Multi-Asymmetric
Ion-Diode Membranes with Superior
Selectivity and Zero Concentration Polarization Effect
Posted on 2019-09-09 - 14:04
Biological
ion channels exhibiting selective and rectified ion
transport properties feature nanoscale asymmetries in their physical
structure, chemical composition, and charge distribution. Inspired
by this, a multi-asymmetric ion-diode membrane (IDM) having a heterojunction
between a positively charged anodic aluminum oxide membrane with conical
macropores and a negatively charged Nafion membrane with very narrow
mesopores was designed and practically fabricated in this study. Experiments
and theoretical calculations demonstrated that the proposed membrane
has the highest selectivity among IDMs and provides complete suppression
of the concentration polarization (CP) effect limiting the current
density in ion-exchange membrane electrodialysis. These findings present
direct evidence that the physical and chemical design of the channel
structure can provide both superior selectivity and a zero CP effect
to IDMs and practical fabrication methods of IDMs for diverse, promising
membrane applications.
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Jung, Jaehoon; Kim, Jongyoung; Lee, Han Sup; Kang, Il-Suk; Choi, Kiwoon (2019). Multi-Asymmetric
Ion-Diode Membranes with Superior
Selectivity and Zero Concentration Polarization Effect. ACS Publications. Collection. https://doi.org/10.1021/acsnano.9b05570
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AUTHORS (5)
JJ
Jaehoon Jung
JK
Jongyoung Kim
HL
Han Sup Lee
IK
Il-Suk Kang
KC
Kiwoon Choi
KEYWORDS
chemical designanodic aluminum oxide membranechemical compositionIDMmembrane applicationsion channelsfabrication methodsCP effection transport properties feature nanoscale asymmetriesZero Concentration Polarization Effectcharge distributionSuperior Selectivitymulti-asymmetric ion-diode membraneMulti-Asymmetric Ion-Diode Membraneschannel structureNafion membraneion-exchange membrane electrodialysisconcentration polarizationconical macropores