Micro-fluidic actuation using magnetic artificial cilia
Micro-fluidic actuation using magnetic artificial cilia
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DOI：
10.1039/b908578e
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发表时间：
2009-01-01
期刊：
影响因子：
6.1
通讯作者：
van IJzendoorn, Leo J.
中科院分区：
文献类型：
--
作者：
Fahrni, Francis;Prins, Menno W. J.;van IJzendoorn, Leo J.
我们展示了先进的流体操纵使用磁性聚合物人工纤毛的微流体通道的墙壁上。在自然界中，纤毛是覆盖在微生物表面的小毛发，使它们能够在微观尺度上操纵流体。天然纤毛的不对称运动对于获得净流体流动至关重要。我们已经开发了一种由铁纳米颗粒和聚二甲基硅氧烷制成的铁磁聚合物，并描述了一种可以将该材料构造成长300 mm的高纵横比的人工纤毛的方法。这些人工纤毛由紧凑的外部电磁体产生的均匀旋转磁场（mu（0）H < 50 mT）驱动。当纤毛具有垂直于磁场矢量的旋转平面的回复磁化时，可以产生涉及扭转的不对称运动。人造纤毛可以在流体中被致动，频率高达类似于50 Hz。在微流体室中的水溶液中，我们能够产生旋转以及平移流体运动，流体速度高达0.5 mm s（-1）。
We demonstrate advanced fluid manipulations using magnetic polymeric artificial cilia on the walls of a microfluidic channel. In nature, cilia are little hairs covering the surface of micro-organisms which enable them to manipulate a fluid on the micro-scale. The asymmetric movement of natural cilia is crucial to obtain a net fluid flow. We have developed a ferromagnetic polymer made from iron nanoparticles and polydimethylsiloxane, and describe a process that can structure the material into high aspect ratio lying artificial cilia with a length of 300 mm. These artificial cilia were actuated with a homogeneous rotating magnetic field (mu(0)H < 50 mT) generated with a compact external electromagnet. An asymmetric movement involving torsion could be created when the cilia were provided with a remanent magnetisation perpendicular to the plane of rotation of the magnetic field vector. The artificial cilia could be actuated in fluid up to a frequency of similar to 50 Hz. In an aqueous solution in a microfluidic chamber we were able to generate rotational as well as translational fluid movements with fluid velocities up to similar to 0.5 mm s(-1).