Potentiometric and chromatographic evaluation of ion uptake by zwitterionic micelles

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Publication Date
DOI 10.1039/A903531A
Impact Factor 3.676
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Abstract

A model has been derived from the Poisson–Boltzmann equation to describe the uptake of ions by a zwitterionic micelle. Two mechanisms representing uptake selectivity are included in the model; (1) a difference in the standard chemical potential of an ion between the bulk solution (partition mechanism) and (2) the micelles and ion-pair formation at the charged surfaces (ion-pair mechanism). In order to confirm the applicability of the derived model, the uptake of ions is evaluated by two independent experiments, i.e. potentiometry and chromatography, and compared with the calculation. Both the partition and the ion-pair mechanism similarly explain the ion uptake by the zwitterionic micelles. The standard chemical potential differences are estimated -5.0 kJ mol-1 for I- and -8.5 kJ mol-1 for SCN- when employing the partition mechanism, while the ion-pair formation constants are 0.12 M-1 for I- and 0.7 M-1 for SCN- with the ion-pair mechanism. These parameters depend strongly on the micellar sizes, but well reflect the nature of anions irrespective of size parameters involved in the calculation.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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