Design and characterization of mechanically stable, nanoporous TiO2 thin film antimicrobial coatings for food contact surfaces
Design and characterization of mechanically stable, nanoporous TiO2 thin film antimicrobial coatings for food contact surfaces
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DOI：
10.1016/j.matchemphys.2020.123001
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发表时间：
2020-09
影响因子：
4.6
通讯作者：
Eduardo Torres Dominguez;Phong H. Nguyen;A. Hylén;M. Maschmann;A. Mustapha;H. Hunt
中科院分区：
文献类型：
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作者：
Eduardo Torres Dominguez;Phong H. Nguyen;A. Hylén;M. Maschmann;A. Mustapha;H. Hunt
为了提高食品加工过程中的食品安全性，我们开发了一种二氧化钛光催化涂层，可通过溶胶-凝胶法应用于标准不锈钢食品接触表面（FCS）。这些薄的、自组装的、多孔的涂层在通过光催化过程与氧气、水和紫外线（UV）光结合使用时，有可能减少食品加工环境中的表面交叉污染。在这些条件下，涂层释放活性氧化物质（ROS），其量与涂层的光催化活性直接相关; ROS负责杀死微生物。在这项研究中，二次数学模型是用来优化合成参数之间的关系，包括溶胶-凝胶老化时间和烧结温度，以及由此产生的光催化活性的涂层。使用统计分析，预测使用223 h老化时间和507 °C烧结温度合成的涂层在实验范围内产生最大的光催化活性。我们通过实验验证了这一预测，并比较了光催化活性与光催化优化涂层的面积孔隙率之间的关系，以确定涂层的孔隙率如何影响其光催化活性。最后，为了评估实际应用，使用纳米压痕和铅笔硬度测试评估了光催化优化涂层的机械稳定性。通过定制涂层的物理化学性质以优化光催化性能和机械稳定性，我们可以为食品接触表面创建光催化涂层，这些涂层有可能防止或最大限度地减少食品加工过程中的交叉污染。
To improve food safety during food processing, we developed a titanium dioxide, photocatalytic coating that can be applied to standard stainless-steel food contact surfaces (FCS) via a sol-gel method. These thin, self-assembled, porous coatings have the potential to reduce surface cross-contamination in food processing environments when used in combination with oxygen, water, and ultraviolet (UV) light through photocatalytic processes. Under these conditions, the coating releases reactive oxidative species (ROS), the amount of which is directly related to the coating's photocatalytic activity; ROS are responsible for killing microorganisms. In this study, a quadratic mathematical model is used to optimize the relationships among synthetic parameters, including sol-gel aging time and sintering temperature, and the resulting photocatalytic activity of the coatings. Using statistical analysis, the coatings synthesized using 223 h aging time and 507 °C sintering temperatures were predicted to yield maximized photocatalytic activity within the experimental range. We verified this prediction experimentally, and compared the relationships between photocatalytic activity and the areal porosity of the photocatalytically-optimized coatings to determine how the porosity of the coatings impacted their photocatalytic activity. Lastly, in an effort to assess real-life applications, the mechanical stability of the photocatalytically-optimized coatings was evaluated using nanoindentation and pencil hardness testing. By tailoring the coatings' physicochemical properties to optimize for photocatalytic performance and mechanical stability, we can create photocatalytic coatings for food contact surfaces that have the potential to prevent or minimize cross-contamination during food processing.