Anisotropic structure and transport in self-assembled layered polymer-clay nanocomposites.
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Using the layer-by-layer (LbL) assembly technique, we create a polymer-clay structure from a unique combination of LbL materials: poly(ethylene imine), Laponite clay, and poly(ethylene oxide). This trilayer LbL structure is assembled using a combination of hydrogen bonding and electrostatic interactions. The films were characterized using ellipsometry, profilometry, X-ray photon spectroscopy, atomic force microscopy, scanning electron microscopy, wide-angle X-ray diffraction, grazing-incidence small-angle X-ray scattering, and electrochemical impedance spectroscopy (EIS). We observe a layered, anisotropic structure, which resulted in in-plane ion transport 100 times faster than cross-plane at 0% relative humidity. This study represents a first application of EIS in determining anisotropic ion transport in LbL assemblies and its correlation to structural anisotropy.
author list (cited authors)
Lutkenhaus, J. L., Olivetti, E. A., Verploegen, E. A., Cord, B. M., Sadoway, D. R., & Hammond, P. T.
complete list of authors
Lutkenhaus, Jodie L||Olivetti, Elsa A||Verploegen, Eric A||Cord, Bryan M||Sadoway, Donald R||Hammond, Paula T