The research was described in a paper entitled “Fully 3D Printed Multi-Material Soft Bio-Inspired Whisker Sensor for Underwater-Induced Vortex Detection,” which you can read here. The artificial whisker was 3D printed with polyurethane as well as graphene, which was printed in four patterns using a multi-head 3D printer.
“The four graphene patterns (90° apart) on the polyurethane cylinder enable the flow detection in all directions (0–360°). The length and diameter of the polyurethane cylinder and graphene patterns are 160 × 8 mm and 60 × 0.3 mm, respectively,” the researchers explain. “The conductivity of the printed graphene pattern is 0.6 Ω-cm. With a maximum deformation distance of 5 mm in any direction (0–360°), a substantial change in resistance is observed (from 5.09 × 103 to 6.03 × 108 Ω). The change in resistance in four directions (up, down, left, and right) is studied in an underwater environment.”
The clockwise and counter-clockwise vortices were generated by using an artificial fish fin, also 3D printed. The highly sensitive whisker sensor is the first to be 3D printed out of polyurethane and graphene. The dual-extruder 3D printer was used to print the sensor itself, using the first head, out of polyurethane purchased from Fotopolymer, while the second head printed the graphene patterns from filament bought from Black Magic 3D. After printing was complete, the base and the patterns were connected using copper tape. Copper tape was also used to solder signal wires, and a final 1mm water protection polyurethane layer was dip coated and cured with UV light.
“This paper is a wonderful example of bioinspired soft robotics,” said Barry A. Trimmer, PhD, Editor-in-Chief of Mary Ann Liebert, Inc., which published the study. “The authors have used observations of a natural system to build a materials-based sensor that can be used on underwater robots for better positional control, navigation, and object detection.”
Authors of the paper include Jahan Zeb Gul, Kim Young Su, and Kyung Hyun Choi.
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[Images: Mary Ann Liebert, Inc.]