Optical properties of carboxyl functionalized carbon nanotube aqueous nanofluids as direct solar thermal energy absorbers
Optical properties of carboxyl functionalized carbon nanotube aqueous nanofluids as direct solar thermal energy absorbers
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DOI：
10.1016/j.solener.2015.07.012
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发表时间：
2015-09
期刊：
影响因子：
6.7
通讯作者：
T. B. Gorji;A. Ranjbar;S. Mirzababaei
中科院分区：
文献类型：
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作者：
T. B. Gorji;A. Ranjbar;S. Mirzababaei
纳米颗粒在液体中的悬浮液显示出其基础介质的热物理和光学性质的显着变化。在这项研究中，碳纳米管被化学官能化，以克服其固有的疏水性，使其分散在极性液体，如水。在去离子水中的原始和官能化的碳纳米管纳米流体的分散体的制备和它们的光学性质在室温和高温下进行了测量。使用吸收光谱的定量分析表明，碳纳米管分散体相对于纯水具有较高的辐射吸收，而纯水的辐射吸收随着温度的升高而降低。光学表征表明，与原始碳纳米管纳米流体相比，官能化碳纳米管纳米流体在经历热循环后和长时间（长达三个月）后表现出显着的稳定性。
Nanoparticle suspensions in liquids have shown remarkable changes in thermo-physical and optical properties of their base media. In this study, carbon nanotubes are chemically functionalized in order to overcome their inherent hydrophobic nature and make them dispersible in a polar liquid such as water. Dispersions of pristine and functionalized carbon nanotube nanofluids in deionized water were prepared and their optical properties at room and elevated temperatures were measured. Quantitative analysis using absorption spectroscopy demonstrates higher radiation absorption of carbon nanotube dispersions with respect to pure water which is decreased by increasing temperature. Optical characterization shows that functionalized carbon nanotube nanofluids show remarkable stability after undergoing thermal cycling and after extended periods of time (up to three months) in comparison to pristine carbon nanotube nanofluids.