pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity

Yuanyang Rong; Qilei Song; Klaus Mathwig; Elena Madrid; Daping He; Ralf G. Niemann; Petra J. Cameron; Sara E C Dale; Simon Bending; Mariolino Carta; Richard Malpass-Evans; Neil B. McKeown; Frank Marken

doi:10.1016/j.elecom.2016.05.019

pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity

Yuanyang Rong, Qilei Song, Klaus Mathwig, Elena Madrid, Daping He, Ralf G. Niemann, Petra J. Cameron, Sara E C Dale, Simon Bending, Mariolino Carta, Richard Malpass-Evans, Neil B. McKeown, Frank Marken

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Abstract

"Ionic diode" (or current rectification) effects are potentially important for a range of applications including water purification. In this preliminary report, we observe novel ionic diode behaviour of thin (300 nm) membranes based on a polymer of intrinsic microporosity (PIM-EA-TB) supported on a poly-ethylene-terephthalate (PET) film with a 20 μm diameter microhole, and immersed in aqueous electrolyte media. Current rectification effects are observed for half-cells with the same electrolyte solution on both sides of the membrane for cases where cation and anion mobility differ (HCl, other acids, NaOH, etc.) but not for cases where cation and anion mobility are more alike (LiCl, NaCl, KCl, etc.). A pH-dependent reversal of the ionic diode effect is observed and discussed in terms of tentatively assigned mechanisms based on both (i) ion mobility within the PIM-EA-TB nano-membrane and (ii) a possible "mechanical valve effect" linked to membrane potential and electrokinetic movement of the membrane as well as hydrostatic pressure effects.

Original language	English
Pages (from-to)	41-45
Number of pages	5
Journal	Electrochemistry Communications
Volume	69
Early online date	27 May 2016
DOIs	https://doi.org/10.1016/j.elecom.2016.05.019
Publication status	Published - 1 Aug 2016

Keywords

Electrokinetic effects
Electrophysiology
Iontronics
Membrane potential
Nanofluidics
Salt separation

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10.1016/j.elecom.2016.05.019

PIM_Film_1ffff_EC_revision_nhAccepted author manuscript, 944 KBLicence: CC BY-NC-ND

http://dx.doi.org/10.1016/j.elecom.2016.05.019

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Rong, Y., Song, Q., Mathwig, K., Madrid, E., He, D., Niemann, R. G., Cameron, P. J., Dale, S. E. C., Bending, S., Carta, M., Malpass-Evans, R., McKeown, N. B., & Marken, F. (2016). pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity. Electrochemistry Communications, 69, 41-45. https://doi.org/10.1016/j.elecom.2016.05.019

Rong, Y, Song, Q, Mathwig, K, Madrid, E, He, D, Niemann, RG, Cameron, PJ , Dale, SEC , Bending, S, Carta, M, Malpass-Evans, R, McKeown, NB & Marken, F 2016, 'pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity', Electrochemistry Communications, vol. 69, pp. 41-45. https://doi.org/10.1016/j.elecom.2016.05.019

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title = "pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity",

abstract = "{"}Ionic diode{"} (or current rectification) effects are potentially important for a range of applications including water purification. In this preliminary report, we observe novel ionic diode behaviour of thin (300 nm) membranes based on a polymer of intrinsic microporosity (PIM-EA-TB) supported on a poly-ethylene-terephthalate (PET) film with a 20 μm diameter microhole, and immersed in aqueous electrolyte media. Current rectification effects are observed for half-cells with the same electrolyte solution on both sides of the membrane for cases where cation and anion mobility differ (HCl, other acids, NaOH, etc.) but not for cases where cation and anion mobility are more alike (LiCl, NaCl, KCl, etc.). A pH-dependent reversal of the ionic diode effect is observed and discussed in terms of tentatively assigned mechanisms based on both (i) ion mobility within the PIM-EA-TB nano-membrane and (ii) a possible {"}mechanical valve effect{"} linked to membrane potential and electrokinetic movement of the membrane as well as hydrostatic pressure effects.",

keywords = "Electrokinetic effects, Electrophysiology, Iontronics, Membrane potential, Nanofluidics, Salt separation",

author = "Yuanyang Rong and Qilei Song and Klaus Mathwig and Elena Madrid and Daping He and Niemann, {Ralf G.} and Cameron, {Petra J.} and Dale, {Sara E C} and Simon Bending and Mariolino Carta and Richard Malpass-Evans and McKeown, {Neil B.} and Frank Marken",

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doi = "10.1016/j.elecom.2016.05.019",

language = "English",

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T1 - pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity

AU - Rong, Yuanyang

AU - Song, Qilei

AU - Mathwig, Klaus

AU - Madrid, Elena

AU - He, Daping

AU - Niemann, Ralf G.

AU - Cameron, Petra J.

AU - Dale, Sara E C

AU - Bending, Simon

AU - Carta, Mariolino

AU - Malpass-Evans, Richard

AU - McKeown, Neil B.

AU - Marken, Frank

PY - 2016/8/1

Y1 - 2016/8/1

N2 - "Ionic diode" (or current rectification) effects are potentially important for a range of applications including water purification. In this preliminary report, we observe novel ionic diode behaviour of thin (300 nm) membranes based on a polymer of intrinsic microporosity (PIM-EA-TB) supported on a poly-ethylene-terephthalate (PET) film with a 20 μm diameter microhole, and immersed in aqueous electrolyte media. Current rectification effects are observed for half-cells with the same electrolyte solution on both sides of the membrane for cases where cation and anion mobility differ (HCl, other acids, NaOH, etc.) but not for cases where cation and anion mobility are more alike (LiCl, NaCl, KCl, etc.). A pH-dependent reversal of the ionic diode effect is observed and discussed in terms of tentatively assigned mechanisms based on both (i) ion mobility within the PIM-EA-TB nano-membrane and (ii) a possible "mechanical valve effect" linked to membrane potential and electrokinetic movement of the membrane as well as hydrostatic pressure effects.

AB - "Ionic diode" (or current rectification) effects are potentially important for a range of applications including water purification. In this preliminary report, we observe novel ionic diode behaviour of thin (300 nm) membranes based on a polymer of intrinsic microporosity (PIM-EA-TB) supported on a poly-ethylene-terephthalate (PET) film with a 20 μm diameter microhole, and immersed in aqueous electrolyte media. Current rectification effects are observed for half-cells with the same electrolyte solution on both sides of the membrane for cases where cation and anion mobility differ (HCl, other acids, NaOH, etc.) but not for cases where cation and anion mobility are more alike (LiCl, NaCl, KCl, etc.). A pH-dependent reversal of the ionic diode effect is observed and discussed in terms of tentatively assigned mechanisms based on both (i) ion mobility within the PIM-EA-TB nano-membrane and (ii) a possible "mechanical valve effect" linked to membrane potential and electrokinetic movement of the membrane as well as hydrostatic pressure effects.

KW - Electrokinetic effects

KW - Electrophysiology

KW - Iontronics

KW - Membrane potential

KW - Nanofluidics

KW - Salt separation

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DO - 10.1016/j.elecom.2016.05.019

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SP - 41

EP - 45

JO - Electrochemistry Communications

JF - Electrochemistry Communications

ER -

pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity

Abstract

Keywords

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Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly

DESIGNER 3D MAGNETIC MESOSTRUCTURES

Simon Bending

Petra Cameron

Sara Dale

MC2- Surface analysis and spectroscopy

Cite this

pH-induced reversal of ionic diode polarity in 300 nm thin membranes based on a polymer of intrinsic microporosity

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Projects

Applying Long-Lived Metastable States in Switchable Functionality via Kinetic Control of Molecular Assembly

DESIGNER 3D MAGNETIC MESOSTRUCTURES

Profiles

Simon Bending

Petra Cameron

Sara Dale

Equipment

MC2- Surface analysis and spectroscopy

Cite this