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Abstract
Mechanically responsive materials are promising as next-generation actuators for soft robotics, but have scarce reports on the statistical modeling of the actuation behavior. This research reports on the development and modeling of the photomechanical bending behavior of hybrid silicones mixed with azobenzene powder. The photo-responsive hybrid silicone bends away from the light source upon light irradiation when a thin paper is attached on the hybrid silicone. The time courses of bending behaviors were fitted well with exponential models with a time variable, affording fitting constants at each experimental condition. These fitted parameters were further modeled using the analysis of variance (ANOVA). Cubic models were proposed for both the photo-bending and unbending processes, which were parameterized by the powder ratio and the light intensity. This modeling process allows such photo-responsive materials to be controlled as actuators, and will possibly be effective for engineering mechanically responsive materials.
Highlights
The word “robot” was born in a play written by Karel Čapek nearly a hundred years ago [1]
When a strip-shaped hybrid silicone of 10 wt% free to expand was irradiated by UV light from the front side, the hybrid silicone just elongated along the length and did not exhibit noticeable bending (Figure 2a)
We fabricated hybrid silicones mixed with azobenzene powder, and enabled them to bend under
Summary
The word “robot” was born in a play written by Karel Čapek nearly a hundred years ago [1]. Robots have been utilized in many industries owing to their automated and precise manipulations, planting the impression that robots have hard bodies. In contrast to hard-bodied robots, soft robotics has emerged as a research field, because soft-bodied robots, which are basically made of polymers, are adaptable to their external environment, enabling safe human contact and grip objects [2]. The working mechanism of soft robots is mostly based on pneumatic pressure due to the advantage of large output force [3,4]. Pneumatic actuation requires a large pressure pump, and is sometimes difficult to downscale (especially valves). As expectations for soft robots are increasing, the development of new soft actuation systems will lead to diversifying types of soft robots working in different environments
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