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首页> 外文期刊>Advanced Functional Materials >Nanoporous Substrate-Infiltrated Hydrogels: a Bioinspired Regenerable Surface for High Load Bearing and Tunable Friction
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Nanoporous Substrate-Infiltrated Hydrogels: a Bioinspired Regenerable Surface for High Load Bearing and Tunable Friction

机译：纳米孔基质渗透的水凝胶：生物启发的可再生表面，用于高负荷承载和可调摩擦

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摘要

Nature has successfully combined soft matter and hydration lubrication to achieve ultralow friction even at relatively high contact pressure (e.g., articular cartilage). Inspired by this, hydrogels are used to mimic natural aqueous lubricating systems. However, hydrogels usually cannot bear high load because of solvation in water environments and are, therefore, not adopted in real applications. Here, a novel composite surface of ordered hydrogel nanofiber arrays confined in anodic aluminum oxide (AAO) nanoporous template based on a soft/hard combination strategy is developed. The synergy between the soft hydrogel fibers, which provide excellent aqueous lubrication, and the hard phase AAO, which gives high load bearing capacity, is shown to be capable of attaining very low coeffcient of friction (<0.01) under heavy load (contact pressures approximate to 2 MPa). Interestingly, the composite synthetic material is very stable, cannot be peeled off during sliding, and exhibits desirable regenerative (self-healing) properties, which can assure long-term resistance to wear. Moreover, the crosslinked polymethylacrylic acid hydrogels are shown to be able to promptly switch between high friction (>0.3) and superlubrication (approximate to 10(-3)) when their state is changed from contracted to swollen by means of acidic and basic actuation. The mechanisms governing ultralow and tunable friction are theoretically explained via an in-depth study of the chemomechanical interactions responsible for the behavior of these substrate-infiltrated hydrogels. These findings open a promising route for the design of ultra-slippery and smart surface/interface materials.
机译：大自然成功地将软物质和水合润滑相结合，即使在相对较高的接触压力（例如，关节软骨）下也能实现超低摩擦。受此启发，水凝胶被用于模仿天然的水性润滑系统。但是，水凝胶由于在水环境中的溶剂化作用通常不能承受高负荷，因此在实际应用中不被采用。在这里，基于软/硬结合策略，开发了一种新型的有序水凝胶纳米纤维阵列的复合表面，该阵列限制在阳极氧化铝（AAO）纳米多孔模板中。柔软的水凝胶纤维（可提供出色的水润滑性能）与硬相的AAO（可提供高承载能力）之间的协同作用显示，在重载（接触压力大约为1）时，其摩擦系数非常低（<0.01）。至2 MPa）。有趣的是，该复合合成材料非常稳定，在滑动过程中不会剥离，并且具有理想的再生（自修复）性能，可以确保长期的耐磨性。此外，当通过酸性和碱性驱动使交联聚甲基丙烯酸水凝胶的状态从收缩状态变为溶胀状态时，它们能够在高摩擦（> 0.3）和超润滑（约10（-3））之间迅速切换。理论上，通过深入研究负责这些底物渗透水凝胶行为的化学机械相互作用，来解释控制超低摩擦和可调摩擦的机理。这些发现为超光滑和智能表面/界面材料的设计开辟了一条有希望的途径。

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  • 来源
    《Advanced Functional Materials》 |2015年第47期|7366-7374|共9页
  • 作者

    Ma Shuanhong; Scaraggi M.; Wang Daoai; Wang Xiaolong; Liang Yongmin; Liu Weimin; Dini Daniele; Zhou Feng;

  • 作者单位

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China|China Univ, Chinese Acad Sci, Beijing 100049, Peoples R China;

    Univ Salento, DII, I-73100 Monteroni Lecce, Italy;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;

    Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2AZ, England;

    Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    gel-fiber arrays; nanoporous; regenerable; tunable friction; lubrication;

    机译：凝胶纤维阵列;纳米孔;可再生;可调摩擦;润滑;

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