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首页> 外文期刊>Advanced Functional Materials >Self-Sterilized EVOH-TiO_2 Nanocomposites: Interface Effects on Biocidal Properties
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Self-Sterilized EVOH-TiO_2 Nanocomposites: Interface Effects on Biocidal Properties

机译：自灭菌EVOH-TiO_2纳米复合材料：界面对杀菌性能的影响。

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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.
机译：通过直接熔融工艺制备了广泛用于食品包装中的，通过将TiO_2掺入乙烯-乙烯醇共聚物中而获得的纳米复合材料。使用广角和小角X射线散射（WAXS / SAXS）以及振动红外和拉曼光谱学检查了纳米复合材料的结构特征。显微镜（SEM / TEM）研究表明，所获得的材料在纳米尺度上是高度均匀的，在有机和无机成分之间均表现出紧密的接触。将TiO_2掺入该聚合物基体后，在光激发后会产生自灭菌的纳米复合材料，这些材料已针对9种通常与食品污染和/或降解有关的微生物（革兰氏阳性和革兰氏阴性细菌，球菌和酵母菌）进行了测试。总体而言，纳米复合材料在杀死所有微生物方面表现出令人印象深刻的性能，其最大氧化物含量为2-5 wt％。物理化学性质的测量以及材料的结构表征提供了确凿的证据，表明纳米复合材料具有纳米有机-无机界面所固有的杀生物能力，并且可以根据TiO_2含量合理地确定最大值的存在。

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