Potassium, Calcium, and Magnesium Bridging of AOT to Mica at Constant Ionic Strength

Finian J. Allen; Chris L. Truscott; Philipp Gutfreund; Rebecca J.L. Welbourn; Stuart M. Clarke

doi:10.1021/acs.langmuir.9b00533

Potassium, Calcium, and Magnesium Bridging of AOT to Mica at Constant Ionic Strength

Finian J. Allen, Chris L. Truscott, Philipp Gutfreund, Rebecca J.L. Welbourn, Stuart M. Clarke

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

The bridging effect of a series of common cations between the anionic mica surface and the AOT anion has been studied in a condition of constant ionic strength and surfactant concentration. It was found that sodium ions did not show any bridging effect in this system; however, calcium, magnesium, and potassium all caused adsorption of the organic to the mica surface. The concentrations at which bridging occurred was probed, revealing that only a very low bridging cation concentration was required for binding. The bridged layer stability was also investigated, and the interaction was shown to be a weak one, with the bound layer in equilibrium with the species in the bulk and easily removed. Even maintaining ionic strength and bridging ion concentration was not sufficient to retain the layer when the free organic in solution was removed.

Original language	English
Pages (from-to)	5753-5761
Number of pages	9
Journal	Langmuir
Volume	35
Issue number	17
DOIs	https://doi.org/10.1021/acs.langmuir.9b00533
State	Published - Apr 30 2019
Externally published	Yes

Funding

The authors thank EPSRC and BP plc for the funding (RG8620) that made this work possible. The authors also thank the ILL (9-10-1545, DOI:10.5291/ILL-DATA.9-10-1545),42 ISIS (RB1820049, DOI: 10.5286/ISIS.E.99688055), and the beamtime committees for their allocations of time. The authors also thank the invaluable beamline scientists for their support and expertise.

Funders	Funder number
BP	RG8620
BP
Engineering and Physical Sciences Research Council	1799423, EP/R00496X/1
Engineering and Physical Sciences Research Council

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abstract = "The bridging effect of a series of common cations between the anionic mica surface and the AOT anion has been studied in a condition of constant ionic strength and surfactant concentration. It was found that sodium ions did not show any bridging effect in this system; however, calcium, magnesium, and potassium all caused adsorption of the organic to the mica surface. The concentrations at which bridging occurred was probed, revealing that only a very low bridging cation concentration was required for binding. The bridged layer stability was also investigated, and the interaction was shown to be a weak one, with the bound layer in equilibrium with the species in the bulk and easily removed. Even maintaining ionic strength and bridging ion concentration was not sufficient to retain the layer when the free organic in solution was removed.",

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AU - Clarke, Stuart M.

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AB - The bridging effect of a series of common cations between the anionic mica surface and the AOT anion has been studied in a condition of constant ionic strength and surfactant concentration. It was found that sodium ions did not show any bridging effect in this system; however, calcium, magnesium, and potassium all caused adsorption of the organic to the mica surface. The concentrations at which bridging occurred was probed, revealing that only a very low bridging cation concentration was required for binding. The bridged layer stability was also investigated, and the interaction was shown to be a weak one, with the bound layer in equilibrium with the species in the bulk and easily removed. Even maintaining ionic strength and bridging ion concentration was not sufficient to retain the layer when the free organic in solution was removed.

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Potassium, Calcium, and Magnesium Bridging of AOT to Mica at Constant Ionic Strength

Abstract

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