基于触变性水凝胶的仿生低磨损耐用润滑界面系统

IF 1.6 Q4 ENGINEERING, BIOMEDICAL Biosurface and Biotribology Pub Date : 2023-09-07 DOI:10.1049/bsb2.12063
Bin He, Chen Wang, Xiong Xiong, Jun Li, Zhongmin Jin, Shuxin Qu
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引用次数: 0

摘要

受关节关节良好耐磨性和润滑性的启发,将触变水凝胶与表面多孔超高分子量聚乙烯(UHMWPE)相结合,提出了一种新型的仿生界面体系。触变水凝胶,由明胶、海藻酸钠、单宁酸和Ca2+弱交联合成(Gel‐TA‐Alg@Ca2+),由于其在加载时的剪切变薄而被用作润滑剂,然后在卸载时,回收粘度有利于保留在UHMWPE的表面孔隙中。以羟基磷灰石颗粒为成孔剂,控制其孔隙率、孔径、表面粗糙度和表面能(PE‐HA),制备了表面多孔UHMWPE。凝胶-TA-Alg@Ca2+往复摩擦学试验后,与生理盐水和小牛血清溶液润滑相比,平均摩擦系数和磨损因子显著降低。值得注意的是,Gel‐TA‐Alg@Ca2+仍然保持触变性,并且即使在摩擦学测试7200分钟后仍储存在UHMWPE的表面孔隙中。因此,由于表面多孔结构和触变性的协同作用,可以实现持久润滑。Stribeck曲线显示了PE‐30HA在三种润滑剂下的混合、弹流动力学和流体动力学特征,但没有边界润滑。本研究结果可能为构建人工关节耐用润滑仿生关节界面系统提供潜在的应用前景。
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Bio-inspired low wear and durable lubrication interfacial system based on thixotropic hydrogel for artificial joints

Inspired by the excellent wear resistance and lubrication of articular joints, a novel bionic interfacial system was proposed by combining thixotropic hydrogel with surface porous Ultrahigh Molecular Weight Polyethylene (UHMWPE). Thixotropic hydrogel, synthesised by gelatin, alginate sodium, tannic acid and weak crosslinking by Ca2+ (Gel-TA-Alg@Ca2+), was used as a lubricant due to its shear-thinning when loaded, then the recovery viscosity to be benefitted for reserving in surface pores on UHMWPE when unloaded. Surface porous UHMWPE was fabricated by using hydroxyapatite particles as porogen to control its porosity, pore size, surface roughness and surface energy (PE-HA). Gel-TA-Alg@Ca2+ significantly reduced average coefficients of friction and wear factors compared to those under normal saline and calf serum solution lubricating after reciprocating tribological testing. Notably, Gel-TA-Alg@Ca2+ still maintained thixotropy and was stored in surface pores of UHMWPE even after tribological testing for 7200 min. Thus, durable lubrication could be realised due to the synergistic effect of surface porous structure and thixotropy. Stribeck curves showed the characterisations of mixed, elastohydrodynamic and hydrodynamic, but without boundary lubrications for PE-30HA under three lubricants. The present results might provide the potential application to construct the durable lubrication bionic articular joint interfacial system for artificial joints.

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来源期刊
Biosurface and Biotribology
Biosurface and Biotribology Engineering-Mechanical Engineering
CiteScore
1.70
自引率
0.00%
发文量
27
审稿时长
11 weeks
期刊最新文献
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