Publications by authors named "Defeng Yan"
Wearable sensors have attracted considerable interest due to their ability to detect a variety of information generated by human physiological activities through physical and chemical means. The performance of wearable sensors is limited by their stability, and endowing wearable sensors with superhydrophobicity is one of the means to enable them to maintain excellent performance in harsh environments. This review emphasizes the imperative progress in flexible superhydrophobic sensors for wearable devices.
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- Carbon fibre-reinforced plastic (CFRP) composites have excellent properties but face surface quality problems during slotting due to their complex structure.
- The study investigates these slotting challenges using multi-tooth mills and varying fibre orientations and tool feed rates, showing that both greatly affect cutting forces and surface roughness.
- Results reveal significant differences in performance between up-milling and down-milling techniques, with cutting forces and surface quality varying based on local fibre cutting angles and tool feed rates.
Superhydrophobic nickel surfaces have significant advantages in the field of corrosion protection compared with traditional nickel corrosion protection methods which need a toxic chemical corrosion inhibitor. Electrochemical etching, an ideal method for fabricating superhydrophobic nickel surfaces, was also limited by low current density, resulting in low processing efficiency. To overcome this limitation, we proposed a new method to fabricate a superhydrophobic nickel surface using a wire electrochemical etching method.
View Article and Find Full Text PDFPassive-cooling building materials can achieve cooling without external energy consumption, which is an energy-saving and environmentally friendly cooling method. However, the existing passive-cooling building materials have the limitations of high cost, complicated processes, and a toxic organic solvent, which hinders the passive-cooling technology applied in practical building. To overcome these limitations, we developed a facile, high-efficiency, non-toxic, and superhydrophobic passive-cooling building coating (SPCBC) with an efficient cooling capability and excellent durability that was composed of polydimethylsiloxane and SiO.
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- Spontaneous and directional water transportation (SDWT) is a promising method for efficient water movement, especially in aerospace and maritime applications, but current models suffer from slow speeds due to structural limitations.
- A new superhydrophilic serial cycloid-shaped pattern (SSCP), inspired by the Nepenthes plant, significantly improves water transportation speed, surpassing traditional designs.
- Tests revealed the SSCP can achieve a velocity of 289 mm/s and excel in long-distance transport, heat transfer, and even fog collection, indicating great potential for advanced fluid transport systems.
Freshwater scarcity crisis threatens human life and economic security. Collecting water from the fog seems to be an effective method to defuse this crisis. Nonetheless, the existing fog collection methods have the limitations of the low fog collection rate and efficiency because of their gravity-based droplet shedding.
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