Suspension Printing And Performance Research Of Light-guiding Wavelength Controlled Photothermal Actuator

Photoconductive photothermal microactuators with controllable wavelength signals refer to the use of photothermal conversion materials to prepare actuators with different responses at different wavelengths,and are applied in both industry and medicine.Light-driven microactuators which are based on photostrain phenomena are developing rapidly and become a key component of light-driven bionic robots,so light-driven microactuators have been studied and used by many scholars in the fields of bionic robotics and biomedicine.This paper discusses the background of the light-driven microactuator.It simulates and analyses strain characteristics of the microactuator.The main research includes the analysis of the principle of light-guided transmission,the design of two structures for testing—U-shaped actuator,Y-shaped heterogeneous actuator,and the principle simulation of the strain characteristics of these three structures of actuators using finite element analysis(FEA);followed by the exploration of the hydrogel support printing preparation process based on experiments.The corresponding actuator prototypes were successfully fabricated with smooth surface morphology and high mechanical strength.Finally,a comprehensive test platform was built to test and analyse the prepared actuators,and the strain characteristics and temperature variations of the actuators were accurately described.A 200 μm needle inner diameter was used to achieve a uniform extrusion line profile and keep the defective products below 25%.The performance study of the light-guided actuator shows that at an excitation light power of 100 m W,for the U-shaped actuator coated with narrow-band absorbing material,the actuator displacement of the actuator coated with the corresponding narrow-band absorbing material can reach 160 μm respectively,Drive displacement ratio is 80%,while the maximum drive displacement of the actuator coated with non-corresponding narrow-band absorbing material is less than 25 μm,while for the Y-shaped actuator,the strategy of driving both double arms and only single arm is used.It was demonstrated that the maximum drive displacement of the specified arm could reach 150 μm under 100 m W power excitation,demonstrating the effectiveness of the selective drive strategy for photothermal conversion of narrow-band absorption and achieving larger drive distances than conventional polymer actuators driven by ambient light irradiation.