A photothermal evaporation surface and its preparation and application

Abstract

The invention discloses a photothermal evaporation surface, and a preparation method and an application thereof, and belongs to the technical field of solar photothermal utilization. The photothermalevaporation surface is formed by attaching porous microstructures, which are periodically arranged in an array, to the surface of a substrate, and every porous microstructure is a coffee ring-shaped structure formed by the accumulation of nanoparticles; and a micro-droplet generator is used to periodically arrange nanofluid droplets on the surface of the substrate in the array manner, and heatingis carried out to evaporate the droplets until dryness in order to form the coffee ring-shaped porous microstructures, periodically arranged in the array manner, on the surface of the substrate. The photothermal evaporation surface provided by the invention has a high photothermal conversion efficiency and can be repeatedly used, and the preparation method has the advantages of very small use amount of the nanofluid required for preparing the high-efficiency photothermal evaporation surface, low cost, and facilitation of industrial application.

Description

Technical field [0001] The invention belongs to the technical field of solar photothermal utilization, and particularly relates to a photothermal evaporation surface and its preparation and application. Background technique [0002] The evaporation process can be seen everywhere in daily life, and is widely used in ship power, power generation, seawater desalination, chemical production and other fields. At present, the existing technologies for absorbing solar energy to produce steam mainly include nanofluid integral absorption, high-efficiency solar thermal conversion film surface absorption, and spectral selective absorption film. However, in these absorption methods, the overall absorption of nanofluids has the disadvantages of high consumption of nanoparticles and high cost, and is not suitable for large-scale industrial applications; the high-efficiency solar thermal conversion film uses porous materials as the skeleton, and the photothermal conversion of the nanoparticles ...

AI Technical Summary

Problems solved by technology

However, in these absorption methods, the overall absorption of nanofluids has the disadvantages of consuming too many nanoparticles and high cost, and is not suitable for large-scale industrial applications; the high-efficiency solar photothermal conversion film uses a porous material as the skeleton, and the photothermal conversion nanoparticles are attached On the surface of porous materials, there are problems of unstable performance and more dependence on the coordination between porous materials and nanoparticles; spectrally selective absorption film is the most widely used material, but it can only be coated on the outer surface of the material, relying on the heat conduction of the material to heat Liquid, high heat loss, low efficiency

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