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Bioactive HA/TiO_2 coating on magnesium alloy for biomedical applications

机译：用于生物医学应用的镁合金上的生物活性HA / TiO_2涂层

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Magnesium alloys are new class of biodegradable alloys having many favourable properties to overcome the limitations of currently used biomedical alloys. Recently, several coatings have been developed to overcome their higher degradation rate. In this regard, a new attempt has been made to develop Hydroxyapatite and Hydroxyapatite/TiO_2 coatings on magnesium alloys to increase the biocompatibility and reduce the corrosion rate. The coated surfaces were characterized by Fourier-Transform Infrared Spectroscopy (FT-IR), X-ray Diffraction Analysis (XRD), Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray (EDX) Spectroscopy, Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM). Contact angle measurements proved higher hydrophilic nature of HA/TiO_2 coating compared to HA coating. Invito studies showed that HA-TiO_2 coated alloy exhibited higher osteoinduction compared to HA coated alloy. Hydrogen evolution studies and corrosion studies confirmed greater reduction in degradation rate of HA/TiO_2 coated alloy. Vickers microhardness test also showed enhancement in mechanical strength of the composite coated alloy compared to HA coated alloy. Three point bend test depicted better adherence of the HA/ TiO_2 coating compared to HA coating on the substrate. Cell culture studies proved higher cell attachment and proliferation on composite coated alloy by controlling the release of magnesium ions into the surrounding body tissue.
机译：镁合金是具有许多有利特性的新型可生物降解合金，以克服目前使用的生物医学合金的局限性。最近，已经开发了几种涂料来克服其较高的降解速率。在这方面，已经进行了新的尝试来开发镁合金上的羟基磷灰石和羟基磷灰石/ TiO 2涂层，以提高生物相容性并降低腐蚀速率。涂层表面通过傅里叶变换红外光谱（FT-IR），X射线衍射分析（XRD），扫描电子显微镜（SEM）和能量色散X射线（EDX）光谱，原子力显微镜（AFM）和透射电子显微镜（TEM）。接触角测量证明与HA涂层相比，HA / TiO_2涂层具有更高的亲水性。体内研究表明，与HA涂层合金相比，HA-TiO_2涂层合金具有更高的骨诱导性。氢析出研究和腐蚀研究证实，HA / TiO_2涂层合金的降解速率有较大降低。维氏显微硬度测试还显示，与HA涂层合金相比，复合涂层合金的机械强度有所提高。三点弯曲测试表明与基材上的HA涂层相比，HA / TiO_2涂层具有更好的附着力。细胞培养研究证明，通过控制镁离子向周围人体组织的释放，复合涂层合金具有更高的细胞附着力和增殖能力。

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