Gas permeation in silicon-oxide/polymer (SiOx/PET) barrier films: role of the oxide lattice, nano-defects and macro-defects

Roberts, AP, Henry, BM, Sutton, AP, Grovenor, CRM, Briggs, GAD, Miyamoto, T, Kano, A, Tsukahara, Y and Yanaka, M (2002) Gas permeation in silicon-oxide/polymer (SiOx/PET) barrier films: role of the oxide lattice, nano-defects and macro-defects. Journal of Membrane Science, 208 1-2: 75-88. doi:10.1016/S0376-7388(02)00178-3


Author Roberts, AP
Henry, BM
Sutton, AP
Grovenor, CRM
Briggs, GAD
Miyamoto, T
Kano, A
Tsukahara, Y
Yanaka, M
Title Gas permeation in silicon-oxide/polymer (SiOx/PET) barrier films: role of the oxide lattice, nano-defects and macro-defects
Journal name Journal of Membrane Science   Check publisher's open access policy
ISSN 0376-7388
Publication date 2002-01-01
Year available 2002
Sub-type Article (original research)
DOI 10.1016/S0376-7388(02)00178-3
Open Access Status Not yet assessed
Volume 208
Issue 1-2
Start page 75
End page 88
Total pages 14
Place of publication Amsterdam
Publisher ELSEVIER SCIENCE BV
Language eng
Subject C1
240201 Theoretical Physics
780102 Physical sciences
Abstract We propose a model for permeation in oxide coated gas barrier films. The model accounts for diffusion through the amorphous oxide lattice, nano-defects within the lattice, and macro-defects. The presence of nano-defects indicate the oxide layer is more similar to a nano-porous solid (such as zeolite) than silica glass with respect to permeation properties. This explains why the permeability of oxide coated polymers is much greater, and the activation energy of permeation much lower, than values expected for polymers coated with glass. We have used the model to interpret permeability and activation energies measured for the inert gases (He, Ne and Ar) in evaporated SiOx films of varying thickness (13-70 nm) coated on a polymer substrate. Atomic force and scanning electron microscopy were used to study the structure of the oxide layer. Although no defects could be detected by microscopy, the permeation data indicate that macro-defects (>1 nm), nano-defects (0.3-0.4 nm) and the lattice interstices (<0.3 nm) all contribute to the total permeation. (C) 2002 Elsevier Science B.V. All rights reserved.
Keyword Engineering, Chemical
Polymer Science
Barrier Films
Gas Permeation
Diffusion Pathways
Activation Energy
Ceramic-polymer Composites
Oriented Poly(ethylene-terephthalate)
Diffusion
Transport
Water
Oxygen
Morphology
Coatings
Q-Index Code C1
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Physical Sciences Publications
 
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Created: Wed, 15 Aug 2007, 03:05:28 EST