Imran Mohd, Shaik Aabid Hussain, Ansari Akhalakur Rahman, Aziz Abdul, Hussain Shahir, Fadil Abouatiaa Ahmed Farag, Khan Afzal, Chandan Mohammed Rehaan
Chemical Engineering Department, Faculty of Engineering, Jazan University P. O. Box. 706 Jazan 45142 Saudi Arabia.
Chemical Engineering Department, School of Civil and Chemical Engineering, Vellore Institute of Technology Vellore TN 632014 India
RSC Adv. 2018 Apr 16;8(25):13970-13975. doi: 10.1039/c7ra13467c. eCollection 2018 Apr 11.
This article aims at the synthesis of highly stable γ-FeO magnetic nanoparticles and their ferrofluids using different base liquids such as liquid paraffin, motor oil and sunflower oil for heat transfer applications. Phase and morphology of the synthesized nanoparticles were probed using XRD, SEM and FTIR spectroscopy. The average nanoparticle size of γ-FeO magnetic nanoparticles was found to be 13 nm. Stability of the ferrofluids was monitored by visually observing the aggregation nature of the nanoparticles for 180 days. The ferrofluid prepared using motor oil as a base fluid exhibited high stability (for more than 1 year) and a mean enhancement of 77% in thermal conductivity at 1.5 vol% nanoparticles was observed as compared to base fluid. The viscosity of the ferrofluids was also measured and found to be 18, 38 and 8 cP at 27 °C for the liquid paraffin based, motor oil based and sunflower oil based ferrofluid, respectively.
本文旨在合成高度稳定的γ-FeO磁性纳米颗粒及其铁磁流体，使用不同的基础液体，如液体石蜡、机油和葵花籽油，用于传热应用。使用X射线衍射（XRD）、扫描电子显微镜（SEM）和傅里叶变换红外光谱（FTIR）对合成的纳米颗粒的相和形态进行了探测。发现γ-FeO磁性纳米颗粒的平均粒径为13纳米。通过直观观察纳米颗粒180天的聚集性质来监测铁磁流体的稳定性。以机油为基础液体制备的铁磁流体表现出高稳定性（超过1年），与基础液相比，在纳米颗粒体积分数为1.5%时，热导率平均提高了77%。还测量了铁磁流体的粘度，发现在27℃时，基于液体石蜡、机油和葵花籽油的铁磁流体的粘度分别为18、38和8厘泊。
