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Synthesis of Therminol-based plasmonic nanofluids with core/shell nanoparticles and characterization of their absorption/scattering coefficients
Solar Energy Materials and Solar Cells ( IF 6.3 ) Pub Date : 2020-06-01 , DOI: 10.1016/j.solmat.2020.110442
Ryeri Lee , Joong Bae Kim , Caiyan Qin , Heon Lee , Bong Jae Lee , Gun Young Jung

Abstract Direct-absorption solar collectors (DASCs) that employ plasmonic nanofluids with engineered optical properties have drawn much attention for solar thermal applications. One of the major issues limiting further development of DASCs is the long-term dispersion of nanoparticles within the plasmonic nanofluids, which should be sustainable at high-temperature conditions. In this research, we propose surface-modified metal@SiO2 core/shell nanoparticles (CSNPs) to improve the dispersion stability and tune the absorption coefficient of nanofluids. The Au@SiO2 and Ag@SiO2 CSNPs are synthesized using a low-temperature two-step solution process. The plasmonic nanofluids with the synthesized metal@SiO2 CSNPs exhibit excellent dispersion stability of 93.7% for Au@SiO2 and 100% for Ag@SiO2 in 6 months without using any surfactants, and they also present a good thermal stability after thermal exposure at 150 ∘C for an hour. The absorption and scattering coefficients of a plasmonic nanofluid should be known precisely to properly analyze its photothermal conversion. Here, we also develop a new measurement system to separately determine the absorption and scattering coefficients of nanofluid. The Au@SiO2 CSNPs-dispersed nanofluid is observed to exhibit an extremely low scattering albedo (i.e., ω = 0.011 ) in comparison with that of the Ag@SiO2 CSNPs-dispersed nanofluid ( ω = 0.3 ).

中文翻译:

具有核/壳纳米粒子的 Therminol 基等离子体纳米流体的合成及其吸收/散射系数的表征

摘要 采用具有工程光学特性的等离子体纳米流体的直接吸收太阳能收集器 (DASC) 已引起太阳能热应用的广泛关注。限制 DASC 进一步发展的主要问题之一是纳米粒子在等离子体纳米流体中的长期分散,这在高温条件下应该是可持续的。在这项研究中,我们提出了表面改性的金属@SiO2 核/壳纳米粒子 (CSNPs) 来提高分散稳定性并调整纳米流体的吸收系数。Au@SiO2 和 Ag@SiO2 CSNPs 是使用低温两步溶液法合成的。具有合成金属@SiO2 CSNPs 的等离子体纳米流体在不使用任何表面活性剂的情况下,在 6 个月内表现出优异的分散稳定性,Au@SiO2 为 93.7%,Ag@SiO2 为 100%,在 150 ∘C 下热暴露 1 小时后,它们还表现出良好的热稳定性。应准确了解等离子体纳米流体的吸收和散射系数,以正确分析其光热转换。在这里,我们还开发了一种新的测量系统来分别确定纳米流体的吸收和散射系数。与 Ag@SiO2 CSNPs 分散的纳米流体(ω = 0.3)相比,Au@SiO2 CSNPs 分散的纳米流体表现出极低的散射反照率(即,ω = 0.011)。我们还开发了一种新的测量系统来分别确定纳米流体的吸收和散射系数。与 Ag@SiO2 CSNPs 分散的纳米流体(ω = 0.3)相比,Au@SiO2 CSNPs 分散的纳米流体表现出极低的散射反照率(即,ω = 0.011)。我们还开发了一种新的测量系统来分别确定纳米流体的吸收和散射系数。与 Ag@SiO2 CSNPs 分散的纳米流体(ω = 0.3)相比,Au@SiO2 CSNPs 分散的纳米流体表现出极低的散射反照率(即,ω = 0.011)。
更新日期:2020-06-01
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