Abstract In the present study, the surface of α-alumina nanoparticles was modified with CuO and Fe2O3 through a surface deposition route. Different aqueous nanofluids of pure α-alumina (Al) and α-alumina@CuO-Fe2O3 (CuFeAl) nanoparticles, each with three weight percent of 0.1, 0.2 and 0.3, were prepared with various amounts of sodium dodecyl sulfate (SDS). An adequate amount of SDS was determined by measuring the electrical conductivity (EC) of the synthesized samples and DI water to cap the charged surface of the nanoparticles. Through investigating heat transfer performance and viscosity measurements for the synthesized nanofluids, significant heat transfer improvement was observed for the ones with sufficient SDS. The CuFeAl 0.3-water nanofluid with a sufficient SDS content showed 21.4 % heat transfer enhancement. In addition, such nanofluid resulted in the EC value as low as DI water (6 µS/cm) through neutralizing the EC increment, which potentially can be applied in PEM fuel cell cooling systems.

中文翻译：

---

新型 α-氧化铝@CuO-Fe2O3 纳米流体在 PEM 燃料电池冷却系统中的潜在应用：中和电导率的增加

摘要 在本研究中，α-氧化铝纳米粒子的表面通过表面沉积途径用 CuO 和 Fe2O3 进行改性。用不同量的十二烷基硫酸钠 (SDS) 制备了纯 α-氧化铝 (Al) 和 α-氧化铝@CuO-Fe2O3 (CuFeAl) 纳米粒子的不同水性纳米流体，每种纳米流体的重量百分比分别为 0.1、0.2 和 0.3，重量百分比分别为 0.1、0.2 和 0.3。通过测量合成样品和去离子水的电导率 (EC) 来确定足够量的 SDS，以覆盖纳米粒子的带电表面。通过研究合成纳米流体的传热性能和粘度测量，观察到具有足够 SDS 的纳米流体显着的传热改进。具有足够 SDS 含量的 CuFeAl 0.3-水纳米流体表现出 21.4% 的传热增强。此外，