Lin Changjian, Han Huijuan, Zhang Fang, Li Aimin
Department of Chemistry, Xiamen University, China.
J Mater Sci Mater Med. 2008 Jul;19(7):2569-74. doi: 10.1007/s10856-007-3196-1. Epub 2007 Jul 10.
A composite coating of hydroxyapatite (HA)/multi-walled carbon nanotubes (MWNTs) has been fabricated by electrophoretic deposition (EPD). The nano powders of HA and MWNTs were dispersed in ethanol with total concentration of 0.005 g/mL and MWNTs 20% and 30% contents (wt). And the pH value of suspension was adjusted in a range from 4 to 5. After stabilization the mixture was ultrasonically treated for 3 h to form a stable suspension. Prior to the electrophoretic deposition, the titanium substrate was hydrothermally treated at 140 in NaOH (10 mol/L) solution for 6 h. A titanium sheet and circinal net of stainless steel were used as a cathode and an anode respectively, and a constant deposition voltage of 30 V was applied for 50-60 s in the EPD process. The thickness of the coatings was controlled from 10 microm to 20 microm. The samples of composite coating were then sintered in a resistance tube furnace in flowing argon at 700 for 2 h. The structure of the as prepared coating was characterized by SEM and XRD, and the bonding force of the coating/substrate was measured by an interfacial shear strength test. It is shown that the bonding strengths between the coating and the titanium substrate is as high as 35 MPa. The cell culture experiments indicate that the prepared composite coating of HA/MWNTs possesses good biocompatibility.
通过电泳沉积（EPD）制备了羟基磷灰石（HA）/多壁碳纳米管（MWNTs）复合涂层。将HA和MWNTs纳米粉末分散在乙醇中，总浓度为0.005 g/mL，MWNTs含量为20%和30%（重量）。将悬浮液的pH值调节在4至5的范围内。稳定后，将混合物超声处理3小时以形成稳定的悬浮液。在电泳沉积之前，将钛基底在140℃的NaOH（10 mol/L）溶液中进行水热处理6小时。分别使用钛片和不锈钢圆形网作为阴极和阳极，在EPD过程中施加30 V的恒定沉积电压50 - 60秒。涂层厚度控制在10微米至20微米之间。然后将复合涂层样品在流动氩气的电阻管式炉中于700℃烧结2小时。通过扫描电子显微镜（SEM）和X射线衍射（XRD）对制备的涂层结构进行表征，并通过界面剪切强度测试测量涂层/基底的结合力。结果表明，涂层与钛基底之间的结合强度高达35 MPa。细胞培养实验表明，制备的HA/MWNTs复合涂层具有良好的生物相容性。
