Scientists are working to perfect small robots that can perform a job at the same time in order to complete tasks on a larger scale. The Georgia Institute of Technology has developed a 3D printed micro-robot. These micro-robots may one day work in groups to sense changes in the environment, move materials, and may one day repair damage in the human body.
The prototype robot is designed to respond to different vibration frequencies according to its configuration. The different vibrations they respond to allow researchers to control each robot by adjusting the vibration frequency. The tiny robot is only two millimeters long, about the size of the smallest ant in the world.
Despite their small size, this micro-robot can move four times its length in one second. The robot has a piezoelectric actuator bonded to a polymer body, which is 3D printed using two-photon polymerization lithography. The small actuator generates vibration and is externally powered because there is not a small enough battery installed on the robot. Vibration can come from piezoelectric vibrators under the surface where the robot is moving. The vibration will move the elastic legs of the robot's legs up and down, thereby pushing the robot forward. The amplitude of vibration controls how fast the robot moves.
This micro-robot is manufactured in a 3D printer on a polymer monomer resin material using the TPP process. After the resin block part irradiated with ultraviolet rays is chemically treated, the remaining part can be washed away, leaving the robot structure. In addition, piezoelectric actuators can also generate voltages when vibrating, allowing sensors to operate on the device.
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