Resumo da Palestra:

“Polymers with Intrinsic Microporosity (PIMs) provide a novel class of structurally rigid ion-selective membrane materials with 3D nanofluidic pores of typically 1-5 nm size. The PIM-EA-TB material employed here is based on a poly-amine with estimated pKA1 = 4.0 and pKA2 = 0.4 and therefore in the protonated state an anion-conductor.
The microporous material can be employed to “heterogenise” water-insoluble molecular redox systems in films at the electrode
surface [1,2]. When deposited asymmetrically over a 20 micron diameter hole in poly-ethylene-terephthalate (PET) and investigated in a
two-compartment electrochemical cell with aqueous electrolyte on both sides, ionic diode effects [3] (associated with pKA1) are observed.
Further studies with nano-membranes of spin-coated PIM-EA-TB also suggest ion flow rectification effects with potential for future
applications in iontronics and water desalination [4].
References:
[1] Rong YY, Malpass-Evans R, Carta M, McKeown NB, Attard GA, Marken
F, Electrochem. Commun. 2014, 46, 26-29.
[2] Kolodziej A, Ahn SD, Carta M, Malpass-Evans R, McKeown NB,
Chapman RSL, Bull SD, Marken F, Electrochim. Acta 2015, 160, 195-201.
[3] Madrid E, Rong YY, Carta M, McKeown NB, Malpass-Evans R, Attard
GA, Clarke TJ, Taylor SH, Long YT, Marken F, Angew. Chem. Int. Ed. 2014,
53, 10751-10754.
[4] Madrid E, Cottis P, Rong YY, Rogers AT, Stone JM, Malpass-Evans
R, Carta M, McKeown NB, Marken F, J. Mater. Chem. A 2015, 3, 15849-15853.”