A coating with hydrogel@nanostructure on Ti surfaces via controllable Nano-mechanical interlocking

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-30 DOI:10.1016/j.surfcoat.2024.131508

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Abstract

The elasticity mismatch between Ti and tissue limits the performance of Ti medical devices. How to create a coating with mimicking natural soft tissue stiffness and possessing strong mechanical bond is a challenge in implant manufacturing. Here, we developed a combined coating, that is, an anodized Ti surface (ATS) with nanostructures coated with a layer of PAAm hydrogel with tunable elasticity. Due to the nano-mechanical interlocking and hydrogen bonding synergy, the PAAm hydrogel layer was tightly anchored in nanostructures on the ATS. By regulating the oxidation voltage, nanostructures including nanopores, nanotubes, and punch-through nanotubes were fabricated on the ATS, and these three kinds of anodized nanostructures increase the porosity of the ATS sequentially. The lap shear test has shown that the shear strength increases linearly with increasing the porosity, and the shear strength of the punch-through nanotube structures with the PAAm hydrogel coating reaches 59.28 kPa. The adhesion mechanism between the anodized Ti nanostructures and the PAAm hydrogel coating is mainly due to the nano-mechanical interlocking and hydrogen bonding synergy, which was proven by morphology analysis, XRD, and ATR-FTIR characterization of the samples subjected to lap shear load. The hydrogel-nanostructures coating has demonstrated the potential to be applied in Ti medical devices.

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通过可控纳米机械互锁在钛表面形成水凝胶@纳米结构涂层

钛和组织之间的弹性不匹配限制了钛医疗器械的性能。如何制造一种既能模拟天然软组织硬度又能具有强大机械粘合力的涂层是植入物制造中的一项挑战。在这里，我们开发了一种组合涂层，即在阳极氧化钛表面（ATS）的纳米结构上涂覆一层具有可调弹性的 PAAm 水凝胶。由于纳米机械互锁和氢键协同作用，PAAm 水凝胶层被紧密地固定在阳极氧化钛表面的纳米结构上。通过调节氧化电压，在 ATS 上形成了包括纳米孔、纳米管和穿孔纳米管在内的纳米结构，这三种阳极氧化纳米结构依次增加了 ATS 的孔隙率。搭接剪切试验表明，剪切强度随孔隙率的增加而线性增加，涂覆 PAAm 水凝胶的穿孔纳米管结构的剪切强度达到 59.28 kPa。阳极氧化 Ti 纳米结构与 PAAm 水凝胶涂层之间的粘附机理主要是由于纳米机械互锁和氢键协同作用，这一点已通过对承受搭接剪切载荷的样品进行形貌分析、XRD 和 ATR-FTIR 表征得到证实。水凝胶纳米结构涂层已证明具有应用于钛医疗器械的潜力。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.