| 电诱导牙釉质表面羟基磷灰石涂层形成的研究 |
| Preparation of Hydroxyapatite Coatings on Enamel by Electrochemical Technique |
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| 摘要: 以含Ca(NO3)2、NH4H2PO4和NaNO3组成的溶液作为电解液，在人牙釉质表面电诱导制备了羟基磷灰石(HA)涂层。应用X射线衍射(XRD)﹑扫描电镜(SEM)和能谱分析(EDS)对形成涂层后的牙釉质样品进行分析和表征，研究了电解液初始pH值﹑电流密度和温度的变化对涂层的组成﹑结构和形貌的影响。研究结果表明这些因素对涂层的组分(HA)没有显著影响，而对涂层中HA晶体c轴的择优取向度的影响则较显著。当控制电解液的初始pH值为6﹑电流密度为0.5 mA·cm-2﹑温度为55 ℃的时候，涂层中HA晶体沿c轴方向择优取向生长，且择优取向度和牙釉柱的HA较为接近。 |
| 关键词: 电化学 牙釉质 羟基磷灰石(HA) 涂层 |
| 基金项目: |
| Abstract: Hydroxyapatite(HA) coatings were successfully prepared on human enamel surfaces by electrochemical technique with the electrolyte of Ca(NO3)2, NH4H2PO4 and NaNO3. Their crystal structures were analyzed by X-ray powder diffraction (XRD). Also, their surface morphologies were investigated by scanning electron microscopy (SEM). In addition, the chemical composition of the coatings were analyzed by an energy dispersion spectroscopy (EDS) attached to SEM. The formation of the coating was studied with particular emphasis on the effects of the process parameters such as the initial pH values of the electrolyte, the current density, and the temperature. The results showed that the process parameters had no significant influence on the composition of the coatings, which was determined as HA. But the degree of preferential orientation of c-axis of HA was great influenced by them. The HA crystals preferentially grew along the c-axis when the initial pH was 6.00 at 55 ℃ with the current density of 0.5 mA·cm-2. And the degree of preferential orientation implied a similar value to the natural enamel crystals. |
| Keywords: electrochemical technique enamel hydroxyapatite(HA) coatings |
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| 廖颖敏,冯祖德,雷彩霞.电诱导牙釉质表面羟基磷灰石涂层形成的研究[J].无机化学学报,2009,25(7):1187-1193. |
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