The search for excellent heat transfer fluids necessitates the development of novel nanofluids. The paper is the first report revealing the potential of sodium carbide (Na 2 C 2 ) nanoparticle for heat transfer and thermal shielding applications. For this, Na 2 C 2 is prepared from the porous carbon matrix of Aloe vera leaves by hydrothermal method. The morphological changes on hydrothermal treatment and the thermal stability are analyzed by Field Emission Scanning Electron Microscopy and Thermogravimetry. The X-ray diffraction analysis reveals the formation of sodium carbide, which is confirmed by Fourier transform infrared, Ultraviolet–Visible–Near Infrared, and Raman spectroscopic analyses. The spectroscopic study of the sample synthesized shows indirect bandgap energy of 1.58 eV. The thermal diffusivity of Na 2 C 2 nanofluid, determined by the single-beam thermal lens technique, exhibited 87 % enhancement for the base fluid, suggesting its potential in heat transfer applications.

中文翻译：

---

用于传热应用的有机金属碳化钠：热透镜研究

寻找优良的传热流体需要开发新型纳米流体。该论文是第一份揭示碳化钠 (Na 2 C 2 ) 纳米颗粒在传热和热屏蔽应用中的潜力的报告。为此，Na 2 C 2 是通过水热法从芦荟叶的多孔碳基质中制备的。用场发射扫描电子显微镜和热重法分析了水热处理的形态变化和热稳定性。X 射线衍射分析揭示了碳化钠的形成，这通过傅里叶变换红外、紫外-可见-近红外和拉曼光谱分析得到证实。合成样品的光谱研究显示间接带隙能量为 1.58 eV。Na 2 C 2 纳米流体的热扩散系数，