Advances in Understanding Hydrogel Lubrication
Advances in Understanding Hydrogel Lubrication
复制标题
水凝胶润滑的研究进展
DOI：
10.3390/colloids4040054
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发表时间：
2020-11
影响因子：
2.4
通讯作者：
Tooba Shoaib;R. Espinosa‐Marzal
中科院分区：
文献类型：
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作者：
Tooba Shoaib;R. Espinosa‐Marzal
自问世以来，水凝胶在多个领域获得了普及，最显著的是在生物医学研究和工业领域。由于其与生物摩擦系统的相似性，人们对水凝胶进行了大量的研究，以阐明生物润滑机制及其作为替代材料的可能应用。这篇综述的重点是润滑机制，涵盖了试图量化水凝胶复杂摩擦特性的摩擦模型。从基于聚合物物理建立的模型到水化润滑的概念，讨论了其适用性的假设和条件。基于前人的模型和我们自己的实验结果，我们提出了水凝胶摩擦的粘-粘模型。该模型考虑了由固体表面和孔弹性松弛提供的聚合物网络的限制以及复杂流体的（非）牛顿剪切对摩擦力的影响，并量化了水凝胶-固体界面的摩擦响应。最后，在现有知识的基础上，概述了未来研究的潜在领域。
Since their inception, hydrogels have gained popularity among multiple fields, most significantly in biomedical research and industry. Due to their resemblance to biological tribosystems, a significant amount of research has been conducted on hydrogels to elucidate biolubrication mechanisms and their possible applications as replacement materials. This review is focused on lubrication mechanisms and covers friction models that have attempted to quantify the complex frictional characteristics of hydrogels. From models developed on the basis of polymer physics to the concept of hydration lubrication, assumptions and conditions for their applicability are discussed. Based on previous models and our own experimental findings, we propose the viscous-adhesive model for hydrogel friction. This model accounts for the effects of confinement of the polymer network provided by a solid surface and poroelastic relaxation as well as the (non) Newtonian shear of a complex fluid on the frictional force and quantifies the frictional response of hydrogels-solid interfaces. Finally, the review delineates potential areas of future research based on the current knowledge.