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Fast assembly of bio-inspired nanocomposite films

Published online by Cambridge University Press:  31 January 2011

Viatcheslav Vertlib ,
Marianne Dietiker ,
Michael Plötze ,
Lee Yezek ,
Ralph Spolenak  and
Alexander M. Puzrin
Viatcheslav Vertlib
Affiliation:
Laboratory for Clay Mineralogy, Institute for Geotechnical Engineering, ETH Zurich, 8093 Zurich, Switzerland
Marianne Dietiker
Affiliation:
Laboratory for Nanometallurgy, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
Michael Plötze*
Affiliation:
Laboratory for Clay Mineralogy, Institute for Geotechnical Engineering, ETH Zurich, 8093 Zurich, Switzerland
Lee Yezek
Affiliation:
Laboratory for Clay Mineralogy, Institute for Geotechnical Engineering, ETH Zurich, 8093 Zurich, Switzerland
Ralph Spolenak
Affiliation:
Laboratory for Nanometallurgy, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland
Alexander M. Puzrin
Affiliation:
Laboratory for Clay Mineralogy, Institute for Geotechnical Engineering, ETH Zurich, 8093 Zurich, Switzerland
*
a)Address all correspondence to this author.e-mail: michael.ploetze@igt.baug.ethz.ch
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Abstract

This paper presents a spin-coating layer-by-layer assembly process to prepare multilayered polyelectrolyte-clay nanocomposites. This method allows for the fast production of films with controlled layered structure. The preparation of a 100-bilayer film with a thickness of about 330 nm needs less than 1 h, which is 20 times faster than conventional dip-coating processes maintaining the same hardness and modulus values. For validation of this technique, nanocomposite films with thicknesses up to 0.5 μm have been created with the common dip self-assembly and with the spin coating layer-by-layer assembly technique from a poly(diallyldimethylammonium)chloride (PDDA) solution and a suspension of a smectite clay mineral (Laponite). Geometrical characteristics (thickness, roughness, and texture) as well as mechanical characteristics (hardness and modulus) of the clay-polyelectrolyte films have been studied. The spin-coated nanocomposite films exhibit clearly improved mechanical properties (hardness 0.4 GPa, elastic modulus 7 GPa) compared to the “pure” polymer film, namely a sixfold increase in hardness and a 17-fold increase in Young’s modulus.

Keywords

Self-assemblyCompositePolymer
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 4 , April 2008 , pp. 1026 - 1035
Copyright
Copyright © Materials Research Society 2008

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