Preparation and investigation of Zn foil/poly(lactic acid) composite films for guiding bone regeneration

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.2024.131537

Hong Cai , Hongxing Wang , Yan Zhang , Huafang Li , Bing Han , Jiayue Shang , Yinuo Zheng , Haitao Zhao

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Abstract

We prepared Zn/Poly(lactic acid) (PLA) composite films for guiding bone regeneration. The surface of Zn foil was modified by micro-arc oxidation, and the composite films with a sandwich structure were prepared using hot pressing method. The morphology, roughness, porosity, and pore size of Zn foil were investigated with the help of laser microscope and SEM. As a result, the rough and porous surface with the S_a value of 2.764±0.071 μm and porosity of 12.5±3.2 % provided a favorable structural basis for subsequent combination between Zn foil and PLA. While the value of S_a for the MAO-Zn/PLA40 composite film was 4.510±0.080 μm. The main component of the oxide layer was ZnO according to the XRD and XPS results. The tensile strength of MAO-Zn/PLA40 composite film increased by 17.7±0.6 % compared with that of Zn/PLA40 composite film. The interface energy decreased from −7.074 kcal/mol for Zn/PLA to −1433.430 kcal/mol for ZnO/PLA and the total energy level of ZnO/PLA composites shifted towards lower direction according to the density of state results. These results illustrated the enhanced interfacial bonding effect between the micro-arc oxide layer and PLA based on mechanical interlocking and electrostatic attraction. Additionally, micro-arc oxidation accelerated the degradation of Zn foil from initial 0.383±0.029 mm/year to 1.245±0.208 mm/year according to the electrochemical performances. This investigation provided an experimental basis and theoretical guidance for regulating the mechanical properties and degradation rate of this kind of membrane.

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制备和研究用于引导骨再生的锌箔/聚（乳酸）复合膜

我们制备了用于引导骨再生的锌/聚乳酸（PLA）复合膜。采用微弧氧化法对锌箔表面进行改性，并用热压法制备出具有三明治结构的复合薄膜。利用激光显微镜和扫描电镜研究了锌箔的形态、粗糙度、孔隙率和孔径。结果表明，表面粗糙且多孔，Sa 值为 2.764±0.071 μm，孔隙率为 12.5±3.2 %，这为后续锌箔与聚乳酸的结合提供了有利的结构基础。而 MAO-Zn/PLA40 复合薄膜的 Sa 值为 4.510±0.080 μm。根据 XRD 和 XPS 结果，氧化层的主要成分是氧化锌。与 Zn/PLA40 复合薄膜相比，MAO-Zn/PLA40 复合薄膜的拉伸强度提高了 17.7±0.6%。界面能从 Zn/PLA 的 -7.074 kcal/mol 下降到 ZnO/PLA 的 -1433.430 kcal/mol，根据状态密度结果，ZnO/PLA 复合材料的总能级向低方向移动。这些结果表明，基于机械互锁和静电吸引，微弧氧化层和聚乳酸之间的界面结合效应增强。此外，根据电化学性能，微弧氧化加速了 Zn 箔的降解，从最初的 0.383±0.029 mm/year 增加到 1.245±0.208 mm/year。这项研究为调节这种膜的机械性能和降解速率提供了实验依据和理论指导。

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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.