Alkali-cation transport through supported liquid membranes mediated by solvent-linked carriers

Herman C. Visser, Remco Vink, Bianca H.M. Snellink-Ruel, Simone B.M. Kokhuis, Sybolt Harkema, Feike de Jong, David N. Reinhoudt

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Abstract

Neutral macrocyclic alkali‐cation receptors have been covalently linked to one or more molecules of the membrane solvent 2‐nitrophenyl n‐octyl ether (NPOE). These compounds are all highly lipophilic and soluble in NPOE. The flux of alkali‐perchlorate salts through supported liquid membranes (SLMs) has been optimized by variation of the carrier content in the membrane and the temperature. With all carriers, the optimum flux is reached at carrier contents of about 20% (w/w) in NPOE. Above this carrier content the flux decreases because of an increase in the viscosity of the membrane solutions. Relatively low activation energies for transport indicate that the transport is diffusion‐limited. The excellent compatibility between the carriers and the membrane solvent leads to very stable membranes (NPOE/Accurel®). The mechanism of alkali perchlorate transport has been investigated by variation of the source‐phase salt activity and the carrier concentration. Indications about ion pair formation and 2/1 carrier/cation complexation have been obtained from variation of the carrier concentration and transport selectivity measurements.
Original languageEnglish
Pages (from-to)285-294
Number of pages10
JournalRecueil des travaux chimiques des Pays-Bas
Volume114
Issue number6
DOIs
Publication statusPublished - 1995

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Liquid membranes
Alkalies
Cations
Membranes
Fluxes
Carrier concentration
Salts
Carrier transport
Complexation
Ether
Activation energy
Viscosity
Ions
Molecules
Temperature

Cite this

Visser, Herman C. ; Vink, Remco ; Snellink-Ruel, Bianca H.M. ; Kokhuis, Simone B.M. ; Harkema, Sybolt ; de Jong, Feike ; Reinhoudt, David N. / Alkali-cation transport through supported liquid membranes mediated by solvent-linked carriers. In: Recueil des travaux chimiques des Pays-Bas. 1995 ; Vol. 114, No. 6. pp. 285-294.
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abstract = "Neutral macrocyclic alkali‐cation receptors have been covalently linked to one or more molecules of the membrane solvent 2‐nitrophenyl n‐octyl ether (NPOE). These compounds are all highly lipophilic and soluble in NPOE. The flux of alkali‐perchlorate salts through supported liquid membranes (SLMs) has been optimized by variation of the carrier content in the membrane and the temperature. With all carriers, the optimum flux is reached at carrier contents of about 20{\%} (w/w) in NPOE. Above this carrier content the flux decreases because of an increase in the viscosity of the membrane solutions. Relatively low activation energies for transport indicate that the transport is diffusion‐limited. The excellent compatibility between the carriers and the membrane solvent leads to very stable membranes (NPOE/Accurel{\circledR}). The mechanism of alkali perchlorate transport has been investigated by variation of the source‐phase salt activity and the carrier concentration. Indications about ion pair formation and 2/1 carrier/cation complexation have been obtained from variation of the carrier concentration and transport selectivity measurements.",
author = "Visser, {Herman C.} and Remco Vink and Snellink-Ruel, {Bianca H.M.} and Kokhuis, {Simone B.M.} and Sybolt Harkema and {de Jong}, Feike and Reinhoudt, {David N.}",
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Alkali-cation transport through supported liquid membranes mediated by solvent-linked carriers. / Visser, Herman C.; Vink, Remco; Snellink-Ruel, Bianca H.M.; Kokhuis, Simone B.M.; Harkema, Sybolt; de Jong, Feike; Reinhoudt, David N.

In: Recueil des travaux chimiques des Pays-Bas, Vol. 114, No. 6, 1995, p. 285-294.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Alkali-cation transport through supported liquid membranes mediated by solvent-linked carriers

AU - Visser, Herman C.

AU - Vink, Remco

AU - Snellink-Ruel, Bianca H.M.

AU - Kokhuis, Simone B.M.

AU - Harkema, Sybolt

AU - de Jong, Feike

AU - Reinhoudt, David N.

PY - 1995

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AB - Neutral macrocyclic alkali‐cation receptors have been covalently linked to one or more molecules of the membrane solvent 2‐nitrophenyl n‐octyl ether (NPOE). These compounds are all highly lipophilic and soluble in NPOE. The flux of alkali‐perchlorate salts through supported liquid membranes (SLMs) has been optimized by variation of the carrier content in the membrane and the temperature. With all carriers, the optimum flux is reached at carrier contents of about 20% (w/w) in NPOE. Above this carrier content the flux decreases because of an increase in the viscosity of the membrane solutions. Relatively low activation energies for transport indicate that the transport is diffusion‐limited. The excellent compatibility between the carriers and the membrane solvent leads to very stable membranes (NPOE/Accurel®). The mechanism of alkali perchlorate transport has been investigated by variation of the source‐phase salt activity and the carrier concentration. Indications about ion pair formation and 2/1 carrier/cation complexation have been obtained from variation of the carrier concentration and transport selectivity measurements.

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