Ion-Size Effect at the Surface of a Silica Hydrosol

Details Ion-Size Effect at the Surface of a Silica Hydrosol Ion-Size Effect at the Surface of a Silica Hydrosol

2008-08-28

arxiv.org/abs/0808.3940v1

J. Chem. Phys. 130, 024512 (2009).

Physics

Condensed Matter

Other Condensed Matter

17 pages, 4 figures

Scientific paper

10.1063/1.3056663

The author used synchrotron x-ray reflectivity to study the ion-size effect for alkali ions (Na$^+$, K$^+$, Rb$^+$, and Cs$^+$), with densities as high as $4 \times 10^{18}- 7 \times 10^{18}$ m$^{-2}$, suspended above the surface of a colloidal solution of silica nanoparticles in the field generated by the surface electric-double layer. According to the data, large alkali ions preferentially accumulate at the sol's surface replacing smaller ions, a finding that qualitatively agrees with the dependence of the Kharkats-Ulstrup single-ion electrostatic free energy on the ion's radius.

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