Chitosan/gelatin-based bioactive and antibacterial coatings deposited via electrophoretic deposition

The fabrication of biocompatible and antibacterial coatings on metallic implants remains a significant challenge for load-bearing orthopedic implants. This study focuses on the electrophoretic deposition of chitosan/gelatin/Ag-Mn doped mesoporous bioactive glass nanoparticles (Ag-Mn MBGNs) composite on the PEEK/bioactive glass layer (called as multi-structured coatings), which had been deposited electrophoretically on 316L stainless steel. The EPD parameters for the deposition of the chitosan/gelatin/Ag-Mn MBGNs coatings were optimized via Taguchi design of experiment approach. Scanning electron microscopy images confirmed that the chitosan/gelatin/Ag-Mn MBGNS layer was deposited on the PEEK/BG layer. The addition of biologically active metallic ions (Mn and Ag) and molecules (chitosan) showed a strong effect on the growth of bacteria. Moreover, the inclusion of Mn and Ag showed a negligible toxic effect on the bioactivity (the ability of the coating to form a bond with the natural bone) of the coatings. Furthermore, the multi-structured coatings presented appropriate wettability and surface roughness for orthopedic applications. Overall, this study provides a direct solution to improve the bioactivity, antibacterial activity, and surface properties of deposited chitosan/gelatin coatings on orthopedic implants that are more manufacturable and translational from research to an industrial scale.     

Effect of Dispersants on the Electrophoretic Deposition of Hydroxyapatite‐Carbon Nanotubes Nanocomposite Coatings

Isopropanolic Suspensions of HA nanoparticles (20 g/L) plus various concentrations of carbon nanotubes (CNTs) were prepared using Tris and triethanolamine as dispersant. The positively charged HA nanoparticles were heterocoagulated on the negatively charged CNTs and generated the HA‐CNT composite particles with net positive surface charge. The heterocoagulation was more intensive in dispersant‐containing suspensions (DCS) due to the higher zeta potential of HA nanoparticles in them. HA‐CNTs particles can be rotated and aligned parallel to electric field as a result of torque exerted on them due to the generation of a dipole moment in CNTs during electrophoretic deposition (EPD). The mobility of HA‐CNTs particles aligned parallel to electric field is ≈50% higher than that of HA nanoparticles leading to the faster EPD from DCS when CNTs are added into them. CNTs more efficiently reinforced the coatings deposited from DCS due to the stronger electrostatic bonding between CNTs and HA nanoparticles in them.     

抗菌乳胶涂料

介绍以纳米氧化锌为抗菌成分的抗菌乳胶涂料用原材料助剂,依据相关标准,通过对该涂料性能检测,产品具有优良的抗效果及综合性能.     

新型抗菌内墙涂料的制备及性能研究

研究了新型抗菌内墙涂料的配方设计,通过添加Zn2+或壳聚糖来制备抗菌内墙涂料,结果显示:随着内墙涂料中Zn2+或壳聚糖浓度的增大,这2种涂料对大肠杆菌的抑菌效果越好。采用Zn2+作为抗菌剂,制成抗菌内墙苯丙乳胶漆,其理化综合性能优异。     

我国铝型材电泳涂料的发展现状

简述了铝型材电泳涂料的发展过程，对目前国内产品与国外产品之间进行了比较，指出了我国铝型材电泳涂的发展方向和尚需解决的问题。     

抗菌涂料中无机抗菌剂的研究进展

简单介绍了无机抗菌剂的概念、分类及其特性,论述了无机抗菌剂的抗菌机理及研究进展,并对无机抗菌剂存在的问题进行了讨论。     

电泳沉积磷灰石生物陶瓷涂层的研究进展

羟基磷灰石(HA)生物涂层材料是最有发展前途的生物硬组织替代材料之一.电泳沉积具有装置简单,操作方便,非线性,沉积温度低等特点,可以解决传统HA生物陶瓷涂层制备工艺上的各种不足.文中探讨了电泳沉积的各种工艺影响因素,综合介绍了国内外有关电泳沉积HA复合(梯度)生物涂层和电泳沉积与其它方法复合制备HA生物涂层的研究报道,进而提出了相应的设想和展望.     

阴极电泳涂装工艺管理入门提要

探讨了阴极电泳涂装工艺管理人员应具备的条件及其职责、工作方法和学习方法。     

电泳沉积原理及其在陶瓷制备中的应用

本文介绍了电泳沉积(EPD)的原理,从胶体悬浮体系的DLVO经典静电稳定理论出发讨论了EPD的机理,综述了国外关于电泳沉积应用于陶瓷(包括传统瓷、技术瓷、超导瓷、生物瓷和复合瓷)坯体直接成型的研究进展。     

电泳涂料用异氰酸酯固化剂的封闭剂

从电泳涂料用异氰酸酯固化剂的封闭和解封闭机理入手,介绍了各类封闭剂的特点以及对电泳涂料涂膜固化条件、性能等方面的影响,提出了电泳涂料用异氰酸酯固化剂的封闭剂的未来发展建议。     

Electrophoretic Deposition Behavior of Aqueous Nanosized Zinc Oxide Suspensions

The rheological behavior and electrophoretic deposition (EPD) of ZnO nanopowder (nano-ZnO) in aqueous media have been described. A cationic polyelectrolyte (polyethylenimine, PEI) was used to disperse and modify the surfaces of the ZnO nanoparticles. The rheological properties of the ZnO aqueous suspension were investigated by measuring the viscosity versus the pH and amount of dispersant. The EPD processing was conducted via cathodic electrodeposition, using stable suspensions with low viscosity, and the depositional behavior was investigated. Bubble-free nano-ZnO deposits with uniform microstructures were successfully obtained, which was an indication of good sintering behavior.     

工艺因素对水热电泳沉积硅酸钇涂层显微结构的影响

采用水热电泳沉积法在C/C-SiC复合材料表面制备了硅酸钇抗氧化外涂层.研究了沉积电流密度和低温热处理对硅酸钇涂层的影响.采用X-射线衍射仪(XRD)和扫描电子显微镜(SEM)对涂层的相组成和显微结构进行了表征.结果表明:采用声化学法制备的硅酸钇微晶颗粒尺寸为25～40nm.随着沉积电流密度增加,硅酸钇涂层均匀性、致密性先逐渐增加后降低.当电流密度超过0.04 A/cm2时会导致涂层表面开裂.进行低温热处理,涂层表面硅酸钇纳米晶出现熔融现象;随热处理温度增加,涂层表面呈现玻璃化趋势.当热处理温度达1200℃时,表面完全熔融,形成致密的硅酸钇玻璃层.涂层在1500℃静态空气中,经过氧化10 h后,失重仍然小于2%.     

应用电泳沉积技术制备钛酸钡铁电陶瓷薄膜

采用电泳沉积技术在Pt电极基片上制备BaTiO3铁电陶瓷薄膜，探讨了电泳沉积过程中的控制因素（悬浮液体系，电场强度，料浆浓度，沉积时间等）对成膜性能的影响，并对薄膜材料的结构，性能进行了表征，实验结果表明；在1050℃（2h)的烧成温度下，经重复沉积一烧结2-3次可得到基本无缺陷的BaTiO3陶瓷薄膜，测量频率在1kHz，测量频率在1kHz时，室温（23℃）下的介电常数ε=2300，介电损耗tanδ=0.2。     

Thermodynamic Analysis of Chemical Vapor Deposition of BN + AIN Composite Coatings

Thermodynamic calculations were performed using a modified solgasmix-pv computer program in order to study the feasibility of codepositing boron nitride (BN) plus aluminum nitride (AIN) by chemical vapor deposition. Reactants considered were AICl₃, BCl₃ or B₂H₆, NH₃, and H₂. Deposition diagrams were generated for the BCl₃-AICl₃-NH₃ system over a range of processing conditions such as temperature, total system pressure, and reagent concentrations. Codeposition of BN + AIN was predicted by the calculations for temperatures in the range of 900 to 1700 K and pressures of 10.13 to 101.3 kPa. The predicted deposition efficiency at equilibrium was much higher for BN than for AlN at most reagent compositions. The AlN deposition efficiency increased with decreasing temperature and decreasing BCl₃ content, with increasing NH₃ content, or with the addition of H₂. Aluminum chlorides were found to be the dominant gaseous species.     

丙烯酸阳极电泳涂料的电泳涂装工艺研究

针对铝型材丙烯酸阳极电泳涂料,探讨了槽液固体含量、电泳电压、电泳时间、槽液pH等因素对漆膜外观和厚度的影响,确定了电泳涂装的最佳工艺参数:固体分5%～6%,电压120 V,电泳时间80～100 s,电泳槽液pH 7.6～8.1。     

电泳沉积用羟基磷灰石稳定悬浮液的制备

研究了羟基磷灰石粉体粒径、粉体预烧温度、陈化时间、分散溶剂、悬浮液固含量对羟基磷灰石悬浮液稳定性的影响,通过测定Zeta电位,吸光度等参数表征悬浮液稳定性,对悬浮液电泳沉积的涂层进行SEM表面形貌及粘结-拉伸结合强度的表征.结果表明:悬浮液颗粒越小,Zeta电位越高;对羟基磷灰石粉体预烧800℃,Zeta电位明显提高,且有利于涂层与基体的结合;悬浮液陈化48 h后,颗粒荷电性最佳,可得致密均匀的涂层;以乙二醇为分散溶剂可制备稳定的悬浮液,但乙醇溶剂更有利于涂层的电泳沉积;悬浮液固含量控制为20g/L时,涂层质量较好.     

阴极电泳涂料的研究现状及发展趋势

介绍了阴极电泳涂料的特点和当前的研究现状,指出了阴极电泳涂料今后的发展趋势。     

银系抗菌剂在内墙抗菌涂料中的性能研究

通过添加纳米银溶胶、玻璃载银、磷酸锆载银3种抗菌剂制得抗菌内墙涂料。用贴膜法和抑菌圈法测试了涂料的长效抗菌性;用扫描电镜测试了抗菌涂料与细菌的作用状态,并测试了抗菌涂料的色差变化。结果表明:扫描电镜下能很好地观察到涂膜与细菌的作用状态与形貌;自制玻璃载银抗菌涂料的色差变化最小;加入0.6%载银抗菌剂的内墙涂料初始抗菌率达到99%以上,但放置3个月后,抗菌率有所下降。     

抗菌涂料的研究现状及发展趋势

介绍了抗菌涂料的发展现状,对添加型抗菌涂料中应用的各种抗菌剂进行了综述,讨论了不同抗菌剂在抗菌涂料应用中的优劣;同时对结构性抗菌涂料的研究现状进行了简述,指出结构性抗菌涂料的发展将是未来抗菌涂料开发研究的重点。     

电沉积法制备磷酸钙生物活性陶瓷涂层

综述了用电沉积法在金属生物材料表面涂敷磷酸钙生物活性陶瓷的工艺,分析了电沉积工艺的特点,并介绍了制备金属－羟基磷灰石复合涂层的复合电沉积工艺。