✍ Scribed by U Costantino; M Casciola; G Pani; D.J Jones; J Rozière
No coin nor oath required. For personal study only.
New hybrid inorganic-organic nanocomposite systems have been obtained by intercalation of polyethyleneimine (PEI, 4 5 3 10 Da) into aand g-structured zirconium phosphates. The composites can be formulated as a-Zr(HPO ) ? 2.7(PEI) ? 4 2 1.8H O and g-Zr(PO )(H PO ) ? 1.03(PEI) ? 3.3H O, when dried at room temperature and 75% RH. The corresponding 2 4 2 4 2
interlayer distances are 2.0 and 2.5 nm, respectively. The ac conductivity of the g-nanocomposite at 1008C and 82% RH, is 25 27 significantly higher (2.6 3 10 S / cm) than that of the a-intercalate (4.8 3 10 S / cm). Vibrational spectroscopies (IR and incoherent inelastic neutron scattering) have shown that increasing the temperature induces progressive proton transfer from
the host layer surfaces to the guest, with successive formation of protonated NH and NH groups (arising from secondary 2 3 and primary amine groups respectively). Proton transfer is, however, more complete in a-ZrP-PEI.
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