Selective Transport Membranes and their Applicability for Novel Sensors

Morf, Werner E.; Huser, Marin; Lindemann, Bernhard; Schulthess, Peter; Simon, W.

doi:10.1002/hlca.19860690607

Cited by 17 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It was shown that the selectivities realized in such ion transport experiments can basically be identified with the selectivity of ion/ionophore complex formation (referring to the aqueous phase) [18] [26] [29], and, hence, one expects for the present case:…”

Section: Lipophilic Derivatives Of Vitamin B (So-called Cobesters Smentioning

confidence: 98%

“…where Jx and Jy are the transmembrane ion fluxes, D is the diffusion coefficient, d the membrane thickness, ct,.t is the total concentration of ionophores, cx and cy are the anion concentrations in the aqueous solutions (') and (") (used for simplicity instead of activities), respectively, and KZy is the selectivity coefficient exhibited in anion counter transport. It was shown that the selectivities realized in such ion transport experiments can basically be identified with the selectivity of ion/ionophore complex formation (referring to the aqueous phase) [18] [26] [29], and, hence, one expects for the present case:…”

Section: Zero-current Counter Transport Mediated By Zonophoresmentioning

confidence: 99%

See 1 more Smart Citation

Transport Properties of Anion‐Selective Membranes Based on Cobyrinates and Metalloporphyrin Complexes as Ionophores

Huser

Morf

Fluri

et al. 1990

Helvetica Chimica Acta

Self Cite

View full text Add to dashboard Cite

Zero-current counter-transport studies as well as electrodialytic transport experiments on solvent polymeric membranes doped with ionophores for anions have been carried out and were compared with potentiometric measurements on the same membranes. A theoretical description of the observed phenomena corroborates that lipophilic complexes of Co(II1) (e.g. aquacyano[heptakis(2-phenylethyl)]Co(III) cobyrinate perchlorate) and Mn(II1) (e.g. lipophilic Mn(II1)porphyrin complexes) act as positively charged carriers for anions, whereas a lipophilic Ru(I1)porphyrin complex has to be described as an electrically neutral carrier for anions.Introduction. -Lipophilic derivatives of vitamin B,, (so-called cobesters such as aquocyano[heptakis(2-phenylethyl)]Co(III) cobyrinate perchlorate) were introduced

show abstract

Section: Lipophilic Derivatives Of Vitamin B (So-called Cobesters Smentioning

confidence: 98%

Section: Zero-current Counter Transport Mediated By Zonophoresmentioning

confidence: 99%

Transport Properties of Anion‐Selective Membranes Based on Cobyrinates and Metalloporphyrin Complexes as Ionophores

Huser

Morf

Fluri

et al. 1990

Helvetica Chimica Acta

Self Cite

View full text Add to dashboard Cite

show abstract

“…A variety of models have been used to describe the response of ion-selective solvent polymeric membrane electrodes (ISEs) [ 1-41, Whereas most authors agree in dividing the membrane potential into the sum of the two phase boundary potentials and the diffusion potential, there have been some debates about the relevance of the latter [4]. One reason was that no obvious explanation could be found for the observed permselectivity of such membranes.…”

Section: Introductionmentioning

confidence: 99%

Applicability of the phase boundary potential model to the mechanistic understanding of solvent polymeric membrane‐based ion‐selective electrodes

et al. 1995

View full text Add to dashboard Cite

Recent experimental evidence suggests that the equilibrium partitioning of sample ions at the sample/membrane interface is the main parameter governing the potentiometric response of polymeric membrane-based ion-selective electrodes (ISEs). It is shown that the response of a neutral-carrier-based H+-selective electrode can be fully predicted on the basis of equilibrium concentrations measured optically within a thin organic film having the same composition as the ISE membrane. Consequently, using this simple and powerful phase boundary potential model together with mass balances and observed complex formation constants, the response and selectivity of various ISE membranes may be described. In this contribution, the most recent applications of the model are reviewed including: (1) a novel and general selectivity description, which is related to the so-called matched potential method and clearly shows the limitations of the extended Nicolsky-Eisenman equation if ions of different charge are considered; (2) the measuring range of neutral-carrier-based H + -selective ISEs, showing that previous experimental findings can now be explained by theory; (3) prediction of the influence of anionic and cationic sites on the selectivity of charged-carrier-based ISEs demonstrating that such ISE membranes need the incorporation of sites of the same charge type as the analyte ion to induce optimum potentiometric selectivity; and (4) the determination of the concentration of anionic impurities in poly(viny1 chloride) by measuring the influence of the anionic site concentration on the divalent/monovalent ion selectivity of a neutralcarrier-based ISE.

show abstract

“…10,11 Within this realm, selective optical sensors, phase transfer catalysts, and chromatographic stationary phases have been prepared and used for the determination and separation of different anionic species. 12 However, the weak nature of the anionreceptor interactions, reflecting the relatively low charge density of most anions, prompted researchers to design sophisticated anion receptor systems to achieve better control of recognition and selectivity. While many reported anion receptors have proven to be quite effective, 13,14 calix [4]pyrroles (1 and 2 in Figure 1) have become some of the anion receptors that are easiest to make.…”

Section: Introductionmentioning

confidence: 99%