HA/CuO/SrCO3梯度复合涂层的制备及体外生物活性

在羟基磷灰石(HA)悬浮液中, 以正丁醇为分散介质, 三乙醇胺为乳化剂, 成骨微量元素化合物CuO 和SrCO₃作为添加剂, Ti片为基材, 壳聚糖(CS)为造孔剂, 依次通过区带电泳分布并在反向电场作用下电 泳沉积, 得到HA/CS/CuO/SrCO₃复合涂层, 经700 ℃高温煅烧2 h后, 制得HA/CuO/SrCO₃复合涂层. 通过X射线衍射(XRD)、 傅里叶变换红外光谱(FTIR)、 场发射扫描电子显微镜(FESEM)、 能量色散光谱仪(EDS)、 劳埃德万能材料试验机、 电化学工作站、 模拟体液培养和抑菌实验等手段对复合涂层进行测试与表征. 结果表明, Ca, Cu和Sr 元素含量在HA/CuO/SrCO₃复合涂层的径向上均呈现梯度分布; 复合涂层与钛基材的结合强度达33.0 MPa; 循环伏安(CV)曲线和Tafel极化曲线测试表明, 复合涂层在N-2-羟乙基哌嗪-N′-2-乙磺酸(HEPES)模拟体液(H-SBF)中电化学性能稳定, 耐腐蚀性较强; 在H-SBF中培养24 d后, 复合涂层表面完全碳磷灰石化; 抑菌实验发现, 复合涂层粉末对大肠杆菌和金黄色葡萄球菌的抑菌率分别为81.82%和71.86%.     

两步法电沉积制备HA/Ag复合涂层

羟基磷灰石;银;两步法电沉积制备HA/Ag复合涂层     

电沉积HA/TiO2复合涂层的结合强度和热稳定性研究

HA/TiO₂ composite coating were fabricated via adding TiO₂ powder in the electrolyte by electrodeposition. The influence of current density and deposition time on the content of TiO₂ in the coating, the influence of the content of TiO₂ in the coating on the bonding strength of coating and the influence of sintering temperature on the structure and the bonding strength of coating were investigated. The experiment results show that the content of TiO₂ in the coating increase with reducing the current density and prolonging the deposition time, the bonding strength improve with increasing the content of TiO₂ in the coating, which can obtain 18.7 MPa when the weight percent TiO₂ in the coating attain 72.2 %. The addition of TiO₂ in the coating reduces the thermal expansion coefficient of the coating, improves the bonding strength of coating and changes the fracture mechanism of the coating from adhesion failure to cohesive failure. HA in the composite coatings is decomposed by the catalysis reaction of TiO₂ at the temperature of sinter 850 ℃. Differential scanning calorimetry and X-ray diffractometry analyses showed that the chemical reaction between HA and TiO₂ lead to the product are α-TCP and CaTiO₃ at the temperature of sinter 1200 ℃. In order to prevent the coating from decomposing and attain hign bonding strength, the sintering temperature should be less than 820 ℃.     

羟基磷灰石/氧化铁复合涂层的制备及其诱导骨生长的生物活性

用电泳沉积法制得羟基磷灰石/壳聚糖/氧化铁(HA/CS/Fe2O3)复合涂层,经700 ℃烧结处理得到HA/Fe2O3复合涂层。 通过SEM、EDS、XRD、FT-IR、电化学和万能材料试验机等对复合涂层的表面形貌、物相组成、抗腐蚀性和结合强度进行了表征和测试,最后采用1.5SBF浸泡法对复合涂层的生物活性进行了评价。 结果表明,当悬浮液中的HA、CS与Fe2O3质量比为100∶100∶1时,所制得的HA/Fe2O3复合涂层表面粗糙,抗腐蚀性强,具有良好的诱导骨生长生物活性,基体与复合涂层结合强度可达27.5 MPa。     

HA/ZnO/SiO2梯度涂层材料的制备及其体外抗菌活性测试

采用区带电泳法电泳羟基磷灰石（HA）、壳聚糖（CS）、ZnO和SiO₂悬浊液,接着施予反向电场进行电泳沉积从而在钛基材表面获得HA/CS/ZnO/SiO₂复合涂层材料,而后经710℃焙烧2 h后得到HA/ZnO/SiO₂涂层材料（Z1）。同时也仅用电泳沉积法直接制得HA/ZnO/SiO₂涂层材料（E1）作为对比。X射线能谱分析发现Si和Zn两种元素在Z1的径向上均呈现梯度分布,初步说明Z1具有一定的梯度。结合扫描电子显微镜、粉末X射线衍射、傅里叶红外光谱等手段对2种材料进行表征,发现Z1的各种性能较E1更为优异,主要表现在Z1与钛基材表面的结合强度达31.2 MPa,且在HEPES模拟体液中培养14 d后Z1表面碳磷灰石化程度更加完全。另外,抑菌实验发现Z1粉末对大肠杆菌和金黄色葡萄球菌的抑菌率分别为81.7%和89.4%。     

ZnO/TiO2复合涂层电极的制备及其光电性能

以氧化铟锡导电玻璃为基材,采用电泳沉积法制备负载型ZnO/TiO2复合涂层,经450℃后续烧结处理后,采用XRD、SEM、EDX和UV-Vis DRS对ZnO/TiO2复合涂层进行表征;在pH=7.00的磷酸盐缓冲溶液中,分别测试ZnO/TiO2复合涂层电极在紫外灯和100 W白炽灯辐照下的电化学阻抗谱、Tafel极化曲线和循环伏安等电化学性质。结果表明:ZnO以200~300 nm晶粒分散于复合涂层中,质量百分比为0.74%;ZnO/TiO2复合涂层在可见光区有一定的吸收;在可见光辐照下ZnO/TiO2复合涂层电极具有较好的光电活性,并对水的分解具有较强的光电催化活性。     

造孔剂对电泳沉积制备多孔HA涂层及其生物活性的影响

采用水热法制得的羟基磷灰石(HA)纳米粉体,分别与造孔剂葡萄糖(Glu)、壳聚糖(CS)、炭粉(C)3种微粒(＜38.5 μm)配置成质量比1∶1的悬浮液,电泳沉积 烧结制备钛基多孔HA涂层,并对制得的3种多孔HA涂层在模拟体液浸泡前后的表面形貌、化学组成及物相变化进行表征。 结果表明,经700 ℃烧结处理后制得的3种多孔HA涂层在1.5倍人体模拟体液中浸泡5 d后,多孔HA涂层表面均被层状生长的碳磷灰石颗粒完全覆盖,颗粒直径在5~25 μm,说明这些多孔HA涂层均具有良好的生物活性。 其中以CS为造孔剂制得的多孔HA涂层结合强度最高,达19.5 MPa,有望开发成为新型的人骨植入生物陶瓷材料。     

电沉积羟基磷灰石/TiO2复合涂层

结合强度;电沉积羟基磷灰石/TiO2复合涂层     

羟基磷灰石/氧化锆复合涂层的水热电沉积及其性能

羟基磷灰石/氧化锆复合涂层的水热电沉积及其性能;水热电沉积;羟基磷灰石;ZrO2;结合强度;生物活性     

脉冲电沉积制备HA/ZrO2纳米复合涂层的稳定性及生物相容性评价

采用脉冲电化学沉积法成功地在生物医用钛金属表面制备出均匀的纳米HA/ZrO₂复合涂层. 通过热处理提高涂层的致密性, 同时保留涂层的微纳结构. 考察了热处理后复合涂层的成分、形貌、生物相容性及生理稳定性. X射线衍射分析表明, 复合涂层成分为HA和ZrO₂. 扫描电镜观察发现, 热处理后复合涂层的致密性有所提高. 研究发现, ZrO₂的加入大大降低了HA/ZrO₂复合涂层中钙离子的释放速度, 提高了HA/ZrO₂复合涂层的生理稳定性. 纳米划痕实验结果表明, HA/ZrO₂复合涂层具有较好的结合强度. 通过培养成骨细胞考察了复合涂层的生物相容性. Alamar Blue检测表明, HA/ZrO₂复合涂层表面细胞黏附及增殖能力较好. ALP检测发现, 热处理后HA/ZrO₂复合涂层表面的细胞分化能力较强. 综合细胞培养结果显示, HA/ZrO₂复合涂层有较好的生物相容性.     

电沉积PAMAM/羟基磷灰石复合涂层的研究

电沉积PAMAM/羟基磷灰石复合涂层的研究;羟基磷灰石;聚酰胺胺树枝形聚合物;双电位阶跃技术;电沉积;生物活性     

Fabrication and In vitro Bioactivity of Robust Hydroxyapatite Coating on Porous Titanium Implant

Compared witli the traditional dental implant, TixOs■ manufactured by direct laser metal forming(DLMF) technology exhibits improved capability for bone osteointegration due to its porous surface structure, and has achieved remarkable clinical effect. However, like the traditional titanium and other alloyed implants, the porous titanium implant TixOsR also has relatively weak bioactivity. To address this issue, a proper surface modification method may be needed. Hydroxyapatite(HA) has been widely used in implant surface coating for its similar chemical composition to bone tissue and its osteoconductive properties. Thus, combining TixOs■ implants with hydroxyapatite can be an efficient way to enhance their bioactivity. We herewith reported a competent pulsed laser deposition(PLD) method of coating nano-sized HA thin film onto the porous TixOs■ implant. The HA coatings were characterized by means of scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDS), X-ray photoelectron spectroscopy(XPS) and focused ion beam(FIB) method, and nanocrystal sized thin HA films were identified on the surface of TixOs■ implants. The low cytotoxicity and improved cell proliferation ability of HA coated implants were further tested and verified using MC 3T3 E1 cells with the consideration of the controlling group. Our results show that a stable and bioactive HA tliin film is able to form on the surtace of the porous titanium implant by PLD method.This may benefit the fiirther clinical application of TixOs■ implants.     

电泳沉积制备ZnO-C60和ZnO-MWCNT合涂层电极及其光电性质

在氧化铟锡( ITO)导电玻璃表面电泳沉积制备ZnO-C60和ZnO-MWCNT复合涂层电极,经后续热处理增强其结合强度,通过SEM观察2种电极复合涂层的表面形貌,并使用CHI 705电化学分析仪和PMI-E电致化学发光系统测定其光电性质.结果表明,ZnO-C60复合涂层电极具有较高的稳定性,在可见光辐照下,该电极显示...