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Formation of layered structure porous‐type anodic alumina films locally with a solution flow‐type micro‐droplet cell
Author(s) -
Sakairi Masatoshi,
Nishino Fumika,
Itzinger Regina
Publication year - 2016
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.5893
Subject(s) - anodizing , porosity , materials science , oxide , aluminium , layer (electronics) , chemical engineering , capillary action , anode , porous medium , composite material , metallurgy , chemistry , electrode , engineering
A solution flow‐type micro‐droplet cell with co‐axial dual capillary tubes (Sf‐MDC) was applied to form porous‐type anodic alumina film with layered structure at selected areas on aluminum. The anodizing process with different repetition numbers, yielding different oxide layer numbers, was performed with the Sf‐MDC. The investigation of cross sections of the formed oxide showed that the pore diameter widened at the boundary between layers. From a simulated anodizing process with the Sf‐MDC, the reason for this modification of the pores was suggested to be intermittent anodizing with processes of drying up of the solution of the pores and widening at the bottom of the pores. Copyright © 2015 John Wiley & Sons, Ltd.