Nowadays, food safety is still facing great challenges. During storage and transportation, perishable goods have to be kept at a low temperature. However, the current logistics still lack enough preservation ability to maintain a low temperature in the whole. Hence, considering the temperature fluctuation in logistics, in this work, the passive radiative cooling (RC) technology was applied to package to enhance the temperature control capability in food storage and transportation. The RC emitter with selective infrared emission property was fabricated by a facile coating method, and Al2O3 was added to improve the wear resistance. The sunlight reflectance and infrared emittance within atmospheric conditions could reach up to 0.92 and 0.84, respectively. After abrasion, the sunlight reflection only decreased by 0.01, and the infrared emission showed a negligible change, revealing excellent wear resistance. During outdoor measurement, the box assembled by RC emitters (RC box) was proved to achieve temperature drops of ∼9 and ∼4 °C compared with the corrugated box and foam box, respectively. Besides, the fruits stored in the RC box exhibited a lower decay rate. Additionally, after printing with patterns to meet the aesthetic requirements, the RC emitter could also maintain the cooling ability. Given the superior optical properties, wear resistance, and cooling capability, the emitter has great potential for obtaining a better temperature control ability in food storage and transportation.
The poor adhesion strength between epoxy resin (EP) and carbon fiber (CF) is the bottleneck that greatly restricts the mechanical performances of carbon fiber reinforced polymers (CFRP) composite coatings. Preparing micro/nano particles on the surface of CF is an attractive strategy to boost the interfacial adhesion strength between CF and EP. However, the uneven and sparse distribution of micro/nano particles on the CFs surface negatively limited the interfacial compatibility between EP and CF, and alleviated the mechanical performances of CFRP composite materials. Therefore, in this work, we constructed a layer of ZnO seed on the surface of CFs via a hydrothermal method firstly, followed by the in-situ growth of ZnO nanolayers with needle-like structures, and further chemically grafting with active amino functional groups to boost the interfacial compatibility between CF and EP. Compared to the oxidized carbon fiber/EP composite coating (CFO@EP) and the in-situ growth of ZnO micro/nano structured carbon fiber composite coating (ZnO/CF@EP), the wear rate of AS-ZnO/CF@EP coating was significantly reduced by 53.28 % and 39.44 %, and the erosion mass were reduced by 19.38 % and 14.75 %, respectively. We revealed the mechanisms behind the interfacial reinforcement and improved erosion-wear resistance of the AS-ZnO/CF@EP composite coating, which was attributed to the mechanical interlocking brought by the uniformly dense ZnO nanolayers with needle-like structures and the chemical bonding brought by amination treatment in AS-ZnO/CF. This research work indicates that the synergistic effect of rough structure meshing and chemical bonding is crucial for enhancing the interfacial adhesion strength and erosion resistance of carbon enforced polymer composite coatings when being applied in the harsh marine environment.
危险品化学品经营许可证（带存储）