研究目的
To develop a light-driven swimmer at the liquid/air interface with on-demand control of motion, addressing issues like fuel dependence, motion control difficulty, and high temperature in conventional devices.
研究成果
The photo-driven bilayer swimmer exhibits fast, reversible, and controllable motion at the liquid/air interface, mimicking dolphin-like swimming. It achieves on-demand directional control, works at room temperature, and shows potential for miniaturized transportation applications. Future work could focus on improving design for better stability and exploring biocompatible uses.
研究不足
The study is limited to specific liquid mixtures (e.g., ethanol/water) and may not perform well in pure water due to high density and surface tension. The mechanical properties and reversibility of the LCN layer could be further optimized. Theoretical proof for the linear relationship between light intensity and deformation is needed. Applications are constrained to room temperature and may not be suitable for high-temperature environments.
1：Experimental Design and Method Selection:
A bimorph composite structure was designed using a photoresponsive liquid-crystalline polymer network (LCN) layer and a polyimide (Kapton) layer. The method involves photoirradiation with UV light to induce reversible bending and motion.
2：Sample Selection and Data Sources:
Samples were cut into rectangular strips (e.g.,
3：0 cm × 0 mm) and squares (e.g., 0 mm × 0 mm) from the bilayer film. Data on deformation, force, displacement, and velocity were collected under controlled UV irradiation. List of Experimental Equipment and Materials:
Materials include azobenzene-containing LCN, Kapton polyimide film, ethanol/water mixture (50% volume ratio), and UV light source. Equipment includes tensile test machine, scanning electron microscope (SEM), optical microscope, and infrared imaging camera.
4：Experimental Procedures and Operational Workflow:
The bilayer film was fabricated and cut into shapes. UV light was applied periodically (e.g.,
5：1 Hz frequency) to induce bending and motion on liquid surfaces. Motion was observed and recorded, with changes in light intensity and irradiation site to control velocity and direction. Data Analysis Methods:
Data on photoinduced force, deformation angle, displacement, and velocity were analyzed. Fitted curves based on motion models were used, and statistical analysis was performed to relate light intensity to mechanical responses.
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