Raddaha Namir S, Cordero-Arias Luis, Cabanas-Polo Sandra, Virtanen Sannakaisa, Roether Judith A, Boccaccini Aldo R
Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Cauerstrasse 6, 91058 Erlangen, Germany.
Institute of Surface Science and Corrosion, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Martensstrasse 7, 91058 Erlangen, Germany.
Materials (Basel). 2014 Mar 4;7(3):1814-1829. doi: 10.3390/ma7031814.
This article presents the results of an experimental investigation designed to deposit chitosan/hexagonal boron nitride (h-BN) and chitosan/h-BN/titania (TiO₂) composites on SS316L substrates using electrophoretic deposition (EPD) for potential antibacterial applications. The influence of EPD parameters (voltage and deposition time) and relative concentrations of chitosan, h-BN and TiO₂ in suspension on deposition yield was studied. The composition and structure of deposited coatings were investigated by FTIR, XRD and SEM. It was observed that h-BN and TiO₂ particles were dispersed in the chitosan matrix through simultaneous deposition. The adhesion between the electrophoretic coatings and the stainless steel substrates was tested by using tape test technique, and the results showed that the adhesion strength corresponded to 3B and 4B classes. Corrosion resistance was evaluated by electrochemical polarization curves, indicating enhanced corrosion resistance of the chitosan/h-BN/TiO₂ and chitosan/h-BN coatings compared to the bare stainless steel substrate. In order to investigate the inorganic bioactivity, coatings were immersed in simulated body fluid (SBF) for 28 days. FTIR and XRD results showed no formation of hydroxyapatite on the surface of chitosan/h-BN/TiO₂ and chitosan/h-BN coatings, which are therefore non bioactive but potentially useful as antibacterial coatings.
本文介绍了一项实验研究的结果，该研究旨在通过电泳沉积（EPD）将壳聚糖/六方氮化硼（h-BN）和壳聚糖/h-BN/二氧化钛（TiO₂）复合材料沉积在SS316L基底上，用于潜在的抗菌应用。研究了EPD参数（电压和沉积时间）以及壳聚糖、h-BN和TiO₂在悬浮液中的相对浓度对沉积产率的影响。通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）对沉积涂层的组成和结构进行了研究。观察到h-BN和TiO₂颗粒通过同时沉积分散在壳聚糖基质中。采用胶带试验技术测试了电泳涂层与不锈钢基底之间的附着力，结果表明附着力强度对应于3B和4B级。通过电化学极化曲线评估了耐腐蚀性，结果表明与裸露的不锈钢基底相比，壳聚糖/h-BN/TiO₂和壳聚糖/h-BN涂层的耐腐蚀性增强。为了研究无机生物活性，将涂层浸泡在模拟体液（SBF）中28天。FTIR和XRD结果表明，壳聚糖/h-BN/TiO₂和壳聚糖/h-BN涂层表面未形成羟基磷灰石，因此它们没有生物活性，但可能用作抗菌涂层。
