Abstract
A multifunctional silicon carbide (6H–SiC) material with efficient wicking and evaporative cooling performances in a temperature range of 23–180 °C is created through hierarchical surface nano/microstructuring by a femtosecond laser. The elaborated hierarchical surface structure is an array of nanotextured microgrooves that includes structural features in a range between about 15 nm and 140 μm, integrating benefits from micro- and nanoscale physics of capillarity and thermodynamics. The spatiotemporal dynamics of both water spreading and temperature field obtained by optical and infrared imaging show the excellent wicking and evaporative cooling functionalities of the created material. The range of applications of the developed multifunctional 6H–SiC material includes the technologies for enhancing power generation efficiency, waste heat recovery, and cooling high-heat-flux Si- and SiC-based electronic devices. The application of the created material in cooling technologies for power generation can result in substantial fuel savings and global reduction in greenhouse gas emissions.
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