A new formulation is proposed to lubricate tribopairs in extreme conditions where the amount of lubricant is small and the lubricating region highly confined. It is composed of non-magnetic solid lubricants dispersed in an oil-based ferrofluid. When this inverse ferrofluid (IFF) is magnetically activated, the lubricant particles are subjected to magnetophoretic forces. By using appropriate magnetic field gradients, they can be driven to the region of interest and thus control the friction locally. The rheological and tribological performances of three IFF formulations are evaluated in several conditions of applied magnetic field strength and shear flow rates.

中文翻译：

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使用逆磁流体方法设计智能润滑剂

提出了一种新配方，用于在润滑剂量很少且润滑区域高度受限的极端条件下润滑摩擦对。它由分散在油基铁磁流体中的非磁性固体润滑剂组成。当这种逆铁磁流体 (IFF) 被磁激活时，润滑剂颗粒会受到磁泳力的影响。通过使用适当的磁场梯度，它们可以被驱动到感兴趣的区域，从而局部控制摩擦。在施加磁场强度和剪切流速的几种条件下评估了三种 IFF 配方的流变学和摩擦学性能。