Open the gate: Thermoresponsive gating membranes based on interpenetrating polymer networks composed of polyacrylamide (PAAM) and poly(acrylic acid) (PAAC) have inverse gating characteristics, with opening of the membrane pores induced by a decrease rather than an increase in temperature (see picture; UCST=upper critical solution temperature). The membranes provide a new mode of phase-transition behavior for thermoresponsive “smart” membrane actuators.
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Chu et al. (2005) studied this question.
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