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首页> 外文期刊>Acta biomaterialia >Fabrication and in vitro characterization of magnetic hydroxycarbonate apatite coatings with hierarchically porous structures.
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Fabrication and in vitro characterization of magnetic hydroxycarbonate apatite coatings with hierarchically porous structures.

机译：具有分级多孔结构的磁性羟基碳酸盐磷灰石涂层的制备和体外表征。

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Hydroxycarbonate apatite/Fe(3)O(4) composite coatings (MHACs) with hierarchically porous structures were fabricated by electrophoretic deposition of CaCO(3)/Fe(3)O(4) particles on Ti6Al4V substrates followed by treatment with phosphate buffer solution (PBS) at 37 degrees C. The effects of Fe(3)O(4) on the conversion rate of calcium carbonate to hydroxycarbonate apatite and the porous structures and in vitro bioactivity of MHACs were investigated. After soaking CaCO(3)/Fe(3)O(4) coatings in PBS, hydroxycarbonate apatite nucleates heterogeneously on the surfaces of CaCO(3)/Fe(3)O(4) particles and forms a plate-like structure. Fe(3)O(4) increases the velocity of nucleus formation of hydroxycarbonate apatite. After soaking for 1day, the percentage of unreacted calcium carbonate for MHACs is approximately 9.1%, lower than the approximately 41.0% for hydroxycarbonate apatite coatings (HCACs). As the CaCO(3)/Fe(3)O(4) coatings are converted to MHACs, macropores with a pore size of approximately 4mum on the coatings and mesopores with a pore size of approximately 3.9nm within the hydroxycarbonate apatite plates are formed. The mesopores remain in the MHACs after treatment with PBS for 9 days, while they disappear in the HCACs. Simulated body fluid immersion tests reveal that Fe(3)O(4) improves the in vitro bioactivity of biocoatings. The amount of bone-like apatite precipitated on the surfaces of MHACs is greater than that on the surfaces of HCACs.
机译：通过在Ti6Al4V基板上电泳沉积CaCO（3）/ Fe（3）O（4）颗粒，然后用磷酸盐缓冲溶液处理，制备了具有层次多孔结构的羟基磷灰石/ Fe（3）O（4）复合涂层（MHAC） （PBS）在37摄氏度下进行。研究了Fe（3）O（4）对碳酸钙向羟基碳酸钙磷灰石转化率以及MHAC的多孔结构和体外生物活性的影响。将CaCO（3）/ Fe（3）O（4）涂层浸泡在PBS中后，羟基碳酸盐磷灰石在CaCO（3）/ Fe（3）O（4）颗粒的表面上异质成核，并形成板状结构。 Fe（3）O（4）增加了羟基碳酸盐磷灰石的核形成速度。浸泡1天后，MHAC的未反应碳酸钙百分比约为9.1％，低于碳酸盐磷灰石涂层（HCAC）的约41.0％。当将CaCO（3）/ Fe（3）O（4）涂层转化为MHAC时，在羟基碳酸盐磷灰石板中形成了孔径约4mum的大孔和孔径约3.9nm的中孔。用PBS处理9天后，中孔保留在MHAC中，而在HCAC中消失。模拟的体液浸没测试表明，Fe（3）O（4）改善了生物涂层的体外生物活性。 MHAC表面沉淀的骨状磷灰石的量大于HCAC表面沉淀的骨状磷灰石的量。

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