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首页> 外文期刊>Journal of Energy Storage >SiO_2@Al_2O_3 core-shell nanoparticles based molten salts nanofluids for thermal energy storage applications
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SiO_2@Al_2O_3 core-shell nanoparticles based molten salts nanofluids for thermal energy storage applications

机译：基于SiO_2 @ Al_2O_3核壳纳米粒子的熔盐纳米流体在热能存储中的应用

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Three different sizes of the SiO2@Al2O3 core-shell nanoparticles were synthesized by tuning the silica precursor using the wet chemical route. The precise control of the outer shell diameter of SiO2 was controlled by optimum concertation of the silica precursor in the alumina solution. Gradual increment of the outer shell depth and the chain-like aggregated structure was observed from TEM while increasing the silica precursor during the synthesis of SiO2@Al2O3 core-shell nanoparticle. Respectively, the size of the SiO2@Al2O3-10 nanoparticles is 12 +/- 2 nm with no observable SiO2 diameter, SiO2@Al2O3-20 is 14 +/- 2 nm with 2 nm of SiO2 diameter and SiO2@Al2O3-35 is 17 +/- 2 nm with 5 nm of SiO2 diameter in the outer layer. The interaction and quantitative elemental properties of the core-shell nanoparticles were studied using FTIR, XRD and SEM-EDX analyses. Consequently, the potentiality of the core-shell nanoparticle was analyzed for the prospective of TES application by mixing 1 wt% core-shell nanoparticles with 99 wt% eutectic binary molten nitrate salt (nanofluids) via one-step dry preparation method. The changes in the thermophysical properties were observed with respect to the addition of silica precursor or increasing silica outer diameter in the SiO2@Al2O3 core-shell nanoparticle. From the analysis, 19% higher thermal conductivity was obtained for the nanofluid prepared with SiO2@Al2O3-35 core-shell nanoparticles. A higher viscosity also was observed for the chain-like aggregates of SiO2@Al2O3-35 core shell-based nanofluids, which was 25 to 34% higher compared to the base fluids in the temperature range between 250-400 degrees C.
机译：通过使用湿化学路线调节二氧化硅前体，合成了三种不同尺寸的SiO2 @ Al2O3核壳纳米粒子。 SiO 2外壳直径的精确控制通过氧化铝溶液中二氧化硅前体的最佳协调来控制。从TEM中观察到外壳深度和链状聚集结构逐渐增加，同时在合成SiO2 @ Al2O3核-壳纳米粒子的过程中增加了二氧化硅前体。 SiO2 @ Al2O3-10纳米粒子的尺寸分别为12 +/- 2 nm，没有可观察到的SiO2直径，SiO2 @ Al2O3-20为14 +/- 2 nm，其中SiO2直径为2 nm，SiO2 @ Al2O3-35为在外层中的SiO2直径为5 nm时为17 +/- 2 nm。使用FTIR，XRD和SEM-EDX分析研究了核-壳纳米粒子的相互作用和定量元素性质。因此，通过一步干燥制备方法，通过将1 wt％的核壳纳米颗粒与99 wt％的低共熔二元硝酸盐盐（纳米流体）混合，分析了核壳纳米颗粒对TES应用的前景。相对于在SiO 2 Al 2 O 3核-壳纳米颗粒中添加二氧化硅前体或增加二氧化硅外径，观察到热物理性质的变化。通过分析，使用SiO2 @ Al2O3-35核-壳纳米颗粒制备的纳米流体的导热率提高了19％。 SiO2 @ Al2O3-35核壳基纳米流体的链状聚集体也观察到更高的粘度，在250-400摄氏度之间的温度范围内，其粘度比基础流体高25％至34％。

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