多孔氧化铝模板的制备及应用

以磷酸溶液为电解液、以高纯铝为阳极,采用两步阳极氧化法制备氧化铝模板。扫描电子显微镜(SEM)对其表面形貌分析表明,氧化铝膜为多孔结构,膜孔径随着阳极氧化电压的增大而不断增大。对阳极氧化电流密度变化分析证实,铝的阳极氧化经历了三个阶段:阻挡层的生成、多孔层的形成和多孔层的稳定生长。以制备的氧化铝膜为阴极、锌片为阳极,以硝酸锌和硼酸的混合液为电解液,采用交流电沉积方法制备了针状氧化锌纳米线。     

硬质阳极氧化在弹上的应用

硬质阳极化已在机械及航空工业中逐渐推广应用,但在武器弹药方面应用甚少。本文简要阐述了硬质阳极化处理在反坦克超速脱壳穿甲弹和航空火箭弹上的应用及其对战术使用性能的影响。     

Au@TiO2纳米管阵列的制备及光催化性能

利用一种简单易行、可控的方法制备了均匀的Au@TiO₂纳米管阵列。首先在室温下通过阳极氧化的方法形成TiO₂纳米管,再在氧化后的TiO₂纳米管上用磁控溅射沉积不同厚度的Au膜,最后将沉积Au膜后的TiO₂纳米管在空气中450℃退火2h。热处理过程导致了Au向TiO₂纳米管的扩散,在纳米管表面形成了Au“岛”包裹的Au@TiO₂纳米管。对制备的Au@TiO₂纳米管的微观结构利用了扫描电子显微镜、能谱、X射线衍射和透射电子显微镜进行表征。并且用光电流、紫外可见光光漫反射光谱、荧光光谱和降解亚甲基蓝溶液的方法分析测量了Au@TiO₂纳米管的光电性能及光催化性能。结果表明：当可见光照射含Au@TiO₂纳米管催化剂的亚甲基蓝水溶液时,其光催化性能远远高于纯TiO₂纳米管,这是由于Au颗粒表面等离子体共振效应（LSPR）增加了电子-空穴对的分离并且延缓了其重组所致。     

铝阳极氧化基板制备过程对埋置型Ta-N薄膜电阻的影响

在铝阳极氧化多层基板内用RF反应溅射制备了埋置型Ta-N薄膜电阻,研究了铝阳极氧化过程对Ta-N薄膜电阻和显微结构的影响.实验结果表明:Ta-N薄膜受上层多孔氧化铝膜影响在表层形成了由Ta2O5和Ta-O-N组成的氧化物凸起绝缘层,氧化物凸起层厚度与氧化电压有关.底层Ta-N薄膜电阻率和电阻温度系数基本保持不变,表层氧化凸起使电阻稳定性增加.     

Corrosion resistance improvement of Ti-6Al-4V alloy by anodization in the presence of inhibitor ions

Colorful thin oxide films were synthesized by galvanostatic anodization on Ti-6Al-4V alloy. Three different aqueous solutions containing corrosion inorganic inhibitors (Na₂MoO₄, NaH₂PO₄ and NH₄VO₃) were employed for the anodization treatment. The effect of inhibitor anions on the corrosion behavior of the alloy in Ringer solution was studied. Open circuit potential (OCP), Tafel polarization, linear sweep voltammetry (LSV) and chronoamperometry (CA) were performed to evaluate the corrosion performance of the treated electrodes. The incorporation of the inhibitor ions was detected by the release of Mo, V and P through ICP-AES technique. The formed oxides were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that compact, amorphous oxides without pores or cracks were obtained independently of the solution used. The sample anodized in Na₂MoO₄ solution registered the lowest corrosion current density (0.11 μA/cm²), and it was able to protect the alloy even after 168 h of immersion in Ringer solution. No cracks or corrosion products were detected. The XPS analysis reveals the incorporation of molybdenum to the oxide film in the form of Mo⁶⁺ and Mo⁴⁺.     

The characteristic and osteogenic effect of a nanoporous coating of zirconia implant

Zirconia ceramics have become increasingly used as dental implant material which is mainly due to their “tooth-like” color, superior biocompatibility, and excellent mechanical properties. However, the bio-inertness of the zirconia surface limits its use for a wider range of clinical applications. To enhance the surface bioactivity, a combination of magnetron sputtering, and anodization has in the present study been used to deposit a homogeneous nano-porous coating (ZrNP) on the zirconia surface (forming ZrO₂/ZrNP with a ZrNP pore diameter of 20–30 nm, and a ZrNP layer thickness of ～2 μm). EDS and XRD analysis showed that the distribution of the surface chemical components, as well as the crystalline structure of the zirconia (ZrO₂), remained unchanged. On the other hand, the hydrophilicity of the ZrO₂/ZrNP surface became significantly improved (as compared with a control group). In addition, the bond strength of the coating was decreased as a result of the anodization treatment. Moreover, both the Zr and ZrNP nanolayers exhibited improved proliferation and osteogenic properties in the in vitro cell experiment. Also, the ZrNP nanolayer was found to promote the biocompatibility and osteogenic ability to the largest extent. The ZrNP nanolayer did also provide numerous adhesion sites for MC3T3-E1 whereby the cell morphology could be enhanced. Additionally, the nano porous ZrNP layer improved the new bone formation around the zirconia implant and did robustly enhance the push out bond strength, thereby indicating the best osteointegration ability. In conclusion, a nano porous zirconium layer has been found to be very promising for the improvement of the bioactivity of the zirconia implant material.     

Influence of electrolyte temperature on the synthesis of iron oxide nanostructures by electrochemical anodization for water splitting

Iron oxide nanostructures are an attractive option for being used as photocatalyst in photoelectrochemical applications such as water splitting for hydrogen production. Nanostructures can be obtained by different techniques, and electrochemical anodization is one of the simplest methods which allows high control of the obtained morphology by controlling its different operational parameters. In the present study, the influence of the electrolyte temperature during electrochemical anodization under stagnant and hydrodynamic conditions was evaluated. Temperature considerably affected the morphology of the obtained nanostructures and their photoelectrochemical behavior. Several techniques were used in order to characterize the obtained nanostructures, such as Field Emission Scanning Electron Microscopy (before and after the annealing treatment in order to evaluate the changes in morphology), Raman spectroscopy, photocurrent vs. potential measurements and Mott-Schottky analysis. Results revealed that the nanostructures synthesized at an electrolyte temperature of 25 °C and 1000 rpm are the most suitable for being used as photocatalysts for water splitting.     

Multidimensional Anodized Titanium Foam Photoelectrode for Efficient Utilization of Photons in Mesoscopic Solar Cells

Mesoscopic solar cells based on nanostructured oxide semiconductors are considered as a promising candidates to replace conventional photovoltaics employing costly materials. However, their overall performances are below the sufficient level required for practical usages. Herein, this study proposes an anodized Ti foam (ATF) with multidimensional and hierarchical architecture as a highly efficient photoelectrode for the generation of a large photocurrent. ATF photoelectrodes prepared by electrochemical anodization of freeze‐cast Ti foams have three favorable characteristics: (i) large surface area for enhanced light harvesting, (ii) 1D semiconductor structure for facilitated charge collection, and (iii) 3D highly conductive metallic current collector that enables exclusion of transparent conducting oxide substrate. Based on these advantages, when ATF is utilized in dye‐sensitized solar cells, short‐circuit photocurrent density up to 22.0 mA cm^?2 is achieved in the conventional N719 dye‐I₃^?/I^? redox electrolyte system even with an intrinsically inferior quasi‐solid electrolyte.     

Influence of Anodic Conditions on Self-ordered Growth of Highly Aligned Titanium Oxide Nanopores

Self-aligned nanoporous TiO₂ templates synthesized via dc current electrochemical anodization have been carefully analyzed. The influence of environmental temperature during the anodization, ranging from 2 °C to ambient, on the structure and morphology of the nanoporous oxide formation has been investigated, as well as that of the HF electrolyte chemical composition, its concentration and their mixtures with other acids employed for the anodization. Arrays of self-assembled titania nanopores with inner pores diameter ranging between 50 and 100 nm, wall thickness around 20–60 nm and 300 nm in length, are grown in amorphous phase, vertical to the Ti substrate, parallel aligned to each other and uniformly disordering distributed over all the sample surface. Additional remarks about the photoluminiscence properties of the titania nanoporous templates and the magnetic behavior of the Ni filled nanoporous semiconductor Ti oxide template are also included.     

钛合金粘接件表面技术研究

详细地说明了钛合金表面处理的原理，进行了钛合金粘接接头的阳极氧化表面处理方法的研究，与其他表面处理方法相比，本试验方法大大改善了钛合金粘接接头的性能，便于工艺实施。