplitude, High-Work Density Microactuators with Phase Transition Activated Nanolayer Bimorphs,” Nano Lett., 12, 6302 (2012).
SEE THESE OTHER BERKELEY LAB TECHNOLOGIES IN THIS FIELD:
Ultra High Performance MEMS / NEMS Acutators, Oscillators, and Sensors, IB-2008a, IB-2008b, JIB-2124
REFERENCE NUMBER: IB 2013-013