Preparation of Ordered Porous Alumina Through-Hole Membranes with Large Hole Periods by Two-Layer Anodization

Author:

Yanagishita TakashiORCID,Ozaki Mami,Kawato Ryotaro,Kato Atsushi,Kondo Toshiaki,Masuda Hideki

Abstract

Ordered anodic porous alumina through-hole membranes with a hole period larger than 500 nm were fabricated by two-layer anodization. Formation of the ordered anodic porous alumina with a hole period larger than 500 nm was carried out by anodization of Al in phosphoric acid or mixture of malic acid and phosphoric acid. Two-layered structures comprising porous alumina layers with different solubilities were formed by anodization using two electrolytes, one of which was 17.6 M sulfuric acid. The membranes were prepared by selectively etching the lower part of the alumina layer formed in 17.6 M sulfuric acid. The thickness of the membranes was controlled by adjusting the anodization time. The obtained membranes are expected to be used in various applications such as filtration membranes.

Funder

JSPS KAKENHI

Publisher

The Electrochemical Society

Subject

Materials Chemistry,Electrochemistry,Surfaces, Coatings and Films,Condensed Matter Physics,Renewable Energy, Sustainability and the Environment,Electronic, Optical and Magnetic Materials

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