Abstract Molten salts have limited thermo-physical properties (such as specific heat capacity) which discourage their wide applications. Therefore, nanoparticles are dispersed in molten salt to improve the storage energy density. Thermophysical properties of CuO-nanosalt are compared with the nitrate binary solar salt. The effect of two different preparation methods of nanosalt samples have been studied and compared for the first time in one paper. Same weight concentration of nanoparticles in both methods of (1 wt.%) is conducted. The maximum increment in specific heat capacity was observed using the one step method by 21.24% in solid phase and 3.7% in liquid phase, respectively. Additionally, the sensible storage energy is improved in the case of nanosalt in comparison to nitrate salt by 9.27% in one step method. Moreover, the latent heat of 1 wt.% CuO-nanosalt (in one step method) increased by 67% in comparison to the nitrate binary salt without any additives while (in two step method) was 14.5%. This indicated the large effect of preparation methods of the nanosalt samples on different enhancements either in sensible heat or in latent heat. Samples are analysed using TEM which it showed an agglomerations of CuO nanoparticles prepared by the novel one step method.

中文翻译：

---

纳米硝酸盐熔盐的潜在和敏感储能增强

摘要 熔盐具有有限的热物理性质（如比热容），阻碍了它们的广泛应用。因此，纳米粒子分散在熔盐中以提高存储能量密度。CuO-纳米盐的热物理性质与硝酸盐二元太阳盐进行了比较。在一篇论文中首次研究和比较了两种不同制备方法对纳米盐样品的影响。在 (1 wt.%) 的两种方法中进行相同重量浓度的纳米粒子。使用一步法观察到的比热容最大增量分别为固相 21.24% 和液相 3.7%。此外，在一步法中，与硝酸盐相比，纳米盐的显存能量提高了 9.27%。而且，与不含任何添加剂的硝酸二元盐相比，1 wt.% CuO-纳米盐（一步法）的潜热增加了 67%，而（两步法）为 14.5%。这表明纳米盐样品的制备方法对显热或潜热的不同增强有很大影响。使用 TEM 分析样品，结果显示出通过新型一步法制备的 CuO 纳米颗粒的团聚。