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WSe2 Nanosheets Synthesized by a Solvothermal Process as Advanced Nanofluids for Thermal Solar Energy
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-13 , DOI: 10.1021/acssuschemeng.9b06489 Paloma Martínez-Merino 1 , Elisa Sani 2 , Luca Mercatelli 2 , Rodrigo Alcántara 1 , Javier Navas 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-01-13 , DOI: 10.1021/acssuschemeng.9b06489 Paloma Martínez-Merino 1 , Elisa Sani 2 , Luca Mercatelli 2 , Rodrigo Alcántara 1 , Javier Navas 1
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Nanofluids are colloidal systems based on the suspension of nanoparticles in a fluid. Their thermal properties mean that they are promising heat transfer fluids with possible applications in different fields, concentrating solar energy being one of particular interest. Thus, this study presents the preparation of nanofluids based on WSe2 nanoparticles suspended in the eutectic mixture of biphenyl and diphenyl oxide, which is a heat transfer fluid widely used in concentrating solar power plants. To this end, solvothermal synthesis was used to prepare WSe2 nanosheets, which were characterized by means of scanning transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and Raman spectroscopy. The physical and chemical stability of the nanofluids was analyzed, observing that they became more stable when Triton X-100 was used as the surfactant. The presence of WSe2 nanosheets did not result in a significant increase in density or viscosity, but, by contrast, improvements were obtained in their isobaric specific heat and thermal conductivity, up to 4.7 and 64%, respectively. Spectral optical properties were investigated as well, showing a significant effect of the WSe2 nanosheet addition to the extinction coefficient of the base fluid in the wavelength range of the solar spectrum, promising for direct absorption solar collectors. Finally, the efficiency of the nanofluids was analyzed in a solar collector considering the Ur parameter, obtaining a remarkable increase in the efficiency of up to 34% with respect to the pure heat transfer fluid. This proves the possibility to obtain a sustainable production of energy from the sun using these WSe2-based nanofluids.
中文翻译：
通过溶剂热法合成的WSe 2纳米片作为用于热太阳能的先进纳米流体
纳米流体是基于纳米颗粒在流体中的悬浮液的胶体系统。它们的热性能意味着它们是有前途的传热流体，并有望在不同领域中得到应用，尤其是集中太阳能。因此，本研究提出了基于悬浮在联苯和二苯醚的共晶混合物中的WSe 2纳米颗粒的纳米流体的制备，联苯和二苯醚是一种广泛用于聚光太阳能发电厂的传热流体。为此，溶剂热合成用于制备WSe 2纳米片，其通过扫描透射电子显微镜，X射线衍射，X射线光电子能谱和拉曼光谱来表征。分析了纳米流体的物理和化学稳定性，观察到当使用Triton X-100作为表面活性剂时，纳米流体变得更加稳定。WSe 2纳米片的存在并未导致密度或粘度的显着增加，但是相比之下，它们的等压比热和导热率分别提高了4.7％和64％。还研究了光谱光学性质，显示了WSe 2的显着效果纳米片除了在太阳光谱的波长范围内基本流体的消光系数外，还有望用于直接吸收式太阳能收集器。最后，将纳米流体的效率的太阳能集热器考虑到分析ü ř参数，获得在高达34％，相对于纯的传热流体的效率显着增加。这证明了使用这些基于WSe 2的纳米流体从太阳获得可持续能源生产的可能性。
更新日期：2020-01-14
中文翻译：
通过溶剂热法合成的WSe 2纳米片作为用于热太阳能的先进纳米流体
纳米流体是基于纳米颗粒在流体中的悬浮液的胶体系统。它们的热性能意味着它们是有前途的传热流体，并有望在不同领域中得到应用，尤其是集中太阳能。因此，本研究提出了基于悬浮在联苯和二苯醚的共晶混合物中的WSe 2纳米颗粒的纳米流体的制备，联苯和二苯醚是一种广泛用于聚光太阳能发电厂的传热流体。为此，溶剂热合成用于制备WSe 2纳米片，其通过扫描透射电子显微镜，X射线衍射，X射线光电子能谱和拉曼光谱来表征。分析了纳米流体的物理和化学稳定性，观察到当使用Triton X-100作为表面活性剂时，纳米流体变得更加稳定。WSe 2纳米片的存在并未导致密度或粘度的显着增加，但是相比之下，它们的等压比热和导热率分别提高了4.7％和64％。还研究了光谱光学性质，显示了WSe 2的显着效果纳米片除了在太阳光谱的波长范围内基本流体的消光系数外，还有望用于直接吸收式太阳能收集器。最后，将纳米流体的效率的太阳能集热器考虑到分析ü ř参数，获得在高达34％，相对于纯的传热流体的效率显着增加。这证明了使用这些基于WSe 2的纳米流体从太阳获得可持续能源生产的可能性。
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