Application of magnetic bearing technology in high-speed centrifugation
Application of magnetic bearing technology in high-speed centrifugation
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DOI：
10.1016/j.ces.2016.03.025
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发表时间：
2016-06-22
影响因子：
4.7
通讯作者：
Nirschl, Hermann
中科院分区：
文献类型：
--
作者：
Konrath, Manuel;Gorenflo, Julie;Nirschl, Hermann
离心机是分离技术中成熟的工具，可处理微米级颗粒悬浮液的高通量。然而，即使是更小的颗粒，也需要极高的离心加速度。为此，我们利用磁力轴承和驱动技术。我们报告了这种非接触式技术在分离实验中的首次应用。所提出的原型基于半连续原理，其中沉积物在转子内积聚，而液体（在分类的情况下包含细小部分）在溢流堰处排出。新型离心机允许转速超过 64k min(-1)。离心加速度高达 C=100,000 且流速高达 0.4 l/min 的参数的广泛变化为本研究提供了良好的实验基础。 10 nm 至 1 μm 之间的三种颗粒系统（银纳米颗粒、二氧化硅纳米颗粒和聚苯乙烯）的切割尺寸和产品损失可通过上述参数精确调节。此外，在比效率方面与市售设备具有良好的可比性。我们认为我们的方法对纳米级分离技术做出了有前途的贡献，而可扩展的高通量方法很少见。 (C) 2016 Elsevier Ltd. 保留所有权利。
Centrifuges represent a well-established tool in separation technology to handle high throughputs of suspensions with micron-sized particles. However, extraordinarily high centrifugal accelerations are required for even smaller particles. For this purpose, we make use of magnetic bearing and drive technology. We report the first application of this contactless technique in separation experiments. The presented prototype is based on a semi-continuous principle, where sediment is built up within the rotor while the liquid (which contains the fine fraction in case of classification) is discharged at the overflow weir. The new centrifuge allows rotational speeds of more than 64k min(-1). A broad variation of parameters with centrifugal accelerations of up to C=100,000 and flow rates of up to 0.4 l/min provides a sound experimental basis for this study. The cut size and the product loss of three particle systems between 10 nm and 1 mu m (silver nanoparticles, silica nanoparticles, and polystyrene) are precisely adjustable via the mentioned parameters. Furthermore, a good comparability with a commercially available device was found regarding the specific efficiency. We consider our approach to be a promising contribution to nanoscale separation technology where scalable high-throughput methods are rare. (C) 2016 Elsevier Ltd. All rights reserved.