I read about the following apparatus:
A glas tube with a stopper on each end is divided into two chambers with a glas frit. In one of the chambers a, for example, Ba-acetate solution is placed, in the other an ammonium carbonate solution. Ions diffuse from one chamber to the other, resulting a in a slow precitipation of BaCO3 on the surface of the frit.
Unfortunately I don't know the name of that apparatus, if there is any and if it is available commercially. Does anyone know?
What you are describing is a diaphragm diffusion cell. It has been used in various studies of diffusion and chemical reactions for more than a century. There are many different variants of this type of device. Any reasonable glassblower can make your apparatus with a frit. You will probably want to buy a frit of know porosity from a manufacturer for your glassblower. At one time, there were many chemical apparatus manufacturers that would make this.
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