Institute of Biomaterials, Department of Materials Science and Engineering, University of Erlangen-Nuremberg, Erlangen, Germany.
J Colloid Interface Sci. 2012 Jun 1;375(1):102-5. doi: 10.1016/j.jcis.2012.02.054. Epub 2012 Mar 3.
TiO(2)-nanostructured coatings from aqueous suspensions have been successfully prepared by the application of alternating current (AC) instead of direct current (DC) during electrophoretic deposition (EPD). No organic additives in suspension were required for successful EPD. The quality of the AC-EPD TiO(2) coatings in terms of homogeneity and extent of microcracking, upon drying, observed by SEM, was superior to that of DC-EPD coatings made from the same type of suspensions. The main difference between AC- and DC-EPD was the suppression of bubble formation. The absence of water electrolysis at the electrodes can be explained by the particular distribution of the electric field during AC mode, which prevents the nucleation of bubbles. The preparation of TiO(2) coatings from aqueous suspension and without the aid of organic stabilizers opens the possibility for co-deposition of sensitive materials such as biomolecules and even cells for biomedical applications, given the high biocompatibility of TiO(2). The deposition of TiO(2) coatings from aqueous suspensions is also attractive from environmental and economical points of view.
通过在电泳沉积（EPD）过程中应用交流（AC）而不是直流（DC），已经成功地从水性悬浮液中制备了 TiO(2)-纳米结构涂层。悬浮液中不需要有机添加剂即可成功进行 EPD。通过 SEM 观察到，在干燥过程中，AC-EPD TiO(2)涂层在均匀性和微裂纹程度方面的质量优于由相同类型悬浮液制成的 DC-EPD 涂层。AC-EPD 和 DC-EPD 的主要区别在于抑制了气泡的形成。在电极处没有发生水的电解，可以通过交流模式下电场的特殊分布来解释，这防止了气泡的成核。在没有有机稳定剂的帮助下，从水性悬浮液中制备 TiO(2)涂层为共同沉积敏感材料（如生物分子甚至细胞）提供了可能性，这是因为 TiO(2)具有很高的生物相容性。从环境和经济的角度来看，从水性悬浮液中沉积 TiO(2)涂层也具有吸引力。
