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Effect of surface fractality on the permeability of transparent gas barrier coatings
Author(s) -
GarcfaAyuso Gema,
Salvarezza Roberto,
MartinezDuart Jos Ea M.,
Sánchez Olga,
Vázquez Luis
Publication year - 1997
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.19970090815
Subject(s) - materials science , permeation , polymer , permeability (electromagnetism) , fractal dimension , porosity , oxygen permeability , oxygen , nanostructure , chemical engineering , porous medium , composite material , nanotechnology , fractal , membrane , organic chemistry , chemistry , mathematical analysis , biochemistry , engineering , mathematics
The permeability of inorganic barrier coatings on polymers is important in applications in the flexible packaging industry, for exmaple. Relationships are reported between the film surface nanostructure, in particular the film pore surface fractality, and the permeability of water and oxygen molecules through different SiO 2 –Al 2 O 3 films. Following a brief out‐line of the various contributions to transport of gases through a porous solid, it is shown that water undergoes surface‐mediated permeation, the permeability thus varying with the surface fractal dimension D , while oxygen does not.