Fabrication Of The Stimuli-Responsive Smart Device And A Research Of Smart Materials For Micro-Driven

With the development of materials science, the responsive smart materials have attracted more and more people’s attention, but there have been many problems in its controllability and applications, such as combination of responsive materials, conversion issues in situ, and other application problems. In this paper, we fabricated a stimuli-responsive smart device by combining three intelligent materials together, and achieved combination of responsive materials which could complete complex tasks, reach the nickel mesh of pH-responsive conversion in situ, and promot the cross between different disciplines. Moreover, we studied The application of smart materials in devices’ micro oThe main contents of the paper as following:(1) We have fabricated a functionally cooperating minirobot by integrating a drag-reducing nanocoating, a hydrogen peroxide responsive surface, and a pH responsive surface, whose locomotion can be switched on and off in situ in response to pH changes.In this mini-system, the locomotion of the minirobot occurs due to three parties, including the superhydrophobic boat, H2O2responsive gold substrate, pH-responsive nickel mesh. First, the superhydrophobic nickel foam boat surface with roughness was modified by low surface energy materials (HS(CH2)11CH3) to get the superhydrophobic characteristic, and could generate gas film to reduce the resistance when it contacts with water.. Second, the H2O2responsive gold substrate’s surface which was covered the rough platinum layers could catalyze hydrogen peroxide decomposition rapidly to releases oxygen. As movement energy, oxygen drove the system movement. Thus, we completed the process of intelligent materials driving micro-divice. Third, the pH-responsive nickel mesh was modified by the mixed thiol on its surface which had the abilities of responding pH and could controlled wettability of the nickel mesh by pH. The present work promotes research on nanomaterials from active nanostructures to integrated nanosystems. This is the first example of integrating three kinds of functional nanomaterials into one minirobot in a cooperative way.(2) The pH-responsive materials need to change the pH-value of the whole liquid environment and have a problem of long response time, so we explored the photosensitive material. We synthetized azobenzene derivatives and then the azobenzene derivatives were assembled on the substrate surface. We try to reach the wettability of the surface of the samrt materials by changing the irradiation wavelength quickly, without changing the whole liquid environment. Using a-CD solution to test wettability of substrate surface, we demonstrated that the substrate surface was hydrophobic under visible light when contacting deionized water directly, then it was hydrophilic when modified by α-CD, and it could restore hydrophobic state after UV irradiation.