An efficient solar water evaporator is an important strategy for addressing the problem of water shortage. Constructing high-performance solar interfacial evaporators through bionic design has become a crucial approach for performance enhancement. Through the study of zebra patterns, it has been found that the black-and-white alternating patterns generate vortices on the surface of the zebra’s skin, thereby reducing the temperature. By utilizing the vortices brought about by the temperature difference, the design of a solar water evaporator is created based on the bionic zebra pattern, so as to improve its water evaporation performance. In this work, green and sustainable wood is used as the base of the evaporator, and the bionic design of zebra stripes is adopted. Meanwhile, the following research is conducted: The wood is cut into thin slices with dimensions of 30 × 30 × 5 mm3, and a delignification treatment is performed. Tannic acid-Fe ions are used as the photothermal material for functionalization. A series of stable patterned water evaporators based on delignification wood loaded with tannic acid-Fe ion complex (TA-Fe3+) are successfully prepared. Among them, the wood-based solar water evaporator with 3 mm zebra stripes exhibits excellent photothermal water evaporation performance, achieving a water evaporation rate of 1.44 kg·m−2·h−1under the illumination intensity of one sun. Its water evaporation performance is significantly superior to that of other coating patterns, proving that the bionic design of zebra patterns is effective and can improve water evaporation efficiency. This work provides new insights into the development of safe and environmentally friendly solar interfacial water evaporation materials through bionic design.
Bin Hui,Yingying Li,Qiongtao Huang,Guoliang Li,Jian Li,Liping Cai,Haipeng Yu
A smart coating based on wood substrate with photochromic behavior and hydrophobic performance was successfully fabricated by depositing modified organic photochromic material (PM) on wood surface using a simple drop-coating method. The prepared samples were characterized by the scanning electron microscopy (SEM) and attenuated total reflectance–Fourier transformation infrared (ATR–FTIR) techniques. The colorimetric parameters L *, a *, b *, and Δ E * of the samples under ultraviolet (UV) irradiation and visible (VIS) irradiation were measured, respectively. The response time of samples was calculated and the water contact angles (CAs) were also measured. The ATR–FTIR spectra and the SEM analysis demonstrate that PM modified by polyvinyl alcohol and the dextrin deposited on the wood surface, and the resulted coating was firmly adhered to wood by adhesion test results. With the PM concentrations increasing from 0 to 3.0%, the Δ E * values of samples remarkably increased from 3.7 to 58.2. Furthermore, the coloration time and fading time in the cross section were longer than the radial and tangential sections . Through the octadecyltrichlorosilane (OTS) treatment, the sample surface exhibited hydrophobic property with a contact angle of 134°, broadening the applications of the photoresponsive coatings in a harsh environment such as prolonged exposure under UV light or rain.
危险品化学品经营许可证（带存储）