Ion binding to interfaces

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Ion binding to interfaces. / Wennerström, Håkan.

I: Current Opinion in Colloid & Interface Science, Vol. 9, Nr. 1-2, 2004, s. 163-164.

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TY - JOUR

T1 - Ion binding to interfaces

AU - Wennerström, Håkan

PY - 2004

Y1 - 2004

N2 - A multitude of crucial chemical phenomena occur in the region where an aqueous medium meets a more apolar environment. The change in the character of the medium can be due to a macroscopic phase boundary, but it is much more common that it is due to the presence of an aggregate, a macromolecule or even an apolar molecule of moderate size. One aspect of such a transition region from polar to apolar is how small ions respond to such an environment. Based on a purely electrostatic point charge model one would expect the ions to be repelled by the apolar medium since it is less effective in accommodating the electric field emanating from the charge. This effect is often described as due to the repulsion between the source charge and its image and its consequences for the surface tension of aqueous electrolyte solutions were worked out by Onsager and Samaras. Cations like alkali metal ions and alkaline earth metal ions largely respond to apolar environments as one would expect from the simple electrostatics model, but for anions, like the halogen ions, there are large quantitative and even qualitative deviations. (C) 2004 Elsevier Ltd. All rights reserved.

AB - A multitude of crucial chemical phenomena occur in the region where an aqueous medium meets a more apolar environment. The change in the character of the medium can be due to a macroscopic phase boundary, but it is much more common that it is due to the presence of an aggregate, a macromolecule or even an apolar molecule of moderate size. One aspect of such a transition region from polar to apolar is how small ions respond to such an environment. Based on a purely electrostatic point charge model one would expect the ions to be repelled by the apolar medium since it is less effective in accommodating the electric field emanating from the charge. This effect is often described as due to the repulsion between the source charge and its image and its consequences for the surface tension of aqueous electrolyte solutions were worked out by Onsager and Samaras. Cations like alkali metal ions and alkaline earth metal ions largely respond to apolar environments as one would expect from the simple electrostatics model, but for anions, like the halogen ions, there are large quantitative and even qualitative deviations. (C) 2004 Elsevier Ltd. All rights reserved.

KW - Ion binding

KW - Aqueous medium

KW - Polar–apolar transition

U2 - 10.1016/j.cocis.2004.05.023

DO - 10.1016/j.cocis.2004.05.023

M3 - Review article

VL - 9

SP - 163

EP - 164

JO - Current Opinion in Colloid and Interface Science

JF - Current Opinion in Colloid and Interface Science

SN - 1359-0294

IS - 1-2

ER -