Ion distributions at the nitrobenzene-water interface electrified by a common ion

Journal Article · Fri Oct 03 04:00:00 EDT 2008 · Journal of Electroanalytical Chemistry

DOI:https://doi.org/10.1016/j.jelechem.2006.03.051· OSTI ID:1007737

Luo, Guangming; Malkova, Sarka; Yoon, Jaesung; Schultz, David G; Lin, Binhua; Meron, Mati; Benjamin, Ilan; Vanysek, Petr; Schlossman, Mark L ^[1]

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1. NIU

Synchrotron X-ray reflectivity is used to study ion distributions at the liquid-liquid interface between a nitrobenzene solution of tetrabutylammonium tetraphenylborate (TBATPB) and a water solution of tetrabutylammonium bromide (TBABr). The concentration of TBABr is varied to alter the ion distribution. Our X-ray measurements are inconsistent with several commonly used theories of ion distributions, including Gouy-Chapman, modified Verwey-Niessen, and the MPB5 version of the Poisson-Boltzmann equation. These structural measurements are described well by ion distributions predicted by a version of the Poisson-Boltzmann equation that explicitly includes a free energy profile for ion transfer across the interface when this profile is described by a simple analytic form or by a potential of mean force from molecular dynamics simulations. These X-ray measurements from the liquid-liquid interface provide evidence for the importance of interfacial liquid structure in determining interfacial ion distributions.

• Research Organization: Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
• Sponsoring Organization: USDOE
• OSTI ID: 1007737
• Journal Information: Journal of Electroanalytical Chemistry, Journal Name: Journal of Electroanalytical Chemistry Journal Issue: (1-2) ; 08, 2006 Vol. 593; ISSN JEACAX; ISSN 0368-1874
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

43 PARTICLE ACCELERATORS
AQUEOUS SOLUTIONS
BROMIDES
DISTRIBUTION
FREE ENERGY
NITROBENZENE
REFLECTIVITY
SYNCHROTRONS