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Aqueous deposition of calcium phosphates and silicate substituted calcium phosphates on magnesium alloys

机译：磷酸钙和硅酸盐取代的磷酸钙在镁合金上的水沉积

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摘要

Attempts were made to deposit homogeneous films of calcium phosphates (CaPs) on two magnesium alloy systems, AZ31 and Mg-4Y, through an aqueous phosphating bath method. The deposition of silicate substituted CaPs by this aqueous method was also explored as silicate substitution is believed to increase the bioactivity of CaPs. The effect of doped and undoped coatings on the in vitro degradation and bioactivity of both alloy systems was studied. FTIR and EDX confirmed the deposition of Ca, P, and Si on both alloys and the coatings appeared to consist primarily biphasic mixtures of hydroxyapatite and (3-TCP. These largely inhomogeneous coatings, as observed by SEM, were not shown to have any significant effect on maintaining the physiological pH of the culture medium in comparison to the uncoated samples, as the pH remained approximately in the 8.4-8.7 range. Interestingly, despite similar pH profiles between the coated and uncoated samples, CaP coatings affected the degradation of both alloys. These doped and undoped calcium phosphate coatings were observed to decrease the degradation of AZ31 whereas they increased the degradation of Mg-4Y. In vitro studies on cell attachment using MC3T3-E1 mouse osteoblasts showed that between the uncoated alloys, Mg-4Y appeared to be the more biocom-patible of the two. Silicate substituted CaP coatings were observed to increase the cell attachment on AZ31 compared to bare and undoped CaPs coated samples, but did not have as great of an effect on increasing cell attachment on Mg-4Y.
机译：尝试通过水相磷化浴法在两个镁合金系统AZ31和Mg-4Y上沉积均匀的磷酸钙（CaPs）膜。还研究了通过这种水性方法沉积硅酸盐取代的CaPs的情况，因为据信硅酸盐取代会增加CaPs的生物活性。研究了掺杂和未掺杂涂层对两种合金体系的体外降解和生物活性的影响。 FTIR和EDX证实，Ca，P和Si在两种合金上的沉积，并且涂层似乎主要由羟基磷灰石和（3-TCP）的两相混合物组成。通过SEM观察，这些基本上不均匀的涂层没有显示出任何显着的与未涂覆样品相比，由于保持pH值大约在8.4-8.7范围内，对保持培养基的生理pH的影响。有趣的是，尽管涂覆和未涂覆样品之间的pH值相似，但CaP涂层影响两种合金的降解观察到这些掺杂和未掺杂的磷酸钙涂层减少了AZ31的降解，却增加了Mg-4Y的降解。使用MC3T3-E1小鼠成骨细胞进行的细胞附着体外研究表明，在未涂覆的合金之间，Mg-4Y似乎可以两者相比具有更高的生物相容性。与裸露和未掺杂的CaPs相比，硅酸盐取代的CaP涂层可增加AZ31上的细胞附着。样品，但对增加细胞对Mg-4Y的附着没有太大影响。

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  • 来源
    《Materials Science and Engineering》 |2011年第20期|p.1695-1702|共8页
  • 作者

    Satish S. Singh; Abhijit Roy; BoeunLee; Prashant N.Kumta;

  • 作者单位

    Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA;

    Department ofBioengineering University of Pittsburgh, Pittsburgh, PA 15261, USA;

    Department ofBioengineering University of Pittsburgh, Pittsburgh, PA 15261, USA;

    Department of Chemical & Petroleum Engineering, University of Pittsburgh, Pittsburgh, PA 15261, USA,Department ofBioengineering University of Pittsburgh, Pittsburgh, PA 15261, USA,Center for Craniofacial Regeneration, University of Pittsburgh, Pittsburgh, PA 15261, USA,Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA 15261, USA,Center for Complex Engineered Multifunctional Materials, University of Pittsburgh, Pittsburgh, PA 15261, USA;

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  • 正文语种 eng
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  • 关键词

    magnesium; calcium phosphates; aqueous;

    机译：镁;磷酸钙;水性的;

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