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A decision-making capsule! Where cation trafficking comes to a halt is predetermined, with the process corresponding to a “nano-ion chromatograph” in action: starting from pores the route may end in a finely sculpturable interior of a stable, soluble spherical capsule but in many cases it ends in between in channels that exhibit a variety of cation-capturing functionalities at different positions (one of the twenty channels is shown with the residing cations).
Müller et al. (2003) studied this question.