Abstract
Plasmonic nanofluids show great interests for light-matter applications due to the tunable optical properties. By tuning the nanoparticle (NP) parameters (material, shape, and size) or base fluid, plasmonic nanofluids can either absorb or transmit the specific solar spectrum and thus making nanofluids ideal candidates for various solar applications, such as: full spectrum absorption in direct solar absorption collectors, selective absorption or transmittance in solar photovoltaic/thermal (PV/T) systems, and local heating in the solar evaporation or nanobubble generation. In this chapter, we first summarized the preparation methods of plasmonic nanofluids, including the NP preparation based on the top-down and bottom-up, and the nanofluid preparation based on one-step and two-step. And then solar absorption performance of plasmonic nanofluids based on the theoretical and experimental design were discussed to broaden the absorption spectrum of plasmonic nanofluids. At last, solar thermal applications and challenges, including the applications of direct solar absorption collectors, solar PT/V systems, solar distillation, were introduced to promote the development of plasmon nanofluids.
Highlights
Nowadays, with the development of society and the improvement of people’s living standards, environment issues, such as: greenhouse effect, acid rain, and haze, has become more serious
The excellent optical absorption performance of plasmonic NPs make it to be a great candidate in the solar thermal conversion applications, which is critical for the solar thermal conversion applications
The results showed that Au nanofluids are not feasible for solar evaporation applications due to the high cost and low absorptance
Summary
With the development of society and the improvement of people’s living standards, environment issues, such as: greenhouse effect, acid rain, and haze, has become more serious. Solar utilizations can be divided into two main categories: solar-electric and solar-thermal Both of them are needed to enhance the solar absorption performance of working media at its first step of solar conversion applications. It’s critical to improve the solar absorption performance of working mediums for the solar thermal conversion applications. Based on the surface absorber, various nanostructure coatings (e.g., grating, porous structure, and so on [5, 6]) were designed to achieve the selective absorption ability, Advances in Microfluidics and Nanofluids which serves as solar selective absorbers by heating the surface and transferring the heat to the working fluid for the follow-up applications. This chapter is expected to provide researchers with deep insight into the solar thermal conversion of plasmonic nanofluids and facilitate future studies in this field
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