Tokarev Alexander, Aprelev Alexey, Zakharov Mikhail N, Korneva Guzeliya, Gogotsi Yury, Kornev Konstantin G
School of Materials Science & Engineering, Clemson University, Clemson, South Carolina 29634, USA.
Rev Sci Instrum. 2012 Jun;83(6):065110. doi: 10.1063/1.4729795.
We report on the development of a multifunctional magnetic rotator that has been built and used during the last five years by two groups from Clemson and Drexel Universities studying the rheological properties of microdroplets. This magnetic rotator allows one to generate rotating magnetic fields in a broad frequency band, from hertz to tens kilohertz. We illustrate its flexibility and robustness by conducting the rheological studies of simple and polymeric fluids at the nano and microscale. First we reproduce a temperature-dependent viscosity of a synthetic oil used as a viscosity standard. Magnetic rotational spectroscopy with suspended nickel nanorods was used in these studies. As a second example, we converted the magnetic rotator into a pump with precise controlled flow modulation. Using multiwalled carbon nanotubes, we were able to estimate the shear modulus of sickle hemoglobin polymer. We believe that this multifunctional magnetic system will be useful not only for micro and nanorheological studies, but it will find much broader applications requiring remote controlled manipulation of micro and nanoobjects.
我们报告了一种多功能磁转子的研发情况，在过去五年中，克莱姆森大学和德雷塞尔大学的两个研究小组构建并使用该磁转子来研究微滴的流变特性。这种磁转子能够在从赫兹到数十千赫兹的宽频带内产生旋转磁场。我们通过在纳米和微观尺度上对简单流体和聚合物流体进行流变学研究，展示了其灵活性和稳健性。首先，我们重现了用作粘度标准的合成油的温度依赖性粘度。在这些研究中使用了悬浮镍纳米棒的磁旋转光谱法。作为第二个例子，我们将磁转子转变为具有精确控制流量调制的泵。使用多壁碳纳米管，我们能够估算镰状血红蛋白聚合物的剪切模量。我们相信，这种多功能磁系统不仅将用于微米和纳米流变学研究，而且还将在需要对微米和纳米物体进行远程控制操作的更广泛应用中找到用武之地。
