Formation mechanism of petal-like micropattern and nanofibers in porous anodic alumina. (June 2017)

• Record Type: Journal Article
• Authors: Fan, Haowen; Lin, Tong; Zhang, Weikang; Ma, Jing; Lu, Sitong; Zhu, Xufei
• Is Part Of: Materials research bulletin. Volume 90(2017)
• Page Start: 119
• Page End: 124
• Publication Date: 2017-06
• Subjects: A. Nanostructures -- A. Microporous materials -- A. Oxides -- A. Thin films -- D. Ionic conductivity; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2017.02.027
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: Highlights: PAA with petal-like micropattern was fabricated in oxalic acid electrolyte. Explanation for petal-like micropattern and nanofibers is proposed. Shear and corrosion effects of micro-flow contribute to petal-like micropattern. The self-ordering nanochannels of PAA are attributed to the oxide plastic flow. Abstract: Special nanostructures of porous anodic alumina (PAA), such as the petal-like micropattern and nanofibers of alumina, cannot be explained by the classical field-assisted dissolution and dynamic equilibrium models. Here, by combination of oxygen bubble mould and plastic flow model, a reasonable explanation for these special nanostructures is proposed. The petal-like micropatterns of PAA and nanofibers of alumina are all clarified by the oxygen bubble mould and the plastic flow model. The self-ordering nanochannels of PAA are attributed to the oxide plastic flow around a gas bubble mould at each pore bottom. The petal-like micropatterns and nanofibers of alumina are attributed to chemical corrosion enhanced by the micro-gas-flow and micro-liquid-flow.