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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Rheology of a ferrofluid based on nanodisc cobalt particles
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Rheology of a ferrofluid based on nanodisc cobalt particles

机译：基于纳米圆盘钴颗粒的铁磁流体的流变学

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摘要

Rheological investigations as well as theoretical studies on ferrofluids have shown strong fieldand shear dependent changes in viscosity, which are correlated with the formation ofchain-like clusters of magnetic nanoparticles. Moreover, the formation of these clusters leadsto the appearance of viscoelastic effects or other non-Newtonian features in ferrofluids in thepresence of a magnetic field. Previous investigations were carried out with differentlycomposed ferrofluids, all of them containing particles of nearly spherical shape, but differingin the size of the nanoparticles, the volume concentration and the magnetic material. In thework presented here a ferrofluid with non-spherical cobalt nanoparticles is used, to get moreinformation about the influence of the shape of the nanoparticles on their interparticleinteraction and the resulting rheological behaviour of the suspension. For the experiments anespecially designed stress controlled rheometer has been used. Experiments on yield stress aswell as measurements of the magnetoviscous effect have been performed for this ferrofluidwith nanodisc particles for different magnetic field strengths. The results from the yield stressexperiments have been compared with those achieved for a cobalt-based ferrofluid containingspherical nanoparticles.
机译：铁磁流体的流变学研究和理论研究表明，强磁场和剪切相关的粘度变化与磁性纳米颗粒链状簇的形成有关。而且，这些簇的形成导致在磁场存在下铁磁流体中出现粘弹性效应或其他非牛顿特征。以前的研究是用不同组成的铁磁流体进行的，它们都包含接近球形的颗粒，但是纳米颗粒的大小，体积浓度和磁性材料不同。在本文介绍的工作中，使用了具有非球形钴纳米颗粒的铁磁流体，以获取有关纳米颗粒形状对其相互作用的影响以及悬浮液流变行为的更多信息。对于实验，已经使用了未经特别设计的应力控制流变仪。对于具有不同磁场强度的具有纳米圆盘颗粒的铁磁流体，已经进行了屈服应力实验以及磁粘性效应的测量。已将屈服应力实验的结果与含球形球形纳米颗粒的钴基铁磁流体的结果进行了比较。

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