Abstract
The binding of an anionic surfactant onto an anionic surface by addition of divalent ions is reported based on experimental data from specular neutron reflection (NR) and attenuated total internal reflection IR spectroscopy (ATR-IR). Similar measurements using monovalent ions (sodium) do not show any evidence of such adsorption, even though the amount of surfactant can be much higher. This data is interpreted in terms of the so-called bridging mechanism of ion binding.
Highlights
The adsorption of surfactants and other species from solution to solid surfaces underpins many academic and commercially important systems from detergency to oil recovery
Thorarinn et al.[7] proposed that the mechanism of cation bridging plays an important role in adsorption of organic matter onto montmorillonite, since the calcium ions enhanced the adsorption, while there was no such enhancement with sodium ions
Attenuated total reflection infrared (ATR-IR) experiments were performed on a PerkinElmer Spectrum 100 FTIR spectrometer in the Department of Chemistry, University of Cambridge
Summary
The adsorption of surfactants and other species from solution to solid surfaces underpins many academic and commercially important systems from detergency to oil recovery. Where the refractive index of a sample liquid is n2 at a wavelength, λ, the refractive index of the internal reflection element, n1, and the angle of incidence, θ (for example, n of Si crystal = 3.4) This gives rise to an enhanced intensity in the IR spectrum of material close to the IRE surface. Attenuated total reflection infrared (ATR-IR) experiments were performed on a PerkinElmer Spectrum 100 FTIR spectrometer (fitted with a liquid nitrogen cooled mercury cadmium telluride detector) in the Department of Chemistry, University of Cambridge This device uses a trapezoidal silicon IRE (50 × 20 × 2 mm, CRYSTRAN Ltd.) in a solid/liquid cell. Essentially similar results were obtained in both stainless steel and Teflon cells
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