Open AccessModulation of ionic current rectification direction for biomimetic aluminum oxide membrane by surface modification
Author(s) -
Jaehoon Jung,
Jongyoung Kim,
Joonho Lee,
YeonWha Oh,
Sanghee Jung,
IlSuk Kang,
Kiwoon Choi
Publication year - 2022
Publication title -
aip advances
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.421
H-Index - 58
ISSN - 2158-3226
DOI - 10.1063/5.0080254
Subject(s) - rectification , membrane , ionic bonding , anodizing , materials science , surface modification , ion , modulation (music) , oxide , chemistry , analytical chemistry (journal) , aluminium , chemical engineering , voltage , chromatography , composite material , organic chemistry , physics , biochemistry , quantum mechanics , engineering , metallurgy , acoustics
A biomimetic aluminum oxide membrane having asymmetric channels with a minimum diameter of 20 nm, a maximum diameter of 80 nm, and a length of 5 µm was prepared using square pulse anodization. The membrane effectively permitted transfer of anions only and showed an ionic current rectification characteristic with a rectification ratio of 2.4. After the sulfonic acid group was introduced by surface modification, the membrane effectively permitted transfer of cations only and showed a rectification ratio of 2.7. This modulation of the ionic current rectification direction was consistent with the theoretical prediction through the numerical analysis of 2D models. These findings present a convenient method to control ion transport for the ion exchange membrane.
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom