Controllable preparation of a nano-hydroxyapatite coating on carbon fibers by electrochemical deposition and chemical treatment.
Controllable preparation of a nano-hydroxyapatite coating on carbon fibers by electrochemical deposition and chemical treatment.
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DOI：
10.1016/j.msec.2016.02.058
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发表时间：
2016-06
期刊：
影响因子：
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通讯作者：
Xudong Wang;Xueni Zhao;Wanying Wang;Jing Zhang;Li Zhang;Fuzhen He;Jianjun Yang
中科院分区：
文献类型：
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作者：
Xudong Wang;Xueni Zhao;Wanying Wang;Jing Zhang;Li Zhang;Fuzhen He;Jianjun Yang
在碳纤维表面直接制备了一层厚度合适、形貌与人体骨组织相似的纳米羟基磷灰石涂层。在制备过程中使用硝酸、盐酸、硫酸和过氧化氢（NHSH）的混合溶液。涂层采用NHSH处理和电化学沉积相结合的方法制备。NHSH处理操作简单，反应迅速，效果高。该方法首次用于诱导HA晶体在CF表面上的成核和生长。通过NHSH处理（NHSH-CFs），许多含O官能团，如羟基（-OH）和羧基（-COOH）基团被接枝到CF表面上;因此，与未处理的CF上的那些相比，这些基团在官能化CF上的量分别增加了近8倍和12倍。处理后的NHSH-CF不仅获得了更大的比表面积，而且保持了表面无严重腐蚀或破损。因此，NHSH-CF是电化学沉积HA涂层的理想基体。采用电化学方法成功地在NHSH-CF表面制备了纳米棒状HA涂层。通过调节电流密度、沉积时间和温度等工艺参数，可以有效地控制HA涂层的元素组成、结构和形貌。随着沉积时间的延长，HA晶体的平均中心直径和涂层密度增加。随着沉积时间从60 min增加到180 min，大多数HA晶体在NHSH-CF上的平均中心直径从60 nm变化到210 nm。对NHSH-CF沉积机理的进一步研究表明，NHSH-CF表面的许多含氧官能团可以与电解质离子（Ca ~（2+））结合形成特殊的化学键。这些键合可以诱导HA涂层沉积并提高HA涂层与NHCH-CF之间的界面结合强度。本研究的结果和提出的制备均匀致密的纳米HA涂层的方法为今后在医疗产品和植入物纤维材料上制备活性HA涂层提供了理论和实践指导。本工作也为HA涂层CFs/HA复合种植体的临床应用奠定了基础。
A nano-hydroxyapatite (HA) coating with appropriate thickness and morphology similar to that of human bone tissue was directly prepared onto the surfaces of carbon fibers (CFs). A mixed solution of nitric acid, hydrochloric acid, sulfuric acid, and hydrogen peroxide (NHSH) was used in the preparation process. The coating was fabricated by combining NHSH treatment and electrochemical deposition (ECD). NHSH treatment is easy to operate, produces rapid reaction, and highly effective. This method was first used to induce the nucleation and growth of HA crystals on the CF surfaces. Numerous O-containing functional groups, such as hydroxyl (–OH) and carboxyl (–COOH) groups, were grafted onto the CF surfaces by NHSH treatment (NHSH-CFs); as such, the amounts of these groups on the functionalized CFs increased by nearly 8- and 12-fold, respectively, compared with those on untreated CFs. After treatment, the NHSH-CFs not only acquired larger specific surface areas but retained surfaces free from serious corrosion or breakage. Hence, NHSH-CFs are ideal depositional substrates of HA coating during ECD. ECD was successfully used to prepare a nano-rod-like HA coating on the NHSH-CF surfaces. The elemental composition, structure, and morphology of the HA coating were effectively controlled by adjusting various technological parameters, such as the current density, deposition time, and temperature. The average central diameter of HA crystals and the coating density increased with increasing deposition time. The average central diameter of most HA crystals on the NHSH-CFs varied from approximately 60 nm to 210 nm as the deposition time increased from 60 min to 180 min. Further studies on a possible deposition mechanism revealed that numerous O-containing functional groups on the NHSH-CF surfaces could associate with electrolyte ions (Ca2 +) to form special chemical bonds. These bonds can induce HA coating deposition and improve the interfacial bonding strength between the HA coating and NHCH-CFs. The results of this study and the proposed preparation of uniform and dense nano-HA coating provide theoretical and practical guidance for future investigations of active HA coatings on fiber materials for medical products and implants. This work also lays the foundation for the wider use of HA-coated CFs/HA composite implants in clinical application.