GOALI: Ferrohydrodynamic Applications to Nanotechnology

摘要CTS-0084070 M。Zahn，MIT将研究纳米级铁磁颗粒（尺寸约10 nm）的胶体悬浮液在有和没有载液的情况下的行为。 当由磁场驱动或控制时，这样的流动可以显示对特别感兴趣的实际应用的潜在兴趣的许多方面是纳米机电设备（NEMS）。 PI计划与工业合作伙伴密切合作，从根本上审视以下流程：1.通道流的宽度的顺序为100-1000纳米：在交变和移动磁场下，它们可以实现显着的流速只有一个中等（甚至反向）的有效粘度。2.旋转运动可以通过通道表面上合适的纳米线圈阵列施加到无流体介质中的纳米颗粒。相反的效果，即施加流体力的颗粒，其旋转运动将反过来感应电流进入纳米线圈。4.机械纳米元件的制造可以通过使用高温下呈液态但在室温下呈固态的材料来完成。 因此，可以在高温下施加必要的磁场以给出所需的流动形状，然后冷冻。 齿轮形状似乎是一个简单的第一步来测试这种技术。5.将测试使用磁流体或表面活性剂来降低表面张力，从而改善部件形状的细节质量。在实验/设计层面，我们与Ferrofluids Corporation进行了密切合作。

AbstractCTS-0084070M. Zahn, MITThe behavior of colloidal suspensions of nanoscale ferromagnetic particles (~10 nm in size), with and without carrier fluid, will be investigated. Such flows, when driven or controlled by magnetic fields, can display a number of aspects of potential interest to practical applications of special interest are nano-electromechanical devices (NEMS). The PI plans to take a fundamental look at the following flows, in close cooperation with industrial partners: 1. Channel flows with a width of the order of 100-1000 nm: under alternating and traveling magnetic fields, they can achieve significant flow rates with only a moderate (or even reverse) effective viscosity.2. Rotational motion can be applied to nanoparticles in a fluid-free medium by a suitable array of nanocoils on the surface of the channel.3. The reverse effect, i.e. applying fluid force to particles, whose rotational motion will induce in turn an electric current into the nanocoils.4. The fabrication of mechanical nanocomponents can be accomplished by using a material which is in the liquid state of high temperature, but in the solid state at room temperature. Thus it is possible to apply at high temperature the magnetic fields necessary to give the desired flow shape, and then freeze. Gear shapes seem to be an easy first step to test this technique.5. The use of nonmagnetic fluids, or of surfactants, will be tested as way to reduce surface tension and therefore improve the detailed quality of the component shape.There is a strong collaboration contemplated with the Ferrofluids Corporation, at both experimental/design levels.