Potentiometric and impedance studies of membranes based on anion-exchanger and lipophilic inert electrolyte ETH 500

Makarychev-Mikhailov, Sergey; Mortensen, John; Vlasov, Yuri

doi:10.1016/j.electacta.2004.07.001

Cited by 11 publications

(14 citation statements)

References 22 publications

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“…This conclusion is supported by the fact that conductivity increase per unit of added ETH 500 is actually more than 10 times higher in membranes plasticized with o-NPOE than DOS (see Fig. 3(a) in reference [22] which is a similar plot to Fig. 2 in this paper).…”

Section: Resultssupporting

confidence: 83%

“…A large difference between the effects of added lipophilic electrolytes on the resistivities of DOS and o-NPOE plasticized membranes was also observed with TDDMACl-based anion-selective membranes [22]. Upon the incorporation of the same amounts of ETH 500 into these membranes, the increase in the absolute conductivity was much larger with o-NPOE than with DOS plasticized membranes.…”

Section: Resultsmentioning

confidence: 93%

“…However, ETH 500 had little effect on the membrane resistance for membranes that already had high ionophore and lipophilic salt concentrations, probably due to ion-pair formation at high concentrations [18]. More recently, the incorporation of ETH 500 into DOS and o-NPOE-plasticized tridodecylmethylammoniumchloride (TDDMACl)-based anion-exchange membranes resulted in large, concentration-dependent decreases in the membrane resistance [22]. In these anion-exchange membranes, the incorporation of ETH 500 decreased the membrane resistance significantly more than the incorporation of TDDMACl, indicating much larger dissociation constant for ETH 500 than for TDDMACl [23].…”

Section: Introductionmentioning

confidence: 99%

“…In general, o-NPOE plasticized membranes have smaller resistances than DOS plasticized ones [22, 23, 27]. This reduced resistance is because the concentration of ionic impurities in o-NPOE is much larger than in DOS [27, 28].…”

Section: Introductionmentioning

confidence: 99%

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Current-polarized ion-selective membranes: The influence of plasticizer and lipophilic background electrolyte on concentration profiles, resistance, and voltage transients

Zook

Langmaier

Lindner

2009

Sensors and Actuators B: Chemical

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Lipophilic background electrolytes consisting of a lipophilic cation and a lipophilic anion, such as tetradodecylammonium tetrakis(4-chlorophenyl) borate (ETH 500), or bis(triphenylphosphoranylidene) ammonium tetrakis[3,5bis(trifluoromethyl) phenyl] borate (BTPPATFPB) are incorporated into the membranes of ion-selective electrodes (ISEs) to improve the detection limit and selectivity of the electrodes and decrease the resistance of the sensing membrane. In this work, spectroelectrochemical microscopy (SpECM) is used in conjunction with chronopotentiometry to quantify the effects of a lipophilic background electrolyte on the concentration profiles induced inside current-polarized membranes and on the measured voltage transients in chronopotentiometric experiments. In agreement with the theoretical model, the lipophilic background electrolyte incorporated into o-NPOE or DOS plasticized membranes decreases the membrane resistance and thus the contribution of migration in the overall transport across ion-selective membranes. Consequently, it has a significant influence on the changing concentration profiles of the ion-ionophore complex during chronopotentiometric experiments.

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Section: Resultssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Current-polarized ion-selective membranes: The influence of plasticizer and lipophilic background electrolyte on concentration profiles, resistance, and voltage transients

Zook

Langmaier

Lindner

2009

Sensors and Actuators B: Chemical

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“…The salt chosen is tetradodecylammonium tetrakis(4-chlorophenyl)borate (TDDAClTpClPB or ETH 500), a highly lipophilic salt commonly used in membranes of ion-selective electrodes [10,11]. The starting materials are the potassium salt of the anion (KTpClPB) and the chloride salt of the cation (TDDACl).…”

Section: Introductionmentioning

confidence: 99%

Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry

Silvester

Grygołowicz‐Pawlak

Bakker

2010

Electrochemistry Communications

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Many ionic salts synthesized using metathesis are often found to contain significant amounts of impurities, despite careful control of the weighing of starting materials. In this work, a potentiometric method is devised to monitor ion-exchange properties (or 'purity') of an organic solvent containing a lipophilic electrolyte. Its permselective behaviour is monitored by treating the solvent as a liquid membrane and contacting it with two aqueous solutions with different electrolyte activities. This electrolyte mismatch results in a drastic potential change when excess lipophilic cation-exchanger is titrated with anion-exchanger, altering the membrane from being cation to anion responsive.Here, the cation-exchanger potassium tetrakis(4-chlorophenyl)borate (KTpClPB) dissolved in nitrobenzene was titrated with tetradodecylammonium chloride (TDDACl), in contact with Ag/AgCl electrodes placed in aqueous 1M and 10 -2 M KCl, respectively.The predicted potential change of -214mV was observed at the equivalence point, forming the inert lipophilic electrolyte ETH 500, in a very small concentration range of added anion-exchanger (0.8% for ±10mV), suggesting good precision. The approach was confirmed by monitoring absorbance and fluorescence intensity changes of the chromoionophore Nile Blue. This method may be applied for the synthesis of a range of highly lipophilic salts for which established metathesis protocols are not suitable. KeywordsETH 500, potentiometry, ionic liquid purity, inert lipophilic electrolyte purity, Nile Blue, spectrophotometry 2

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Self‐Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications

Chimisso

Maffeis

Hürlimann

et al. 2019

Macromolecular Bioscience

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Biomembranes play a crucial role in a multitude of biological processes, where high selectivity and efficiency are key points in the reaction course. The outstanding performance of biological membranes is based on the coupling between the membrane and biomolecules, such as membrane proteins. Polymer‐based membranes and assemblies represent a great alternative to lipid ones, as their presence not only dramatically increases the mechanical stability of such systems, but also opens the scope to a broad range of chemical functionalities, which can be fine‐tuned to selectively combine with a specific biomolecule. Tethering the membranes or nanoassemblies on a solid support opens the way to a class of functional surfaces finding application as sensors, biocomputing systems, molecular recognition, and filtration membranes. Herein, the design, physical assembly, and biomolecule attachment/insertion on/within solid‐supported polymeric membranes and nanoassemblies are presented in detail with relevant examples. Furthermore, the models and applications for these materials are highlighted with the recent advances in each field.

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Potentiometric and impedance studies of membranes based on anion-exchanger and lipophilic inert electrolyte ETH 500

Cited by 11 publications

References 22 publications

Current-polarized ion-selective membranes: The influence of plasticizer and lipophilic background electrolyte on concentration profiles, resistance, and voltage transients

Current-polarized ion-selective membranes: The influence of plasticizer and lipophilic background electrolyte on concentration profiles, resistance, and voltage transients

Assessing ion-exchange properties and purity of lipophilic electrolytes by potentiometry and spectrophotometry

Self‐Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications

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