Design of a UV-responsive microactuator on a smart device for light-induced ON-OFF-ON motion
Source abstract
Abstract
Combining a stimuli-responsive material and the Marangoni effect, a microactuator containing a ultraviolet (UV)-light-responsive photoresist and surfactant is fabricated. The locomotion of a functionally cooperating device loaded with the microactuator can be initiated by irradiation with 365 nm UV light, ceased by the removal of the UV light and restarted by re-exposure to the UV light. Moreover, the device exhibits good direction control via selective irradiation of photoresponsive microactuators at designated locations. This work is the first example using the chemical Marangoni effect to produce photoresponsive ON-OFF-ON motion of a macroscopic object on water surfaces with little impact on the experimental environment and opens up new opportunities for the design of novel advanced functional materials with controlled properties. Feng Shi and colleagues in China have fabricated a smart device that can be pushed along a water surface by the use of ultraviolet light. The researchers from Beijing University of Chemical Technology make use of the Marangoni effect, which creates a force when liquids of different surfaces tension mix — for example, during the expansion of an oil droplet on water. The device consists of a boat made from superhydrophobic metal foam. Silicon chips covered with photoresist and a surfactant are attached at the sides. Shining ultraviolet light on the chips dissolves the photoresist and releases the surfactant, which begins to spread on the surface of the water and pushes the boat. The motion can be stopped by turning the ultraviolet light off, and the direction of movement determined by using silicon chips on different sides of the boat. Combining a stimulus-responsive material and the Marangoni effect, a smart microactuator consisting of UV-responsive photoresist and surfactant was fabricated. The locomotion of a device loaded with the microactuator was initiated upon irradiation with 365-nm UV light, stopped when the light was turned off, and restarted when the light was turned back on. This work is the first example using the chemical Marangoni effect to produce photoresponsive motion on a water surface.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Micro and Nano Robotics · Advanced Materials and Mechanics · Advanced Sensor and Energy Harvesting Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (41)
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