In present work, semiconducting iron (III) oxide (Fe₂O₃) nanoparticles have been synthesized by sol–gel method. X-ray diffraction (XRD), UV–Visible (UV–Vis) absorption spectroscopy and transmission electron microscopy (TEM) have been used for the characterization of the synthesized nanoparticles. Two-step technique was used to formulate stable ethylene glycol (EG) based Fe₂O₃ nanofluids at room temperature. Thermal conductivity of nanofluids has been measured using hot disc thermal constants analyzer. Significant enhancement in the thermal conductivity is noted at very low nanoparticle loading (up to 1 wt%). Ultrasonic velocity and ultrasonic attenuation in the prepared nanofluids were investigated using an ultrasonic interferometer and acoustic particle sizer (APS-100), respectively. APS-100 was also used for the analysis of particle size distribution (PSD) of Fe₂O₃ nanoparticles in the prepared nanofluids. The PSD result of APS-100 has been found in good agreement with that of TEM. The characteristics behaviour of Fe₂O₃ nanofluid has been illustrated based on its ultrasonic and thermal properties. Our investigations advocate that Fe₂O₃ nanofluids have potential application for effective heat transfer management in various cooling industries.

在目前的工作中，已经通过溶胶-凝胶法合成了三氧化二铁（Fe ₂ O ₃）半导体纳米颗粒。X射线衍射（XRD），紫外可见（UV-Vis）吸收光谱和透射电子显微镜（TEM）已用于表征合成的纳米粒子。采用两步法配制稳定的基于乙二醇（EG）的Fe ₂ O ₃在室温下为纳米流体。纳米流体的热导率已使用热盘热常数分析仪进行了测量。在非常低的纳米颗粒负载下（高达1 wt％），导热系数显着提高。分别使用超声干涉仪和声学粒度仪（APS-100）对制备的纳米流体中的超声速度和超声衰减进行了研究。APS-100还用于分析制备的纳米流体中Fe ₂ O ₃纳米颗粒的粒度分布（PSD）。已发现APS-100的PSD结果与TEM吻合良好。Fe ₂ O ₃的特征行为纳米流体已经根据其超声和热学性质进行了说明。我们的研究主张，Fe ₂ O ₃纳米流体在各种冷却行业中对有效的传热管理具有潜在的应用。