Magnetic field induced the assembling of Photothermal evaporator for efficient solar‐driven desalination

• Published in: EcoMat (Beijing, China) Vol. 5; no. 9
• Main Authors: Zhou, Mingyu, Han, Peng, Qi, Guicun, Gao, Dali, Abdel‐Ghafar, Hamdy Maamoun, Wang, Yuchao, Tao, Shengyang
• Format: Journal Article
• Language: English
• Published: Beijing John Wiley & Sons, Inc 01.09.2023; Wiley
• Subjects: adjustable surface structure; Arrays; Carbon; carbon‐coated magnetic nanoparticles; Desalination; Electromagnetic absorption; Evaporation; Evaporators; Glucose; Light; magnetic field induced; Magnetic fields; Magnetic induction; Morphology; Nanoparticles; Oxidation; photothermal evaporation; Structural design; Structural engineering; Surface structure
• ISSN: 2567-3173; 2567-3173
• DOI: 10.1002/eom2.12390

Abstract Solar‐driven interfacial evaporation is a sustainable and economical technology for freshwater generation. Structural design of photothermal material is an effective strategy to improve the evaporation performance but is usually bothered by complicated processes and non‐adjustability. Herein, magnetic nanoparticles assembled photothermal evaporator was developed, which showed an adjustable spinal array surface under uniform magnetic field induction. By regulating position in the magnetic field, the desirable surface structures could be uniform at relatively low load density of magnetic nanoparticles to improve light absorption via multiple reflections. Magnetic field induced evaporator could accelerate evaporation to over 1.39 kg m −2  h −1 under 1‐sun illumination, which was 2.8 times that of natural evaporation. After coated by carbon layer, magnetic nanoparticles could overcome the oxidation to realize stable evaporation in long‐term desalination. The facile strategy to optimize the surface structure via magnetic field is appropriate for various fields with special requirements on surface structure. image