In cold regions, road surface icing poses a significant threat to traffic safety, leading to increased accident rates and considerable socioeconomic losses. Commonly used de-icing strategies include mechanical removal and salt spreading. Mechanical methods require substantial investment in equipment and maintenance, while salt-based approaches may have negative environmental impacts. In this study, a microwave-responsive, self-healing asphalt coating (SPMA) was developed by blending self-healing polyurethane (SP) with hydroxyl-functionalized multi-walled carbon nanotubes (MWCNT-OH) at a mass ratio of 30:1, and incorporating the composite into matrix asphalt. Under microwave irradiation, SPMA with 5 wt% SP/MWCNT composite exhibited a maximum surface temperature of 57.0 °C after 300 s, with an average temperature of 55.2 °C, indicating improved microwave heating efficiency and reduced thermal gradients. The de-icing rate of SPMA remained consistently high throughout the microwave heating test, outperforming both matrix asphalt and MWCNT-blended matrix asphalt (MA) specimens. After knife scratching, surface scratch on the specimens were nearly fully repaired within 20 h at 25 °C, indicating reliable self-healing performance due to reversible disulfide bonds. After 500 rutting abrasion cycles, the SPMA maintained both thermal responsiveness and structural integrity. The durability and skid resistance properties have been further substantiated through the 100 cycles of vehicular loading. These results suggest that SPMA holds promise for long-term de-icing applications on cold-region pavement.
The search for triboelectric materials with cost-effective synthesis methods and easy integration into triboelectric nanogenerators (TENGs) is an intense area of research to explore their potential and achieve high output performance. The current article presents the use of metal–organic framework-303 (MOF-303) as a positive triboelectric material in developing TENGs and explores applications in road safety. MOF-303 films were directly grown on an aluminum sheet through a simple hydrothermal synthesis method, enabling easy integration into the TENG device. The positive triboelectric nature of MOF-303 is verified with standard tests. The resulting TENG, incorporating MOF-303 as the positive and fluorinated ethylene propylene (FEP) as the negative triboelectric films, delivers an open-circuit voltage of approximately 435 V, a short-circuit current of 85 μA, and a power density of 7.4 W/m2. Furthermore, the continuous operation of the digital watch and calculator is demonstrated with the help of an energy management circuit. The present research paves the way for exploring the possibilities of the direct synthesis of MOF films on conducting substrates and exploring their actual triboelectric potential. The proposed use of these self-powered indicators represents a significant advancement toward enhancing future road safety systems. The simplicity of the fabrication process, combined with the significant output of the device, suggests excellent potential for its use in self-powered applications.
危险品化学品经营许可证（带存储）