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Highly durable and biocompatible periodical Si/DLC nanocomposite coatings
Nanoscale ( IF 6.7 ) Pub Date : 2018-02-01 00:00:00 , DOI: 10.1039/c7nr06762c
Oleksiy V. Penkov 1, 2, 3, 4 , Mahdi Khadem 1, 2, 3, 4, 5 , Jung-Seung Lee 2, 3, 4, 6 , Mehdi Kheradmandfard 7, 8, 9, 10, 11 , Chang-Lae Kim 1, 2, 3, 4, 5 , Seung-Woo Cho 2, 3, 4, 6 , Dae-Eun Kim 1, 2, 3, 4, 5
Affiliation  

Functional nanocomposite coatings comprised of periodically stacked nanolayers of diamond-like carbon (DLC) and amorphous silicon were developed for biomedical applications. The periodical nanocomposite structure provided high surface durability while silicon aided in reducing the residual stress. The structural, mechanical, tribological, and biomedical properties of the Si/DLC coatings deposited by magnetron sputtering were investigated systematically. The effect of the negative substrate bias on the structure and properties of the coatings was also assessed. The coatings demonstrated high durability and high biocompatibility. The bias voltage and bias mode affected both the hardness and residual stress of the Si/DLC coatings. Particularly, application of 60 V negative bias during the DLC layer deposition resulted in the lowest wear rate. FEM simulations showed that the wear resistance of the coatings was dictated by the hardness as well as the adhesion between the coatings and a chromium sub-layer. The periodical alternation of Si and DLC nanolayers led to a significant improvement of MC3T3 cell adhesion compared to the previously published data for Si-DLC composites.

中文翻译:

高度耐用且生物相容的周期性Si / DLC纳米复合涂层

已开发出由周期性堆叠的类金刚石碳(DLC)和非晶硅组成的纳米层组成的功能性纳米复合材料涂层,用于生物医学应用。周期性的纳米复合材料结构提供了较高的表面耐久性,而硅有助于减少残留应力。系统地研究了磁控溅射沉积的Si / DLC涂层的结构,力学,摩擦学和生物医学性能。还评估了负基材偏压对涂层结构和性能的影响。该涂料显示出高耐久性和高生物相容性。偏置电压和偏置模式会影响Si / DLC涂层的硬度和残余应力。特别是,在DLC层沉积过程中施加60 V负偏压会导致最低的磨损率。有限元模拟表明,涂层的耐磨性取决于硬度以及涂层与铬子层之间的附着力。与先前发布的Si-DLC复合材料的数据相比,Si和DLC纳米层的周期性交替导致MC3T3细胞粘附力的显着改善。
更新日期:2018-02-01
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