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Figure 1. (a), (b) Multi-functional smart coating surface topography; (c) Photomicrographs of water droplets (~3 mL) on smart coating surfaces after untreated, alkali, acid, and UV treatments; (d) Microscopic appearance of smart coating section
Figure 2. (a) Multifunctional smart coating response response; (b) Dynamic response to different frequencies; (c) Response time; (d) Cycle testing; (e) Water droplets (~3 mL) on the extended coating surface Optical photo
Figure 3. (a), (b) Real water sluice and magnetically driven “water†robots coated with a multifunctional smart coating on the “footâ€; (c) Waterproof smart sensing clothing; (d) Smart sensing gloves Water repellency; (e) Inside Cover
The superhydrophobic interface means that the contact angle of water with the surface of the material is greater than 150°, such as the legs of the lotus leaf and the lepidoptera insect commonly found in daily life. The manufacture of artificial super-hydrophobic surfaces and its wide application in the fields of waterproofing, self-cleaning, drag reduction, and selective absorption has become a research hotspot today. Stability, flexibility, and practicality are still problems that need to be solved in practical applications of superhydrophobic materials. In addition, superhydrophobic smart coatings that combine superhydrophobic materials with wearable flexible sensing applications have not been reported.
In response to the above-mentioned key scientific and technological issues, the team of Zhang Jian, a researcher at the Suzhou Institute of Nanotechnology and Nano-Bionics, Chinese Academy of Sciences constructed a multi-stage micro-nano composite structure of multi-walled carbon nanotubes (MWCNT)/thermoplastic elastomer (TPE) composite superhydrophobic. Smart coating, this coating has both super-hydrophobic and excellent strain-sensing performance, and can effectively resist water, acid, alkali, sweat and other interference in the environment. From the results of the study, thanks to the gradient distribution of the TPE and the stable micro-pore-nano-raised composite structure in the composite coating, the multifunctional coating can be combined with a flexible substrate (such as a flexible fabric, polyimide, poly Ethylene, etc.) Stable bonding can also be well combined with rigid substrates (such as glass, metal, etc.), and in line with Wenzel and Cassie models have very stable superhydrophobic properties (contact angle ~162 °); on the other hand porous micro-nano composite The structure gives the MEWCNT/TPE composite network excellent strain sensing capabilities for stretching, bending, and twisting: high sensitivity (GF: 5.4 to 80), high resolution (1° bending), fast response time (<8ms), Large strain range (maximum strain ~76%, bending angle 0° ~ 140°, twist 0-350 radm-1) and high stability (5000 large strain tensile tests). Based on the excellent performance of the smart coating, the research team realized a multi-functional application: adding magnetic iron oxide (Fe3O4) nanoparticles to the composite material to construct a magnetically driven "water" robot; forming a smart fabric to monitor human motion in real time in a full range. The study has important implications for the fields of super-hydrophobic materials, smart materials, and flexible intelligent systems. Related research results were published on Advanced Materials.
The research work was supported by the National Natural Science Foundation of China and the Jiangsu Outstanding Youth Fund Project.
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