Transitional behaviour between biphasic lubrication and soft elastohydrodynamic lubrication of poly(vinyl alcohol) hydrogel using microelectromechanical system pressure sensor
Transitional behaviour between biphasic lubrication and soft elastohydrodynamic lubrication of poly(vinyl alcohol) hydrogel using microelectromechanical system pressure sensor
复制标题
使用微机电系统压力传感器的聚（乙烯醇）水凝胶的双相润滑和软弹流润滑之间的过渡行为
DOI：
10.1049/bsbt.2018.0001
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发表时间：
2018
影响因子：
--
通讯作者：
Teruo Murakami
中科院分区：
文献类型：
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作者：
Nobuo Sakai;Seido Yarimitsu;Yoshinori Sawae;Mochimitsu Komori;Teruo Murakami
软水凝胶材料有望成为具有自适应多模式润滑协同功能的仿生人工软骨候选材料。在水凝胶材料的边界润滑模式中，双相润滑机制协同发挥其功能。在流体动力润滑模式中，优选润滑表面是不可渗透的，以捕获接触表面中的流体压力，而实际的双相材料（如水凝胶）是具有表面孔隙率的可渗透材料。这表明，可渗透双相材料中的间隙流体加压可以在较低滑动速度条件下有助于显着的流体负载支撑。因此，作者研究了从边界润滑模式到软弹流体动力润滑模式的转变中如何出现相反的流体压力效应。实验中采用小型压力传感器测量滑动条件下的原位流体压力。尽管本研究的实验条件是选择性的，但结果表明双相表面可能会产生负面影响，其中可渗透表面降低了流体动力流体压力。这意味着当水凝胶材料用作承载材料时，应该管理和增强在宽操作范围内的双相润滑能力。
The soft hydrogel material is expected for a candidate material as biomimetic artificial cartilage with synergistic functionalities of adaptive multimode lubrication. In boundary lubrication mode of hydrogel material, the biphasic lubrication mechanism cooperatively exerts its functionality. In hydrodynamic lubrication mode, it is preferable that the lubricating surfaces be impermeable to trap the fluid pressure in contact surfaces, whereas the actual biphasic material like a hydrogel is a permeable material with surface porosity. It is indicated that the interstitial fluid pressurisation in the permeable biphasic material can contribute to significant fluid load support under lower sliding speed condition. So, the authors examined how the contrary fluid pressure effect appears in the transition from the boundary lubrication mode to soft elastohydrodynamic lubrication mode. In the experiment, a small pressure sensor was utilised to measure the in‐situ fluid pressure in sliding condition. Although the experimental condition of this study was selective, the result showed a possibility of the negative effect of the biphasic surface, in which the permeable surface diminished the hydrodynamic fluid pressure. This means that one should manage and enhance the biphasic lubrication abilities in wide operation range when the hydrogel material was used as a load bearing material.