Controlling the transport of cations through permselective mesoporous alumina layers by manipulation of electric field and ionic strength

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)

Abstract

The electric field-driven transport of ions through supported mesoporous γ-alumina membranes was investigated. The influence of ion concentration, ion valency, pH, ionic strength, and electrolyte composition on transport behavior was determined. The permselectivity of the membrane was found to be highly dependent on the ionic strength. When the ionic strength was sufficiently low for electrical double-layer overlap to occur inside the pores, the membrane was found to be cation-permselective and the transport rate of cations could be tuned by variation of the potential difference over the membrane. The cation permselectivity is thought to be due to the adsorption of anions onto the pore walls, causing a net negative immobile surface charge density, and consequently, a positively charged mobile double layer. The transport mechanism of cations was interpreted in terms of a combination of Fick diffusion and ion migration. By variation of the potential difference over the membrane the transport of double-charged cations, Cu2 +, could be controlled accurately, effectively resulting in on/off tunable transport. In the absence of double-layer overlap at high ionic strength, the membrane was found to be nonselective.
Original languageUndefined
Pages (from-to)331-338
Number of pages8
JournalJournal of colloid and interface science
Volume273
Issue number1
DOIs
Publication statusPublished - 2004

Keywords

  • Alumina
  • Double layer
  • Membrane
  • IR-47723
  • Transport
  • Permselectivity
  • METIS-218569
  • Mesoporous

Cite this

@article{59728788afc742dab96043e191e368b5,
title = "Controlling the transport of cations through permselective mesoporous alumina layers by manipulation of electric field and ionic strength",
abstract = "The electric field-driven transport of ions through supported mesoporous γ-alumina membranes was investigated. The influence of ion concentration, ion valency, pH, ionic strength, and electrolyte composition on transport behavior was determined. The permselectivity of the membrane was found to be highly dependent on the ionic strength. When the ionic strength was sufficiently low for electrical double-layer overlap to occur inside the pores, the membrane was found to be cation-permselective and the transport rate of cations could be tuned by variation of the potential difference over the membrane. The cation permselectivity is thought to be due to the adsorption of anions onto the pore walls, causing a net negative immobile surface charge density, and consequently, a positively charged mobile double layer. The transport mechanism of cations was interpreted in terms of a combination of Fick diffusion and ion migration. By variation of the potential difference over the membrane the transport of double-charged cations, Cu2 +, could be controlled accurately, effectively resulting in on/off tunable transport. In the absence of double-layer overlap at high ionic strength, the membrane was found to be nonselective.",
keywords = "Alumina, Double layer, Membrane, IR-47723, Transport, Permselectivity, METIS-218569, Mesoporous",
author = "R. Schmuhl and Klaas Keizer and {van den Berg}, Albert and {ten Elshof}, {Johan E.} and Blank, {David H.A.}",
year = "2004",
doi = "10.1016/j.jcis.2003.10.024",
language = "Undefined",
volume = "273",
pages = "331--338",
journal = "Journal of colloid and interface science",
issn = "0021-9797",
publisher = "Academic Press Inc.",
number = "1",

}

TY - JOUR

T1 - Controlling the transport of cations through permselective mesoporous alumina layers by manipulation of electric field and ionic strength

AU - Schmuhl, R.

AU - Keizer, Klaas

AU - van den Berg, Albert

AU - ten Elshof, Johan E.

AU - Blank, David H.A.

PY - 2004

Y1 - 2004

N2 - The electric field-driven transport of ions through supported mesoporous γ-alumina membranes was investigated. The influence of ion concentration, ion valency, pH, ionic strength, and electrolyte composition on transport behavior was determined. The permselectivity of the membrane was found to be highly dependent on the ionic strength. When the ionic strength was sufficiently low for electrical double-layer overlap to occur inside the pores, the membrane was found to be cation-permselective and the transport rate of cations could be tuned by variation of the potential difference over the membrane. The cation permselectivity is thought to be due to the adsorption of anions onto the pore walls, causing a net negative immobile surface charge density, and consequently, a positively charged mobile double layer. The transport mechanism of cations was interpreted in terms of a combination of Fick diffusion and ion migration. By variation of the potential difference over the membrane the transport of double-charged cations, Cu2 +, could be controlled accurately, effectively resulting in on/off tunable transport. In the absence of double-layer overlap at high ionic strength, the membrane was found to be nonselective.

AB - The electric field-driven transport of ions through supported mesoporous γ-alumina membranes was investigated. The influence of ion concentration, ion valency, pH, ionic strength, and electrolyte composition on transport behavior was determined. The permselectivity of the membrane was found to be highly dependent on the ionic strength. When the ionic strength was sufficiently low for electrical double-layer overlap to occur inside the pores, the membrane was found to be cation-permselective and the transport rate of cations could be tuned by variation of the potential difference over the membrane. The cation permselectivity is thought to be due to the adsorption of anions onto the pore walls, causing a net negative immobile surface charge density, and consequently, a positively charged mobile double layer. The transport mechanism of cations was interpreted in terms of a combination of Fick diffusion and ion migration. By variation of the potential difference over the membrane the transport of double-charged cations, Cu2 +, could be controlled accurately, effectively resulting in on/off tunable transport. In the absence of double-layer overlap at high ionic strength, the membrane was found to be nonselective.

KW - Alumina

KW - Double layer

KW - Membrane

KW - IR-47723

KW - Transport

KW - Permselectivity

KW - METIS-218569

KW - Mesoporous

U2 - 10.1016/j.jcis.2003.10.024

DO - 10.1016/j.jcis.2003.10.024

M3 - Article

VL - 273

SP - 331

EP - 338

JO - Journal of colloid and interface science

JF - Journal of colloid and interface science

SN - 0021-9797

IS - 1

ER -