Review: Friction and Lubrication with High Water Content Crosslinked Hydrogels
Review: Friction and Lubrication with High Water Content Crosslinked Hydrogels
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DOI：
10.1007/s11249-020-01352-3
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发表时间：
2020-10
影响因子：
3.2
通讯作者：
Shabnam Z. Bonyadi;M. Hasan;Jiho Kim;Samsul Mahmood;K. Schulze;A. C. Dunn
中科院分区：
文献类型：
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作者：
Shabnam Z. Bonyadi;M. Hasan;Jiho Kim;Samsul Mahmood;K. Schulze;A. C. Dunn
在过去的20年里，随着软水凝胶从新材料转向真正的工程设备的基础，它们的表面摩擦和润滑正在成为它们功能的关键方面。通过控制交联的3D聚合物网络，可以灵活地改变和增强它们的机械和表面性质，从而产生了具有不同表面行为的材料，即使只有相对简单的单一单体组成和交联剂化学。与之相对应的是，随着对水凝胶整体行为的新理解，已经确定了在动态滑动条件下控制润滑性和摩擦响应的机制。在这里，我们回顾了这些努力，仔细检查和确定了驱动高含水率交联水凝胶摩擦学反应的内部和外部影响。讨论了表面结构、弹性、接触响应、电荷、水相互作用和水流的作用，以及目前的合成和测试方法。我们还收集了尚待解决的问题以及未来的需要，以充分了解和开发用于滑动性能的水凝胶的表面性质。
As soft aqueous hydrogels have moved from new materials to the basis for real engineered devices in the last 20 years, their surface friction and lubrication are emerging as critical aspects of their function. The flexibility to alter and augment their mechanical and surface properties through control of the crosslinked 3D polymer networks has produced materials with diverse surface behaviors, even with the relatively simple composition of a single monomer and crosslink chemistry. Correspondingly with new understandings of the bulk behavior of hydrogels has been the identification of the mechanisms that govern the lubricity and frictional response under dynamic sliding conditions. Here we review these efforts, closely examining and identifying the internal and external influences that drive tribological response in high water content crosslinked hydrogels. The roles of surface structure, elasticity, contact response, charge, water interaction and water flow are addressed here as well as current synthesis and testing methods. We also collect open questions as well as the future needs to fully understand and exploit the surface properties of hydrogels for sliding performance.Graphical Abstract