基于DLS法测量颗粒分布的铁磁流体磁化曲线的确定

Q3 Engineering
Y. Tarasevych, M. Szczęch
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引用次数: 0

摘要

铁磁流体是一种具有约10nm大小的具有磁性的胶体。这些流体用于各种应用。它们的应用受到载体基液的类型、颗粒材料的磁性以及它们的大小和形状的影响。在实际应用中,磁化曲线和初始磁化率是任何铁磁流体最重要的特性。测定磁性的方法有很多种,例如使用磁力计。磁化曲线也可以通过透射电子显微镜(TEM)得到的颗粒分布来确定。然而,这些设备和测试的成本相对较高。本文介绍了一种利用动态光散射(DLS)法根据粒径测量确定磁化曲线的方法。此外,有必要知道铁磁流体的饱和磁化。所得的磁化特性与其他出版物中描述的磁化曲线进行了比较。本文的目的是提出一种方法,并确定各种颗粒分布参数对铁磁流体特性的影响。该方法的优点是在使用DLS方法进行测量时需要小体积的铁磁流体。测量速度快,测量结果可用于快速估计铁磁流体的磁性能。这些特性可用于不同设备的分析(数学或数值计算),如磁密封,磁联轴器,磁阻尼器等。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
DETERMINATION OF FERROFLUID MAGNETISATION CURVEBASED ON THE MEASUREMENT OF PARTICLE DISTRIBUTIONOBTAINED BY THE DLS METHOD
Ferrofluid is a colloid with particles of about 10nm that show magnetic properties. These fluids are used in avariety of applications. Their application is affected by the type of carrier base liquid, the magnetic propertiesof the particle's material, and their size and shape. In practical applications, the magnetisation curve andthe initial magnetic susceptibility are the most important characteristics of any ferrofluid. There are manymethods for determining magnetic characteristics, e.g., using magnetometers. The magnetisation curve canalso be determined on the particle distribution obtained using a transmission electron microscope (TEM).However, the cost of these devices and tests is relatively high. This paper describes a method for determiningthe magnetisation curve based on particle size measurements using the dynamic light scattering (DLS)method. Also, it is necessary to know the saturation magnetisation of the ferrofluid. The obtained magneticcharacteristics were compared with magnetisation curves described in other publications. The purpose ofthis paper is to present the method and determine the influence of various particle distribution parameterson ferrofluid characteristics. The advantage of the method is that a small volume of ferrofluid is requiredin measurements using the DLS method. The measurement can be performed quickly, and the result can beused to estimate the magnetic properties of ferrofluids quickly. These characteristics can be used in analyses(mathematical or numerical calculations) of different devices such as magnetic seals, magnetic couplings,magnetic dampers, etc.
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来源期刊
Tribologia: Finnish Journal of Tribology
Tribologia: Finnish Journal of Tribology Materials Science-Surfaces, Coatings and Films
CiteScore
2.20
自引率
0.00%
发文量
4
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