Abstract
We prepared silica colloidal membranes suspended in glass openings and containing no major mechanical defects. The surface of these colloidal membranes was modified with amine groups. The diffusion rate of Fe(bpy) 3 2+ through the suspended amine-modified colloidal membranes was attenuated by adding acid to the solution. The amine-modified colloidal membranes displayed an average selectivity (the ratio of diffusion rates in the absense and presence of the acid) of 2.6 for Fe(bpy) 3 2+ . This selectivity is believed to result from the electrostatic repulsion between the protonated amine-modified membrane surface and positively charged Fe(bpy) 3 2+ and was confirmed by observing no change in (1) the diffusion rate of Fe(bpy) 3 2+ through an unmodified suspended colloidal membrane, and (2) the diffusion rate of a neutral molecule through the amine-modified colloidal membrane with and without the acid present in solution.
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