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Ultrathin polyelectrolyte gel pH-responsive membranes with sub-micrometer pore size are synthesized on planar substrates. The membranes are thin porous films made of a crosslinked polyelectrolyte that can be easily transferred onto various porous and nonporous substrates for the fabrication of devices with pH-controllable permeability (see figure).
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Tokarev et al. (2006) studied this question.
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