Iron oxide nanoparticles (IONPs) exhibit low toxicity and high chemical stability, attractive for developing of nanofluids (NFs) for advanced medical applications. This research focuses on the study of the optical, mechanical, and electrical dynamics of iron oxide–ethanol NFs. A novel sensitive methodology for analyzing the influence of nanoparticles (NPs) over the optical and electrical processes exhibited by IONFs is reported. The IONPs were synthesized by a microemulsion route and were characterized by transmission electron microscopy, scanning electron microscopy, and X-ray diffraction. The NPs exhibit a mean diameter of 30 nm and they were identified as FeO. UV–Vis spectroscopy allows us determining the volume fraction of the fluid as a function of time. The assistance of a Michelson interferometer integrated with an image processing methodology was employed to explore the dynamics of the nanostructures. The percentage of NPs involved in linear and nonlinear dynamic fluid processes was estimated by taking a double-stage (spatial and frequency domains) Fast Fourier Transform in the interferometric pattern. A DC voltage source was used to study the electrical conductivity of the NF as it was being sedimented. The opto-mechatronic parameters were correlated, considering the volume fraction as the main variable to determine the optical and electrical characteristics. For the FeO NF, it is identified that the linear effects of sedimentation present a stronger impact on the optical properties, while the nonlinear interactions have more influence on the electrical conductivity. The main findings of this research have potential applications in rheological instrumentation to analyze complex effects using transient opto-mechatronic components.

中文翻译：

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使用空间和频域分析的氧化铁基纳米流体的光机电动态特性


氧化铁纳米粒子（IONP）具有低毒性和高化学稳定性，对于开发用于先进医疗应用的纳米流体（NF）具有吸引力。本研究重点研究氧化铁-乙醇纳米纤维的光学、机械和电动力学。报道了一种新颖的灵敏方法，用于分析纳米颗粒 (NP) 对 IONF 所表现出的光学和电学过程的影响。 IONPs通过微乳液途径合成，并通过透射电子显微镜、扫描电子显微镜和X射线衍射进行表征。纳米颗粒的平均直径为 30 nm，被鉴定为 Fe3O。紫外-可见光谱使我们能够确定流体的体积分数随时间的变化。迈克尔逊干涉仪与图像处理方法相结合的帮助被用来探索纳米结构的动力学。通过在干涉图案中采用双级（空间和频域）快速傅立叶变换来估计参与线性和非线性动态流体过程的纳米粒子的百分比。使用直流电压源来研究 NF 沉积时的电导率。将光机电参数相关联，将体积分数作为确定光学和电学特性的主要变量。对于FeO NF，发现沉降的线性效应对光学性质的影响更大，而非线性相互作用对电导率的影响更大。这项研究的主要发现在流变仪器中具有潜在的应用，可以使用瞬态光机电元件分析复杂的效应。