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首页> 外文期刊>Acta biomaterialia >Poly (3,4-ethylenedioxythiophene) graphene oxide composite coatings for controlling magnesium implant corrosion
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Poly (3,4-ethylenedioxythiophene) graphene oxide composite coatings for controlling magnesium implant corrosion

机译：聚（3,4-亚乙二氧基噻吩）石墨烯氧化物复合涂料，用于控制镁植入腐蚀

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摘要

Magnesium (Mg) is a promising biodegradable implant material because of its appropriate mechanical properties and safe degradation products. However, in vivo corrosion speed and hydrogen gas production need to be controlled for uses in biomedical applications. Here we report the development of a conducting polymer 3,4-ethylenedioxythiphene (PEDOT) and graphene oxide (GO) composite coating as a corrosion control layer. PEDOT/GO was electropolymerized on Mg samples in ethanol media. The coated Mg samples were subjected to various corrosion tests. The PEDOT/GO coating significantly reduced the rate of corrosion as evidenced by lower Mg ion concentration and pH of the corrosion media. In addition, the coating decreased the evolved hydrogen. Electrochemical analysis of the corroding samples showed more positive corrosion potential, a decreased corrosion current, and an increase in the polarization resistance. PEDOT/GO corrosion protection is attributed to three factors; an initial passive layer preventing solution ingress, buildup of negative charges in the film, and formation of corrosion protective Mg phosphate layer through redox coupling with Mg corrosion. To explore the biocompatibility of the coated implants in vitro, corrosion media from PEDOT/GO coated or uncoated Mg samples were exposed to cultured neurons where PEDOT/GO coated samples showed decreased toxicity. These results suggest that PEDOT/GO coating will be an effective treatment for controlling corrosion of Mg based medical implants.
机译：镁（Mg）是一种有前途的可生物降解的植入材料，因为其适当的机械性能和安全降解产物。然而，需要在体内腐蚀速度和氢气生产中控制用于生物医学应用的用途。在这里，我们报告了导电聚合物3,4-亚乙基硫代己己（PEDOT）和石墨烯氧化物（GO）复合涂层作为腐蚀控制层。 PEDOT / GO在乙醇介质中的MG样品上电聚合。对涂覆的Mg样品进行各种腐蚀试验。 PEDOT / GO涂层显着降低了通过较低的Mg离子浓度和腐蚀介质的pH所证明的腐蚀速率。另外，涂层降低了进化的氢气。腐蚀样品的电化学分析显示出更积极的腐蚀电位，腐蚀电流降低，偏振电阻增加。 PEDOT / GO腐蚀保护归因于三个因素;一种初始被动层防止溶液进入，膜中负电荷的积聚，以及通过氧化还原耦合与Mg腐蚀的腐蚀保护镁磷酸盐层的形成。为了探讨涂覆植入物的体外植入物的生物相容性，从PEDOT / GO涂覆或未涂覆的MG样品中腐蚀介质暴露于培养的神经元，其中PEDOT / GO涂覆样品显示出降低毒性。这些结果表明PEDOT / GO涂层将是控制基于MG的医疗植入物的腐蚀的有效处理。

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