Premium
Self‐Sterilized EVOH‐TiO 2 Nanocomposites: Interface Effects on Biocidal Properties
Author(s) -
Cerrada Maria L.,
Serrano Cristina,
SánchezChaves Manuel,
FernándezGarcía Marta,
FernándezMartín Fernando,
de Andrés Alicia,
Riobóo Rafael J. Jiménez,
Kubacka Anna,
Ferrer Manuel,
FernándezGarcía Marcos
Publication year - 2008
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200701068
Subject(s) - materials science , nanocomposite , small angle x ray scattering , polymer , vinyl alcohol , chemical engineering , polymer nanocomposite , raman spectroscopy , copolymer , composite material , scattering , optics , physics , engineering
Nanocomposite materials obtained by TiO 2 incorporation into ethylene–vinyl alcohol copolymers, extensively used in food packaging, are prepared via a straightforward melting process. The structural characteristics of the nanocomposites are examined using wide and small angle X‐ray scattering (WAXS/SAXS), and vibrational infrared and Raman spectroscopies. A microscopy (SEM/TEM) study shows that the materials obtained are highly homogeneous at the nanometric scale, exhibiting an intimate contact between both the organic and inorganic components. TiO 2 incorporation into this polymer matrix renders self‐sterilized nanocomposite materials upon light excitation, which are tested against nine micro‐organisms (gram‐positive and gram‐negative bacteria, cocci, and yeasts) typically involved in food contamination and/or degradation. Overall, the nanocomposites display an impressive performance in the killing of all micro‐organisms with a maximum for an oxide content between 2–5 wt %. The measurement of the physico‐chemical properties together with the structural characterization of the materials provide conclusive evidence that the nanocomposites biocidal capability born of the nanometric organo‐inorganic interface and rationalize the existence of a maximum as a function of the TiO 2 content.