Zhu Chuang, He Wenxuan, Gu Manting, Zhang Dan, Tian Baiyuan
School of Energy and Electrical Engineering, Qinghai University, Xining 810016, China.
Engineer School, Qinghai Institute of Technology, Xining 810016, China.
Nanomaterials (Basel). 2025 Jul 14;15(14):1094. doi: 10.3390/nano15141094.
LiNO-NaNO-KNO-NaNO has a relatively low phase-change temperature, making it suitable for low-temperature heat utilization systems. This study focuses on the performance optimization of the quaternary molten salt to advance its applicability. A series of nanocomposites consisting of nano-SiO/MgO and the quaternary salt are prepared. Core thermophysical properties, including phase transition behaviors and thermal transport parameters, are quantified. The incorporation of nano-SiO/MgO induces moderate adjustments to the melting point and latent heat yet demonstrates an obvious enhancement in specific heat capacity. Optimal doping at 0.7 wt.% SiO and 0.3 wt.% MgO yields a molten-state specific heat of 1.51 J/(g·K), representing a 6% increase over the undoped base salt (1.42 J/(g·K)). By combining the thermal diffusivity properties of the samples, this study found that the doping of nanoparticles typically induces new structures in molten salts that tend to enhance the specific heat capacity while simultaneously reducing thermal diffusivity.
LiNO-NaNO-KNO-NaNO具有相对较低的相变温度，使其适用于低温热利用系统。本研究聚焦于四元熔盐的性能优化以推进其适用性。制备了一系列由纳米SiO/MgO和四元盐组成的纳米复合材料。对包括相变行为和热传输参数在内的核心热物理性质进行了量化。纳米SiO/MgO的加入对熔点和潜热产生了适度调整，但比热容有明显增强。在0.7 wt.% SiO和0.3 wt.% MgO下的最佳掺杂产生了1.51 J/(g·K)的熔融态比热容，相较于未掺杂的基础盐（1.42 J/(g·K)）增加了6%。通过结合样品的热扩散率性质，本研究发现纳米颗粒的掺杂通常会在熔盐中诱导新结构，这些新结构往往会增强比热容，同时降低热扩散率。
