### Ion-Size Effect at the Surface of a Silica HydrosolIon-Size Effect at the Surface of a Silica Hydrosol

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 Author Tikhonov, Aleksey M. Source arXiv.org Content type Text File Format PDF Date of Submission 2008-08-28 Language English
 Subject Domain (in DDC) Computer science, information & general works ♦ Natural sciences & mathematics ♦ Physics Subject Keyword Condensed Matter - Other Condensed Matter ♦ Condensed Matter - Materials Science ♦ physics:cond-mat Abstract 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. Description Reference: J. Chem. Phys. 130, 024512 (2009). Educational Use Research Learning Resource Type Article Page Count 17