论文标题

高分辨率中子成像:一种在阳极氧化铝中表征水的新方法

High-resolution neutron imaging: a new approach to characterize water in anodic aluminum oxides

论文作者

Ott, Noemie, Cancellieri, Claudia, Trtik, Pavel, Schmutz, Patrik

论文摘要

在阳极Al氧化物层的生长过程中,水掺入膜中,因此影响形成的氧化物的内在特性。在这项研究中,我们提出了一种基于高分辨率中子成像的使用,以可视化和量化多孔Al氧化物中的水含量作为阳极条件的函数。这些多孔膜中的水要么直接掺入氧化物结构(结构)和/或填充毛孔(形态学)中。这项初步研究表明,多孔阳极Al氧化物层的水含量差异与氧化物生长参数密切相关,但有趣的是,与无定形氧化物结构或孔形态的特定变化无法直接相关。由于高分辨率中子成像对水含量的微小变化的敏感性很高,因此我们还表明,在硫酸以及磷酸中形成的Al氧化物中的形态学水含量在热处理和浸泡时可部分逆转。还发现高分辨率中子成像对结构障碍和晶体学取向高度敏感,从而可以根据其结构和形态缺陷含量鉴定不同的晶体氧化物样品。这提供了新的观点,可以研究氢和/或水的掺入的影响以及与氧化物相关的结构修饰对Al oxihydroxide在与生长参数有关,稳定性,功能化以及性质调谐方面的影响,与表面保护高度相关及其用作模板。

During the growth of anodic Al oxide layers water incorporates in the film and therefore influences the intrinsic properties of the oxide formed. In this study, we propose a new approach, based on the use of high-resolution neutron imaging, to visualize and quantify the water content in porous Al oxides as a function of anodizing conditions. Water in these porous films is either incorporated directly in the oxide structure (structural) and/or fills the pores (morphological). This preliminary study demonstrates that the differences in water content of porous anodic Al oxide layers are strongly related to the oxide growth parameters but interestingly cannot be directly correlated to a specific change in the amorphous oxide structure or in the pore morphology. Due to the high sensitivity of high-resolution neutron imaging to small changes in the water content, we furthermore show that the morphological water content in Al oxides formed in sulfuric acid as well as in phosphoric acid is partially reversible upon heat treatment and immersion. High-resolution neutron imaging is also found to be highly sensitive to structural disorder and crystallographic orientations, allowing to identify different crystalline Al oxide samples based on their structural and morphological defect content. This offers new perspectives to study the effect of the hydrogen and/or water incorporation as well as oxide-related structural modifications on Al oxihydroxides in relation to growth parameters, stability, functionalization as well as properties tuning, highly relevant to surface protection and their use as templates.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源