| After entering the 21 st century,the energy and environmental problems faced by human society,such as energy shortages and climate change,are becoming more and more prominent.It is urgent to find a type of clean energy to gradually replace fossil energy used on a large scale.Photo-thermal conversion,as one of the most effect ways to convert and utilize solar energy,attracts lots of attention and studies recently.Most of the previous researches,however,mainly focused on non-patterned solar absorbers by improving the structural and chemical characteristics of the solar absorbers used in the interfacial evaporation systems.In this work we investigated the influence of patterned surface on the evaporation performance of solar absorber.The patterned surfaces studied,which include black patterns and white patterns,were achieved by selectively printing carbon black on the air-laid paper.Such design leads to the lateral temperature differences between adjacent patterns of the solar absorber under solar illumination.The temperature differences result in the lateral heat and mass transfer between those areas,which can effectively accelerate solar driven vapor generation.Additionally,we found the evaporation performance can be optimized through the design of surface patterns,which demonstrates the potential in reducing the usage of the light-absorbing material in the solar absorber.The findings in this work not only expand the understanding of the interfacial evaporation systems,but also offer additional guidelines in designing interfacial evaporation systems.Moreover,it is also possible to apply this work in the field of the crystal growth direction.For example,the macroscopic black and white of the sample surface can be used to form different temperatures on the surface by photo-thermal conversion,thereby forming a complex dynamic thermal field and studying its influence on the crystal form and morphology of the crystal.This provides a new way to regulate crystal growth. |
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